The leaching experiments of soils contaminated by heavy metal Pb or Cd were conducted with four kinds of environmental materials, polymer absorbent material （PAM）, coal-based nutrient （CBN）, mineral adsorption mat...The leaching experiments of soils contaminated by heavy metal Pb or Cd were conducted with four kinds of environmental materials, polymer absorbent material （PAM）, coal-based nutrient （CBN）, mineral adsorption material （MAM） and mineral chemical material （MCM） to explore Pb and Cd solidification effects. Then the Fourier Transform Infrared Spectrometer （FTIR） analysis was used to explain the solidification mechanism of the effective environmental materials, and the Scanning Electron Microscope （SEM） test was applied to demonstrate their solidifi- cation morphology. The results showed that MCM was the best material for Pb solidification, and Pb concentration in the leachate accounted for 68.6% of that in CK; MAM was the best material for Cd solidification, and the Cd concentration accounted for 74.6% of that in CK. The FTIR analysis showed the functional groups, such as C-OH in MCM and COOH in MAM, could explain the adsorption mechanism by ion exchange and chemical bond force. The SEM images indicated there were obvious adsorption morphological changes in MCM and MAM after adsorbing Pb and Cd respectively.展开更多
The control of carbon emissions and energy conservation,and environmental protection are hot spots of global concern.In this paper,phase change paraffin wax is applied to porous materials for adsorption and storage,an...The control of carbon emissions and energy conservation,and environmental protection are hot spots of global concern.In this paper,phase change paraffin wax is applied to porous materials for adsorption and storage,and nature’s eco-friendly materials are selected as the porous matrix to propose an eco-friendly phase change concrete using eco-friendly materials as raw materials.It was obtained that the strength of the phase change concrete utilizing environmentally friendly materials was 25.4%to 36.8%lower than that of ordinary concrete,while some of the phase change light aggregates were found to produce slip damage with the cement paste in the damage study.By constructing a small-sized test room for thermal properties,we obtained a phase change concrete that utilizes environmentally friendly materials to control the temperature better than the commonly studied phase change concrete,with a peak temperature drop of up to 2.6℃ in the phase change test room compared to the normal test room and a delay in the peak temperature.展开更多
Green material was first put forward at the first International Conference on materials in 1988, and it is regarded as one of the target materials to be realized by human beings in the next century. With the awakening...Green material was first put forward at the first International Conference on materials in 1988, and it is regarded as one of the target materials to be realized by human beings in the next century. With the awakening of people's awareness of environmental protection and the increasing attention to the safety and health performance of materials, the choice of materials and design schemes will be more inclined to the direction of environmental protection and green in interior decoration design. People no longer simply pursue the aesthetic height of interior decoration personality and the decoration design schemes that win by stacking luxury materials are no longer popular with the public, but begin to attract more attention. The natural environmental protection, safety and health performance of materials should be considered. This article mainly analyzes the application of energy saving and environmental protection green decoration materials in building decoration construction, hoping to give you some inspiration.展开更多
At present, under the background of sustainable development, the construction industry must pay attention to energy conservation and consumption reduction in construction if it wants to achieve sustainable development...At present, under the background of sustainable development, the construction industry must pay attention to energy conservation and consumption reduction in construction if it wants to achieve sustainable development. At present, the application of energy-saving green building materials in construction projects is the main way to achieve energy conservation and consumption reduction, and is an important measure to achieve sustainable development of enterprises. This paper analyzes the application status of building green materials and discusses the influence of building materials control on the construction cost, hoping to provide reference for relevant personnel and improve the economic benefits of construction projects.展开更多
