To achieve the sustainable development and carbon neutral target,biomass chitosan(CS)was used to prepare N,S-doped biochar(NSB)with the assistance of sodium dodecyl benzene sulfonate(SDBS).The synthetic route was deve...To achieve the sustainable development and carbon neutral target,biomass chitosan(CS)was used to prepare N,S-doped biochar(NSB)with the assistance of sodium dodecyl benzene sulfonate(SDBS).The synthetic route was developed,which does not require the activation that is frequently-used for active carbon materials.By manipulating their interaction,SDBS was deposited with CS in neutral and basic conditions.Subsequent calcination successfully has access to NSB.It features with hierarchical porous structure and abundant functional groups.The dually-doped NSB bears excellent adsorption performance towards chlortetracycline(CTC).The adsorption capacity reaches 101.3 mg g^(-1) within 4 h.It is 200%higher than that of N-doped biochar(NB)prepared by only CS.The renewable and cost-effective raw materials and simple preparation method would enable NSB to be a good candidate for remedying antibiotics in the environment.展开更多
Cerium dioxide(CeO_(2))is a significant rare earth oxide with the merits of rich oxygen defects,specific4f^(1)5d^(1)orbitals,and superior oxygen storage-release capacity in Ce^(4+)/Ce^(3+)reversibility pairs,and has b...Cerium dioxide(CeO_(2))is a significant rare earth oxide with the merits of rich oxygen defects,specific4f^(1)5d^(1)orbitals,and superior oxygen storage-release capacity in Ce^(4+)/Ce^(3+)reversibility pairs,and has been widely investigated as an active photocatalytic material for air pollution remediation.To enhance the photocatalytic efficiency of CeO_(2),recent developments of numerous modification strategies have been employed to broaden the light absorption range and reduce the recombination rate of electron-hole pairs.This review summarizes the fabrication of modified CeO_(2)catalysts,including metal or nonmetal doping,heterostructure construction and oxygen vacancy manufacturing,to provide insight into how those advanced techniques improve the photocatalytic activity.Moreover,this work provides a detailed discussion on the usage of modified CeO_(2)in the fields of air pollution control,including nitrogen oxides removal,volatile organic compounds elimination and the purification of carbon dioxide.Finally,the potential future development and further research on the modification of CeO_(2)has been identified.展开更多
The resection of malignant osteosarcoma often results in large segmental bone defects,and the residual cells can facilitate recurrence.Consequently,the treatment of osteosarcoma is a major challenge in clinical practi...The resection of malignant osteosarcoma often results in large segmental bone defects,and the residual cells can facilitate recurrence.Consequently,the treatment of osteosarcoma is a major challenge in clinical practice.The ideal goal of treatment for osteosarcoma is to eliminate it thoroughly,and repair the resultant bone defects as well as avoid bacterial infections.Herein,we fabricated a selenium/strontium/zinc-doped hydroxyapatite(Se/Sr/Zn-HA)powder by hydrothermal method,and then employed it with polycaprolactone(PCL)as ink to construct composite scaffolds through 3D printing,and finally introduced them in bone defect repair induced by malignant osteosarcoma.The resultant composite scaffolds integrated multiple functions involving anti-tumor,osteogenic,and antibacterial potentials,mainly attributed to the anti-tumor effects of SeO_(3)^(2-),osteogenic ef-fects of Sr^(2+)and Zn^(2+),and antibacterial effects of SeO_(3)^(2-)and Zn^(2+).In vitro studies confirmed that Se/Sr/Zn-HA leaching solution could induce apoptosis of osteosarcoma cells,differentiation of MSCs,and proliferation of MC3T3-E1 while showing excellent antibacterial properties.In vivo tests demonstrated that Se/Sr/Zn-HA could significantly suppress tumors after 8 days of injection,and the Se/Sr/Zn-HA-PCLs scaffold repaired femoral defects effectively after 3 months of implantation.Summarily,the Se/Sr/Zn-HA-PCLs composite scaffolds developed in this study were effective for tumor treatment,bone defect repair,and post-operative anti-infection,which provided a great potential to be a facile therapeutic material for osteosarcoma resection.展开更多
Using the plane wave ultrasoft pseudopotential method based on the first-principles density functional theory(DFT),the influence on the electronic structure and dehydrogenation properties of VH2 doped with Zr,Cu and Z...Using the plane wave ultrasoft pseudopotential method based on the first-principles density functional theory(DFT),the influence on the electronic structure and dehydrogenation properties of VH2 doped with Zr,Cu and Zn has been studied.The results show that the negative heat of formation increases and the valence electron number at the Fermi level EF,N(EF) decreases in the Zr-doped model,indicating the higher stability of VH2 after Zr alloying.On the other hand,the negative heat of formation of VH2 decreases and the N(EF) increases in Cu-or Zn-doped systems,suggesting the lower stability of VH2 after Cu or Zn alloying.The calculated overlap populations and electron densities of the V-H bond demonstrate that the bonding is strengthened by Zr doping and weakened by Cu or Zn doping.The results predict that the maximum capacity to absorb and desorb hydrogen can be raised by the introduction of Zr and reduced by the introduction of Cu or Zn,while the dehydrogenation properties will be poorer in Zr-doped systems and enhanced in Cu-or Zn-doped systems.These predictions are consistent with the experimental results.Mulliken populations were also calculated and it was found that the Mulliken population of the V 3d orbitals decreased as a result of Zr doping,and increased after Cu or Zn doping.展开更多
基金supported by the National Natural Science Foundation of China(22276046).
