A new burgeoning family of two-dimensional(2D)transition metal carbides/nitrides,better known as MXenes,have received extensive attention because of their distinct properties,such as metallic conductivity,good hydroph...A new burgeoning family of two-dimensional(2D)transition metal carbides/nitrides,better known as MXenes,have received extensive attention because of their distinct properties,such as metallic conductivity,good hydrophilicity,large surface area,good mechanical stability,and biodegradability.About 40 different MXenes have been synthesized,and dozens more structures and properties have been theoretically predicted.However,the recent progress in MXenes development is not well covered in chronological order based on different applications.This review article focuses on emerging synthesis methods,the properties of MXenes,and mainly the applications of MXenes and MXene-based material family in environmental remediation,a comprehensive review of gaseous and aqueous pollutants treatment.展开更多
Confronting the severe health threats and environmental impacts of Cr(Ⅵ) in aquatic environments demands innovative and effective remediation approaches. In this study, Graphene oxide(GO)-decorated poly(dimethyl amin...Confronting the severe health threats and environmental impacts of Cr(Ⅵ) in aquatic environments demands innovative and effective remediation approaches. In this study, Graphene oxide(GO)-decorated poly(dimethyl amino ethyl methacrylate)(PDMAEMA) brush nanocomposites(GOP1, GOP2, GOP3, and GOP4) were fabricated using atom transfer radical polymerization(ATRP) by the “graft from” method.The resulting nanocomposites were utilized for removing Cr(Ⅵ) with good adsorption performance due to the electrostatic interaction of protonated nitrogen groups in the brush chains with negatively charged particles in the solution. The kinetic model of pseudo-second-order best represented the contaminants' adsorption characteristics. The Weber-Morris model further indicated that surface adsorption and intraparticle diffusion mechanisms primarily controlled the adsorption procedure. Additionally, the Langmuir and Temkin isotherm models were found to most accurately represent the adsorption characteristics of the pollutants on the nanocomposites, and GOP4 can achieve the maximum adsorption capacity of 164.4 mg·g^(-1). The adsorbents' capacity maintains above 85% after five cycles of adsorption-desorption. The nanocomposites in this study demonstrate promising potential for eliminating Cr(Ⅵ) from aqueous solutions.展开更多
Aside from being essential for human needs,water resources are also in demand by various industries to ensure the sustainability of economic development in countries.However,the supply of clean and affordable water is...Aside from being essential for human needs,water resources are also in demand by various industries to ensure the sustainability of economic development in countries.However,the supply of clean and affordable water is slowly depleting to the point where it becomes a major issue that requires significant attention.The membrane filtration system is an effective method for purifying water,with a high potential to provide clean water with minimal energy.The membrane spacer is a significant component in the membrane filtration system that considerably influences its performance.The dominant challenge in membrane spacers is fouling,mainly biofouling,which leads to unwanted consequences that drastically decrease the system’s performance.This review focuses on the advancements in membrane spacer technology through the modification of geometric design,selection of materials,and evaluation of their impact on fluid dynamics and biofouling.Additionally,the review provides insight into the utilization of three-dimensional printing methods and three-dimensional simulations in advancing membrane spacer technology.展开更多
基金made possible by FRGS/1/2021/TK0/UKM/02/41 grant from Universiti Kebangsaan Malaysia。
文摘A new burgeoning family of two-dimensional(2D)transition metal carbides/nitrides,better known as MXenes,have received extensive attention because of their distinct properties,such as metallic conductivity,good hydrophilicity,large surface area,good mechanical stability,and biodegradability.About 40 different MXenes have been synthesized,and dozens more structures and properties have been theoretically predicted.However,the recent progress in MXenes development is not well covered in chronological order based on different applications.This review article focuses on emerging synthesis methods,the properties of MXenes,and mainly the applications of MXenes and MXene-based material family in environmental remediation,a comprehensive review of gaseous and aqueous pollutants treatment.
基金the Qatar National Research Fund for funding this work through NPRP(10-0127-170270,acknowledged under the grant code KK-2018-008).
文摘Confronting the severe health threats and environmental impacts of Cr(Ⅵ) in aquatic environments demands innovative and effective remediation approaches. In this study, Graphene oxide(GO)-decorated poly(dimethyl amino ethyl methacrylate)(PDMAEMA) brush nanocomposites(GOP1, GOP2, GOP3, and GOP4) were fabricated using atom transfer radical polymerization(ATRP) by the “graft from” method.The resulting nanocomposites were utilized for removing Cr(Ⅵ) with good adsorption performance due to the electrostatic interaction of protonated nitrogen groups in the brush chains with negatively charged particles in the solution. The kinetic model of pseudo-second-order best represented the contaminants' adsorption characteristics. The Weber-Morris model further indicated that surface adsorption and intraparticle diffusion mechanisms primarily controlled the adsorption procedure. Additionally, the Langmuir and Temkin isotherm models were found to most accurately represent the adsorption characteristics of the pollutants on the nanocomposites, and GOP4 can achieve the maximum adsorption capacity of 164.4 mg·g^(-1). The adsorbents' capacity maintains above 85% after five cycles of adsorption-desorption. The nanocomposites in this study demonstrate promising potential for eliminating Cr(Ⅵ) from aqueous solutions.
基金funding provided by the Ministry of Higher Education Malaysia through the Fundamental Research Grant Scheme(FRGS/1/2021/TK0/UKM/02/41).
文摘Aside from being essential for human needs,water resources are also in demand by various industries to ensure the sustainability of economic development in countries.However,the supply of clean and affordable water is slowly depleting to the point where it becomes a major issue that requires significant attention.The membrane filtration system is an effective method for purifying water,with a high potential to provide clean water with minimal energy.The membrane spacer is a significant component in the membrane filtration system that considerably influences its performance.The dominant challenge in membrane spacers is fouling,mainly biofouling,which leads to unwanted consequences that drastically decrease the system’s performance.This review focuses on the advancements in membrane spacer technology through the modification of geometric design,selection of materials,and evaluation of their impact on fluid dynamics and biofouling.Additionally,the review provides insight into the utilization of three-dimensional printing methods and three-dimensional simulations in advancing membrane spacer technology.