Under the call of building a green ecological society, all walks of life should actively fulfill their social responsibilities and effectively apply the concept of green energy saving to the specific production and li...Under the call of building a green ecological society, all walks of life should actively fulfill their social responsibilities and effectively apply the concept of green energy saving to the specific production and living activities. Especially for the building decoration construction of the material application, construction links, resource consumption of the industry, more from the implementation of technology application, material selection will be the energy saving concept in place. Through the application of energy-saving and environmental protection materials in building decoration construction to effectively reduce the environmental burden, reflect the responsibility of enterprises. This article is on the positive role of energy saving and environmental protection materials in building decoration construction and the specific application of a simple elaboration for reference.展开更多
This article presents research focused on developing and scientifically substantiating a technology for producing environmentally friendly glued structures fromwood treated through a two-stage process.Themethodology i...This article presents research focused on developing and scientifically substantiating a technology for producing environmentally friendly glued structures fromwood treated through a two-stage process.Themethodology involves preliminary thermal modification followed by high-frequency low-temperature plasma treatment.Thermal modification enhances performance characteristics such as resistance to rot,lowers hygroscopicity,and increases dimensional stability.However,it can diminish the adhesive properties of wood,complicating the bonding process.To address this challenge,the study introduces high-frequency low-temperature plasma treatment,which activates the wood surface,improving wettability and adhesion while minimizing glue consumption.Experimental results indicate that plasma treatment reduces the contact angle by 46%and adhesive consumption during bonding by 24%,thereby enhancing the environmental friendliness of the glued structures.Furthermore,this dual treatment process increases the shear strength of adhesive joints by 22.7%and bending strength of glued beams by 66.6%,demonstrating a 30%lower carbon footprint compared to conventional methods.The findings affirm the efficacy of this technology in producing building materials,particularly glued beams for large-span structures.展开更多
By the application of life cycle assessment(LCA) methodology, this paper estimates the environmental impacts of production and disposal of traction motors used in electric vehicles in China. The results show that the ...By the application of life cycle assessment(LCA) methodology, this paper estimates the environmental impacts of production and disposal of traction motors used in electric vehicles in China. The results show that the total energy use, the criteria emissions and the greenhouse gases(GHG) emissions of a traction motor production and disposal are about 2,899,MJ, 4.5,kg and 259.5,kg per motor, respectively. Among the regulated emissions, the SOxemission ranks first by total mass, followed by CO, PM10, NOx, PM2.5, and volatile organic compound(VOC). The motor material production stage accounts for most of the energy consumption and emissions, followed by the assembly stage and the end-of-life disposal stage. In this study, the environmental performance analysis is extended to the comparison between the use of secondary material and primary material for the material production stage. It is found that using 100% secondary material results in a 52.9% reduction in energy consumption, a 49.8% reduction in regulated emissions, and a 49.3% reduction in GHG emissions compared with the use of 100% primary material.展开更多
In this paper,the main research work and related reports of materials science research in China’s space technology field during 2020-2022 are summarized.This paper covers Materials Sciences in Space Environment,Mater...In this paper,the main research work and related reports of materials science research in China’s space technology field during 2020-2022 are summarized.This paper covers Materials Sciences in Space Environment,Materials Sciences for Space Environment,Materials Behavior in Space Environment and Space experimental hardware for material investigation.With the rapid development of China’s space industry,more scientists will be involved in materials science,space technology and earth science researches.In the future,a series of disciplines such as space science,machinery,artificial intelligence,digital twin and big data will be further integrated with materials science,and space materials will also usher in new development opportunities.展开更多
The novel coronavirus,SARS-CoV-2,which has caused millions of death globally is recognized to be unstable and recalcitrant in the environment,especially in the way it has been evolving to form new and highly transmiss...The novel coronavirus,SARS-CoV-2,which has caused millions of death globally is recognized to be unstable and recalcitrant in the environment,especially in the way it has been evolving to form new and highly transmissible variants.Of particular concerns are human-environment interactions and the handling and reusing the environmental materials,such as effluents,sludge,or biosolids laden with the SARS-CoV-2 without adequate treatments,thereby suggesting potential transmission and health risks.This study assesses the prevalence of SARS-CoV-2 RNA in effluents,sludge,and biosolids.Further,we evaluate the environmental,ecological,and health risks of reusing these environmental materials by wastewater/sludge workers and farmers.A systematic review of