文摘To achieve the sustainable development and carbon neutral target,biomass chitosan(CS)was used to prepare N,S-doped biochar(NSB)with the assistance of sodium dodecyl benzene sulfonate(SDBS).The synthetic route was developed,which does not require the activation that is frequently-used for active carbon materials.By manipulating their interaction,SDBS was deposited with CS in neutral and basic conditions.Subsequent calcination successfully has access to NSB.It features with hierarchical porous structure and abundant functional groups.The dually-doped NSB bears excellent adsorption performance towards chlortetracycline(CTC).The adsorption capacity reaches 101.3 mg g^(-1) within 4 h.It is 200%higher than that of N-doped biochar(NB)prepared by only CS.The renewable and cost-effective raw materials and simple preparation method would enable NSB to be a good candidate for remedying antibiotics in the environment.
基金financially supported by the National Key Research and Development Program of China(Nos.2022YFB3504100 and 2021YFB3500600)Jiangsu International Cooperation Project(No.BZ2021018)+5 种基金Key R&D Program of Jiangsu Province(No.BE2022142)Nanjing Science and Technology Top Experts Gathering PlanCooperation Foundation for the Chunhui Plan Program of Ministry of Education of China(No.202200554)Open Project Program of Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science(No.M2024-7)MOE,Open Project Program of Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation(No.PSMER2023008)the Open Foundation of State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control(No.SEMPC2023004)。
文摘Cerium dioxide(CeO_(2))is a significant rare earth oxide with the merits of rich oxygen defects,specific4f^(1)5d^(1)orbitals,and superior oxygen storage-release capacity in Ce^(4+)/Ce^(3+)reversibility pairs,and has been widely investigated as an active photocatalytic material for air pollution remediation.To enhance the photocatalytic efficiency of CeO_(2),recent developments of numerous modification strategies have been employed to broaden the light absorption range and reduce the recombination rate of electron-hole pairs.This review summarizes the fabrication of modified CeO_(2)catalysts,including metal or nonmetal doping,heterostructure construction and oxygen vacancy manufacturing,to provide insight into how those advanced techniques improve the photocatalytic activity.Moreover,this work provides a detailed discussion on the usage of modified CeO_(2)in the fields of air pollution control,including nitrogen oxides removal,volatile organic compounds elimination and the purification of carbon dioxide.Finally,the potential future development and further research on the modification of CeO_(2)has been identified.
基金supported by the National Natural Science Foundation of China(52071277,21802009)Jiangsu Provincial Key Research and Development Program(CN)(BE2019608)+4 种基金China Postdoctoral Science Foundation(2022M721685)Jiangsu Health Commission Medical Research Program(2020158)National Facility for Translational Med-icine(Shanghai)Open Program(TMSK-2021-304)2020 Nanjing In-ternational Science and Technology Cooperation ProgramNanjing Medical Science and Technology Development Key Program(ZKX18041).
文摘The resection of malignant osteosarcoma often results in large segmental bone defects,and the residual cells can facilitate recurrence.Consequently,the treatment of osteosarcoma is a major challenge in clinical practice.The ideal goal of treatment for osteosarcoma is to eliminate it thoroughly,and repair the resultant bone defects as well as avoid bacterial infections.Herein,we fabricated a selenium/strontium/zinc-doped hydroxyapatite(Se/Sr/Zn-HA)powder by hydrothermal method,and then employed it with polycaprolactone(PCL)as ink to construct composite scaffolds through 3D printing,and finally introduced them in bone defect repair induced by malignant osteosarcoma.The resultant composite scaffolds integrated multiple functions involving anti-tumor,osteogenic,and antibacterial potentials,mainly attributed to the anti-tumor effects of SeO_(3)^(2-),osteogenic ef-fects of Sr^(2+)and Zn^(2+),and antibacterial effects of SeO_(3)^(2-)and Zn^(2+).In vitro studies confirmed that Se/Sr/Zn-HA leaching solution could induce apoptosis of osteosarcoma cells,differentiation of MSCs,and proliferation of MC3T3-E1 while showing excellent antibacterial properties.In vivo tests demonstrated that Se/Sr/Zn-HA could significantly suppress tumors after 8 days of injection,and the Se/Sr/Zn-HA-PCLs scaffold repaired femoral defects effectively after 3 months of implantation.Summarily,the Se/Sr/Zn-HA-PCLs composite scaffolds developed in this study were effective for tumor treatment,bone defect repair,and post-operative anti-infection,which provided a great potential to be a facile therapeutic material for osteosarcoma resection.
基金supported by the National Natural Science Foundation of China (20971132)the Natural Science Foundation of Chongqing City (CSTC2009BB4243)the Foundation of Chongqing Municipal Education Commission (KJ090810,KJ070809)
文摘Using the plane wave ultrasoft pseudopotential method based on the first-principles density functional theory(DFT),the influence on the electronic structure and dehydrogenation properties of VH2 doped with Zr,Cu and Zn has been studied.The results show that the negative heat of formation increases and the valence electron number at the Fermi level EF,N(EF) decreases in the Zr-doped model,indicating the higher stability of VH2 after Zr alloying.On the other hand,the negative heat of formation of VH2 decreases and the N(EF) increases in Cu-or Zn-doped systems,suggesting the lower stability of VH2 after Cu or Zn alloying.The calculated overlap populations and electron densities of the V-H bond demonstrate that the bonding is strengthened by Zr doping and weakened by Cu or Zn doping.The results predict that the maximum capacity to absorb and desorb hydrogen can be raised by the introduction of Zr and reduced by the introduction of Cu or Zn,while the dehydrogenation properties will be poorer in Zr-doped systems and enhanced in Cu-or Zn-doped systems.These predictions are consistent with the experimental results.Mulliken populations were also calculated and it was found that the Mulliken population of the V 3d orbitals decreased as a result of Zr doping,and increased after Cu or Zn doping.