literature from the Scopus database resulted in a total of 21 articles(11 for effluents,8 for sludge,and 2 for biosolids)that met the criteria for meta-analysis,which are then subdivided into 30 meta-analyzed studies.The prevalence of SAR-CoV-2 RNA in effluent and sludge based on random-effect models are 27.51 and 1012.25,respectively,with a 95%CI between 6.14 and 48.89 for the effluent,and 104.78 and 1019.71 for the sludge.However,the prevalence of SARS-CoV-2 RNA in the biosolids based on the fixed-effect model is 30.59,with a 95%CI between 10.10 and 51.08.The prevalence of SARS-CoV-2 RNA in environmental materials indicates the inefficiency in some of the treatment systems currently deployed to inactivate and remove the novel virus,which could be a potential health risk concern to vulnerable wastewater workers in particular,and the environmental and ecological issues for the population at large.This timely review portends the associated risks in handling and reusing environmental materials without proper and adequate treatments.展开更多
The transition toward low-carbon concrete(LCC)represents a critical pathway for decarbonizing the construction sector and achieving global net-zero targets.This study provides a comprehensive and analytical review of ...The transition toward low-carbon concrete(LCC)represents a critical pathway for decarbonizing the construction sector and achieving global net-zero targets.This study provides a comprehensive and analytical review of material innovations,digital enablers,and policy mechanisms shaping the evolution of LCC technologies.A systematic PRISMAbased review combined with bibliometric mapping(VOS viewer)was conducted across various peer-reviewed studies.The analysis integrates scientific,economic,and regulatory dimensions through an original conceptual framework linking supplementary cementitious materials(SCMs),limestone calcined clay cement(LC),geopolymers,recycled aggregates(RA),and carbon capture and utilization(CCU)with digitalization,circular economy,and life-cycle assessment.Comparative synthesis reveals that embodied-carbon reduction follows the hierarchy:Geopolymers(40–70%)>LC^(3)(30–40%)>SCM blends(25–40%)>CCU concretes(20–40%)>RA concretes(15–20%).However,economic feasibility declines with increasing binder novelty,underscoring the need for policy and carbon-pricing support.A time-bound roadmap toward Net-Zero 2050 is proposed,outlining near-,short-,medium-,and long-term milestones for R&D,standardization,infrastructure decarbonization,and technological breakthroughs.The paper concludes with prioritized research directions addressing standardization gaps,digital interoperability,and field-based durability validation.Collectively,the study advances an integrated vision where material innovation,digital intelligence,and policy alignment converge to accelerate the realization of a carbon-neutral concrete industry.展开更多
Low thermal conductivity, matched thermal expansion coefficient and good compatibility are general requirements for the environmental/thermal barrier coatings(EBCs/TBCs) and interphases for Al2O3 f/Al2O3 composites. I...Low thermal conductivity, matched thermal expansion coefficient and good compatibility are general requirements for the environmental/thermal barrier coatings(EBCs/TBCs) and interphases for Al2O3 f/Al2O3 composites. In this work, a novel high-entropy(HE) rare-earth phosphate monazite ceramic (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is designed and successfully synthesized. This new type of HE rare-earth phosphate monazite exhibits good chemical compatibility with Al2O3, without reaction with Al2O3 as high as 1600℃ in air. Moreover, the thermal expansion coefficient(TEC) of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4(8.9 × 10^-6/℃ at 300–1000℃) is close to that of Al2O3. The thermal conductivity of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 at room temperature is as low as 2.08 W·m^-1·K^-1, which is about 42% lower than that of La PO4. Good chemical compatibility, close TEC to that of Al2O3, and low thermal conductivity indicate that HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is suitable as a candidate EBC/TBC material and an interphase for Al2O3 f/Al2O3 composites.展开更多
Aerogel materials possess a wide variety of excellent functions,hence a striking number of applications have developed for them.In this paper,we present a historic review of the aerogel materials,showing the main conc...Aerogel materials possess a wide variety of excellent functions,hence a striking number of applications have developed for them.In this paper,we present a historic review of the aerogel materials,showing the main concepts,research methods,important scientific problems,formation mechanism,structure characteristics and essence of aerogel.More applications are evolving as the scientific and engineering community,which becomes familiar with the unusual and exceptional physical properties of aerogels.In addition,we also discuss the huge development potential and prospect of polysaccharide aerogels as the research trend in the future.展开更多
As a metal-free semiconductor,graphitic carbon nitride(g-C3N4)has received extensive attention due to its high stability,nontoxicity,facile and low-cost synthesis,appropriate band gap in the visible spectral range and...As a metal-free semiconductor,graphitic carbon nitride(g-C3N4)has received extensive attention due to its high stability,nontoxicity,facile and low-cost synthesis,appropriate band gap in the visible spectral range and wide availability of resources.The dimensions of g-C3N4 can influence the regime of the confinement of electrons,and consequently,g-C3N4 with various dimensionalities shows different properties,making them available for many stimulating applications.Although there are some reviews focusing on the synthesis strategy and applications of g-C3N4,there is still a lack of comprehensive review that systemically summarises the synthesis and application of different dimensions of g-C3N4,which can provide an important theoretical and practical basis for the development of g-C3N4 with different dimensionalities and maximises their potential in diverse applications.By reviewing the latest progress of g-C3N4 studies,we aim to summarise the preparation of g-C3N4 with different dimensionalities using various structural engineering strategies,discuss the fundamental bottlenecks of currently existing methods and their solution strategies,and explore their applications in energy and environmental applications.Furthermore,it also puts forward the views on the future research direction of these unique materials.展开更多
Red mud(RM)is a highly alkaline solid waste generated during alumina production.With the rapid development of the alumina industry,RM production has increased dramatically,reaching a rate of 120-150 million tons annua...Red mud(RM)is a highly alkaline solid waste generated during alumina production.With the rapid development of the alumina industry,RM production has increased dramatically,reaching a rate of 120-150 million tons annually.This substantial production leads to several issues,including the occupation of extensive land areas and the necessity for costly maintenance.Furthermore,it may cause pollution and harm to the surrounding ecological environment.Therefore,RM needs to be treated and recycled in an environmentally friendly way.Utilizing RM as an environmental remediation material effectively leverages RM resources.Red mud environmental remediation materials(RM-ERMs)are usually prepared by activating RM and synergistically using RM with other components.RM-ERMs are generally applied in three areas of environmental pollution control:wastewater purification,exhaust gas purification,and soil remediation.The use of RM-ERMs has been proven to be a promising strategy that not only removes various types of waste from the environment but also enables the effective use of bulk solid waste RM,achieving the purpose of treating waste with waste.Furthermore,exploring the current limitations of RM as an environmental remediation material provides valuable insights and suggestions for future research endeavors in this area.展开更多
Environmental barrier coating(EBC)materials that are resistant against molten calcia-magnesia-aluminosilicate(CMAS)corrosion are urgently required.Elerein,multicomponent rare-earth(RE)disilicate((Yb_(0.2)Y_(0.2)Lu_(0....Environmental barrier coating(EBC)materials that are resistant against molten calcia-magnesia-aluminosilicate(CMAS)corrosion are urgently required.Elerein,multicomponent rare-earth(RE)disilicate((Yb_(0.2)Y_(0.2)Lu_(0.2)Sc_(0.2)Gd_(0.2))_(2)Si_(2)O_(7),(5RE)_(2)Si_(2)O_(7))was investigated with regard to its CMAS interaction behavior at 1400°C.Compared with the individual RE disilicates,the(5RE)2Si2C>7 material exhibited improved resistance against CMAS attack.The dominant process involved in the interaction of(5RE)_(2)Si_(2)O_(7)with CMAS was reaction-recrystallization.A dense and continuous reaction layer protected the substrate from rapid corrosion at high temperatures.The results demonstrated that multicomponent strategy of RE species in disilicate can provide a new perspective in the development of promising EBC materials with improved corrosion resistance.展开更多
基金Supported by the National " Twelfth Five-Year" Plan for Science & Technology Support ( 2011AA100503)
文摘The leaching experiments of soils contaminated by heavy metal Pb or Cd were conducted with four kinds of environmental materials, polymer absorbent material （PAM）, coal-based nutrient （CBN）, mineral adsorption material （MAM） and mineral chemical material （MCM） to explore Pb and Cd solidification effects. Then the Fourier Transform Infrared Spectrometer （FTIR） analysis was used to explain the solidification mechanism of the effective environmental materials, and the Scanning Electron Microscope （SEM） test was applied to demonstrate their solidifi- cation morphology. The results showed that MCM was the best material for Pb solidification, and Pb concentration in the leachate accounted for 68.6% of that in CK; MAM was the best material for Cd solidification, and the Cd concentration accounted for 74.6% of that in CK. The FTIR analysis showed the functional groups, such as C-OH in MCM and COOH in MAM, could explain the adsorption mechanism by ion exchange and chemical bond force. The SEM images indicated there were obvious adsorption morphological changes in MCM and MAM after adsorbing Pb and Cd respectively.
基金Thanks to the Shandong Science and Technology Development Project(2013YD02043)and Shandong University of Science and Technology Science and Technology Innovation Program for their support.
文摘The control of carbon emissions and energy conservation,and environmental protection are hot spots of global concern.In this paper,phase change paraffin wax is applied to porous materials for adsorption and storage,and nature’s eco-friendly materials are selected as the porous matrix to propose an eco-friendly phase change concrete using eco-friendly materials as raw materials.It was obtained that the strength of the phase change concrete utilizing environmentally friendly materials was 25.4%to 36.8%lower than that of ordinary concrete,while some of the phase change light aggregates were found to produce slip damage with the cement paste in the damage study.By constructing a small-sized test room for thermal properties,we obtained a phase change concrete that utilizes environmentally friendly materials to control the temperature better than the commonly studied phase change concrete,with a peak temperature drop of up to 2.6℃ in the phase change test room compared to the normal test room and a delay in the peak temperature.
文摘Green material was first put forward at the first International Conference on materials in 1988, and it is regarded as one of the target materials to be realized by human beings in the next century. With the awakening of people's awareness of environmental protection and the increasing attention to the safety and health performance of materials, the choice of materials and design schemes will be more inclined to the direction of environmental protection and green in interior decoration design. People no longer simply pursue the aesthetic height of interior decoration personality and the decoration design schemes that win by stacking luxury materials are no longer popular with the public, but begin to attract more attention. The natural environmental protection, safety and health performance of materials should be considered. This article mainly analyzes the application of energy saving and environmental protection green decoration materials in building decoration construction, hoping to give you some inspiration.
文摘At present, under the background of sustainable development, the construction industry must pay attention to energy conservation and consumption reduction in construction if it wants to achieve sustainable development. At present, the application of energy-saving green building materials in construction projects is the main way to achieve energy conservation and consumption reduction, and is an important measure to achieve sustainable development of enterprises. This paper analyzes the application status of building green materials and discusses the influence of building materials control on the construction cost, hoping to provide reference for relevant personnel and improve the economic benefits of construction projects.
文摘Under the call of building a green ecological society, all walks of life should actively fulfill their social responsibilities and effectively apply the concept of green energy saving to the specific production and living activities. Especially for the building decoration construction of the material application, construction links, resource consumption of the industry, more from the implementation of technology application, material selection will be the energy saving concept in place. Through the application of energy-saving and environmental protection materials in building decoration construction to effectively reduce the environmental burden, reflect the responsibility of enterprises. This article is on the positive role of energy saving and environmental protection materials in building decoration construction and the specific application of a simple elaboration for reference.
基金funded by the Technostart competition,Agreement No.12-22(2-22)dated 01 February 2022.
文摘This article presents research focused on developing and scientifically substantiating a technology for producing environmentally friendly glued structures fromwood treated through a two-stage process.Themethodology involves preliminary thermal modification followed by high-frequency low-temperature plasma treatment.Thermal modification enhances performance characteristics such as resistance to rot,lowers hygroscopicity,and increases dimensional stability.However,it can diminish the adhesive properties of wood,complicating the bonding process.To address this challenge,the study introduces high-frequency low-temperature plasma treatment,which activates the wood surface,improving wettability and adhesion while minimizing glue consumption.Experimental results indicate that plasma treatment reduces the contact angle by 46%and adhesive consumption during bonding by 24%,thereby enhancing the environmental friendliness of the glued structures.Furthermore,this dual treatment process increases the shear strength of adhesive joints by 22.7%and bending strength of glued beams by 66.6%,demonstrating a 30%lower carbon footprint compared to conventional methods.The findings affirm the efficacy of this technology in producing building materials,particularly glued beams for large-span structures.
基金Supported by National High Technology Research and Development Program of China("863"Program,No.2011AA11A288)
文摘By the application of life cycle assessment(LCA) methodology, this paper estimates the environmental impacts of production and disposal of traction motors used in electric vehicles in China. The results show that the total energy use, the criteria emissions and the greenhouse gases(GHG) emissions of a traction motor production and disposal are about 2,899,MJ, 4.5,kg and 259.5,kg per motor, respectively. Among the regulated emissions, the SOxemission ranks first by total mass, followed by CO, PM10, NOx, PM2.5, and volatile organic compound(VOC). The motor material production stage accounts for most of the energy consumption and emissions, followed by the assembly stage and the end-of-life disposal stage. In this study, the environmental performance analysis is extended to the comparison between the use of secondary material and primary material for the material production stage. It is found that using 100% secondary material results in a 52.9% reduction in energy consumption, a 49.8% reduction in regulated emissions, and a 49.3% reduction in GHG emissions compared with the use of 100% primary material.
基金Supported by the National Natural Science Fundation of China(51873146)。
文摘In this paper,the main research work and related reports of materials science research in China’s space technology field during 2020-2022 are summarized.This paper covers Materials Sciences in Space Environment,Materials Sciences for Space Environment,Materials Behavior in Space Environment and Space experimental hardware for material investigation.With the rapid development of China’s space industry,more scientists will be involved in materials science,space technology and earth science researches.In the future,a series of disciplines such as space science,machinery,artificial intelligence,digital twin and big data will be further integrated with materials science,and space materials will also usher in new development opportunities.
基金funded by the Deanship of Scientific Research at King Khalid University(grant number RGP.1/7/43)。
文摘The novel coronavirus,SARS-CoV-2,which has caused millions of death globally is recognized to be unstable and recalcitrant in the environment,especially in the way it has been evolving to form new and highly transmissible variants.Of particular concerns are human-environment interactions and the handling and reusing the environmental materials,such as effluents,sludge,or biosolids laden with the SARS-CoV-2 without adequate treatments,thereby suggesting potential transmission and health risks.This study assesses the prevalence of SARS-CoV-2 RNA in effluents,sludge,and biosolids.Further,we evaluate the environmental,ecological,and health risks of reusing these environmental materials by wastewater/sludge workers and farmers.A systematic review of literature from the Scopus database resulted in a total of 21 articles(11 for effluents,8 for sludge,and 2 for biosolids)that met the criteria for meta-analysis,which are then subdivided into 30 meta-analyzed studies.The prevalence of SAR-CoV-2 RNA in effluent and sludge based on random-effect models are 27.51 and 1012.25,respectively,with a 95%CI between 6.14 and 48.89 for the effluent,and 104.78 and 1019.71 for the sludge.However,the prevalence of SARS-CoV-2 RNA in the biosolids based on the fixed-effect model is 30.59,with a 95%CI between 10.10 and 51.08.The prevalence of SARS-CoV-2 RNA in environmental materials indicates the inefficiency in some of the treatment systems currently deployed to inactivate and remove the novel virus,which could be a potential health risk concern to vulnerable wastewater workers in particular,and the environmental and ecological issues for the population at large.This timely review portends the associated risks in handling and reusing environmental materials without proper and adequate treatments.
文摘The transition toward low-carbon concrete(LCC)represents a critical pathway for decarbonizing the construction sector and achieving global net-zero targets.This study provides a comprehensive and analytical review of material innovations,digital enablers,and policy mechanisms shaping the evolution of LCC technologies.A systematic PRISMAbased review combined with bibliometric mapping(VOS viewer)was conducted across various peer-reviewed studies.The analysis integrates scientific,economic,and regulatory dimensions through an original conceptual framework linking supplementary cementitious materials(SCMs),limestone calcined clay cement(LC),geopolymers,recycled aggregates(RA),and carbon capture and utilization(CCU)with digitalization,circular economy,and life-cycle assessment.Comparative synthesis reveals that embodied-carbon reduction follows the hierarchy:Geopolymers(40–70%)>LC^(3)(30–40%)>SCM blends(25–40%)>CCU concretes(20–40%)>RA concretes(15–20%).However,economic feasibility declines with increasing binder novelty,underscoring the need for policy and carbon-pricing support.A time-bound roadmap toward Net-Zero 2050 is proposed,outlining near-,short-,medium-,and long-term milestones for R&D,standardization,infrastructure decarbonization,and technological breakthroughs.The paper concludes with prioritized research directions addressing standardization gaps,digital interoperability,and field-based durability validation.Collectively,the study advances an integrated vision where material innovation,digital intelligence,and policy alignment converge to accelerate the realization of a carbon-neutral concrete industry.
基金financially supported by the National Natural Science Foundation of China (Nos. 51672064 and U1435206)
文摘Low thermal conductivity, matched thermal expansion coefficient and good compatibility are general requirements for the environmental/thermal barrier coatings(EBCs/TBCs) and interphases for Al2O3 f/Al2O3 composites. In this work, a novel high-entropy(HE) rare-earth phosphate monazite ceramic (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is designed and successfully synthesized. This new type of HE rare-earth phosphate monazite exhibits good chemical compatibility with Al2O3, without reaction with Al2O3 as high as 1600℃ in air. Moreover, the thermal expansion coefficient(TEC) of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4(8.9 × 10^-6/℃ at 300–1000℃) is close to that of Al2O3. The thermal conductivity of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 at room temperature is as low as 2.08 W·m^-1·K^-1, which is about 42% lower than that of La PO4. Good chemical compatibility, close TEC to that of Al2O3, and low thermal conductivity indicate that HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is suitable as a candidate EBC/TBC material and an interphase for Al2O3 f/Al2O3 composites.
基金supported by the National Natural Science Foundation of China(31471704 and 31271837)Major Project of the Department of Science and Technology of Fujian Province(2013N5003)
文摘Aerogel materials possess a wide variety of excellent functions,hence a striking number of applications have developed for them.In this paper,we present a historic review of the aerogel materials,showing the main concepts,research methods,important scientific problems,formation mechanism,structure characteristics and essence of aerogel.More applications are evolving as the scientific and engineering community,which becomes familiar with the unusual and exceptional physical properties of aerogels.In addition,we also discuss the huge development potential and prospect of polysaccharide aerogels as the research trend in the future.
基金supported by an Australian Research Council(ARC)Future Fellowship(No.FT160100195)G.H.J.acknowledges the support from the Australian Research Council(ARC)Discovery Early Career Researcher Award(ARC DECRA)(Project ID:DE160100589)Q.H.acknowledges the technical support of Beijing NBET Technology Co.,Ltd.
文摘As a metal-free semiconductor,graphitic carbon nitride(g-C3N4)has received extensive attention due to its high stability,nontoxicity,facile and low-cost synthesis,appropriate band gap in the visible spectral range and wide availability of resources.The dimensions of g-C3N4 can influence the regime of the confinement of electrons,and consequently,g-C3N4 with various dimensionalities shows different properties,making them available for many stimulating applications.Although there are some reviews focusing on the synthesis strategy and applications of g-C3N4,there is still a lack of comprehensive review that systemically summarises the synthesis and application of different dimensions of g-C3N4,which can provide an important theoretical and practical basis for the development of g-C3N4 with different dimensionalities and maximises their potential in diverse applications.By reviewing the latest progress of g-C3N4 studies,we aim to summarise the preparation of g-C3N4 with different dimensionalities using various structural engineering strategies,discuss the fundamental bottlenecks of currently existing methods and their solution strategies,and explore their applications in energy and environmental applications.Furthermore,it also puts forward the views on the future research direction of these unique materials.
基金Fundamental Research Funds for the Central Universities,China(No.FRF-EYIT-23-07)National Key R&D Program of China(No.2019YFC1805002).
文摘Red mud(RM)is a highly alkaline solid waste generated during alumina production.With the rapid development of the alumina industry,RM production has increased dramatically,reaching a rate of 120-150 million tons annually.This substantial production leads to several issues,including the occupation of extensive land areas and the necessity for costly maintenance.Furthermore,it may cause pollution and harm to the surrounding ecological environment.Therefore,RM needs to be treated and recycled in an environmentally friendly way.Utilizing RM as an environmental remediation material effectively leverages RM resources.Red mud environmental remediation materials(RM-ERMs)are usually prepared by activating RM and synergistically using RM with other components.RM-ERMs are generally applied in three areas of environmental pollution control:wastewater purification,exhaust gas purification,and soil remediation.The use of RM-ERMs has been proven to be a promising strategy that not only removes various types of waste from the environment but also enables the effective use of bulk solid waste RM,achieving the purpose of treating waste with waste.Furthermore,exploring the current limitations of RM as an environmental remediation material provides valuable insights and suggestions for future research endeavors in this area.
基金supported by the National Natural Science Foundation of China(Grant Nos.51972027 and 51902260).
文摘Environmental barrier coating(EBC)materials that are resistant against molten calcia-magnesia-aluminosilicate(CMAS)corrosion are urgently required.Elerein,multicomponent rare-earth(RE)disilicate((Yb_(0.2)Y_(0.2)Lu_(0.2)Sc_(0.2)Gd_(0.2))_(2)Si_(2)O_(7),(5RE)_(2)Si_(2)O_(7))was investigated with regard to its CMAS interaction behavior at 1400°C.Compared with the individual RE disilicates,the(5RE)2Si2C>7 material exhibited improved resistance against CMAS attack.The dominant process involved in the interaction of(5RE)_(2)Si_(2)O_(7)with CMAS was reaction-recrystallization.A dense and continuous reaction layer protected the substrate from rapid corrosion at high temperatures.The results demonstrated that multicomponent strategy of RE species in disilicate can provide a new perspective in the development of promising EBC materials with improved corrosion resistance.
