Adsorption and photocatalysis are regarded as two desirable technologies for wastewater remediation,but are still unsatisfactory in removal effect,eco-friendly regeneration and facile reusability.In this study,we deve...Adsorption and photocatalysis are regarded as two desirable technologies for wastewater remediation,but are still unsatisfactory in removal effect,eco-friendly regeneration and facile reusability.In this study,we developed a composite nanofibrous membrane material with excellent removal performance for organic pollutants based on synergistic adsorption and photocatalysis.A novel boron-doped,nitrogen-deficient graphitic carbon nitride(B-C3N4)photocatalyst as well as an amphiphilic copolymer of methyl methacrylate and acrylic acid(p(MMA-AA))were synthesized respectively,and then used to modify polyethersulfone for the fabrication of composite nanofibrous membrane with improved hydrophilicity,negativelycharge property and enhanced visible light response simultaneously.Subsequently,the synergistic effect of adsorption and photocatalytic degradation for organic pollutants were identified especially and resulted in an excellent removal efficiency even superior to the combination of adsorption and photocatalytic degradation,which could be called a“1+1>2”effect.In addition,the regeneration and reusability,the purification ability for multicomponent wastewater,and the photocatalytic mechanism,were investigated and discussed systematically.In this work,we not only prepared the nanofibrous membrane with synergistic effect of adsorption and photocatalysis,but also provided a versatile approach to design dualfunctional support material to ensure the practical applications of powdery photocatalyst in wastewater treatment.展开更多
The adsorption technology has been widely applied in water remediation for contamination removal of dyes and bacteria,by virtue of the advantages of adsorption technology including high efficiency,energy conservation ...The adsorption technology has been widely applied in water remediation for contamination removal of dyes and bacteria,by virtue of the advantages of adsorption technology including high efficiency,energy conservation and ease of operation.Simultaneous removal of dyes and bacteria has been realized by some reported materials,but to achieve satisfactory adsorption amounts and rates remain an unmet goal for decades.Herein,a poly(methacrylatoethyl trimethyl ammonium chloride-co-methyl methacrylate)copolymer was synthesized,and then blended with polyethersulfone for the fabrication of nanofibrous membranes via electrospinning for the use of fast and massive removal of dyes and bacteria.Owing to the introduction of abundant quaternary ammonium groups,the maximum adsorption amount for methyl orange was up to 909.8 mg g^(-1).In addition,the modified nanofibrous membranes showed good recyclability,broad applications in severe environments,selective adsorption ability,and excellent dynamic removal performance.Especially,thanks to the abundant functional groups,the membranes showed fast adsorption ability for bacteria through electrostatic interaction.It should be noted that the clearance ratio for Staphylococcus aureus or Escherichia coli by 6 min of static adsorption could reach 93%or 90%for each.Additionally,dynamic removal ratio via filtration with the nanofibrous membranes could reach 99.7%for Staphylococcus aureus or 98.7%for Escherichia coli in 90 s.Therefore,the proposed approach towards the quaternary ammonium modified polyethersulfone nanofibrous membranes creates a new route for ultra-high adsorption capacity and ultra-fast removal rates for dyes and bacteria in water remediation.展开更多
太阳能界面海水淡化无需复杂的基础设施和额外的能源消耗,是一种解决全球淡水危机的有效方法.尽管现在已经开发了许多的太阳能蒸发器,但大多采用了不可持续的合成材料或(且)难以进行精确的微观结构定制,这使得其海水淡化应用的可持续性...太阳能界面海水淡化无需复杂的基础设施和额外的能源消耗,是一种解决全球淡水危机的有效方法.尽管现在已经开发了许多的太阳能蒸发器,但大多采用了不可持续的合成材料或(且)难以进行精确的微观结构定制,这使得其海水淡化应用的可持续性和性能的进一步提升受到了限制.为了解决这些问题,本文采用了两种天然分子(单宁酸和铁离子),构筑了一种轻质价廉、功能性好的界面海水淡化蒸发器.通过3D打印技术,本研究可以轻松地制备表面具有不同高度锥形阵列结构的蒸发器.该结构可以让照射到蒸发器表面的光发生多重反射,进而增加光吸收,提升光热效率,从而使其海水淡化性能进一步提升,最终在1标准太阳光下实现了1.96 kg m–2h–1的蒸发速率和94.4%的蒸发效率.此外,该蒸发器还具有优异的抗盐性能、重复利用稳定性、抗油污性能及吸附有机染料的能力,可以作为一种绿色、环保、高效的多功能水处理器件.展开更多
基金the National Natural Science Foundation of China(Nos.52003179 and 52073190)。
文摘Adsorption and photocatalysis are regarded as two desirable technologies for wastewater remediation,but are still unsatisfactory in removal effect,eco-friendly regeneration and facile reusability.In this study,we developed a composite nanofibrous membrane material with excellent removal performance for organic pollutants based on synergistic adsorption and photocatalysis.A novel boron-doped,nitrogen-deficient graphitic carbon nitride(B-C3N4)photocatalyst as well as an amphiphilic copolymer of methyl methacrylate and acrylic acid(p(MMA-AA))were synthesized respectively,and then used to modify polyethersulfone for the fabrication of composite nanofibrous membrane with improved hydrophilicity,negativelycharge property and enhanced visible light response simultaneously.Subsequently,the synergistic effect of adsorption and photocatalytic degradation for organic pollutants were identified especially and resulted in an excellent removal efficiency even superior to the combination of adsorption and photocatalytic degradation,which could be called a“1+1>2”effect.In addition,the regeneration and reusability,the purification ability for multicomponent wastewater,and the photocatalytic mechanism,were investigated and discussed systematically.In this work,we not only prepared the nanofibrous membrane with synergistic effect of adsorption and photocatalysis,but also provided a versatile approach to design dualfunctional support material to ensure the practical applications of powdery photocatalyst in wastewater treatment.
基金the National Natural Science Foundation of China(Nos.51773127,51873115,51803131 and 51803134)the State Key Research Development Programme of China(Nos.2016YFC1103000 and 2018YFC1106400)the Science and Technology Program of Sichuan Province(Nos.2017SZ0011 and 2019YJ0132)。
文摘The adsorption technology has been widely applied in water remediation for contamination removal of dyes and bacteria,by virtue of the advantages of adsorption technology including high efficiency,energy conservation and ease of operation.Simultaneous removal of dyes and bacteria has been realized by some reported materials,but to achieve satisfactory adsorption amounts and rates remain an unmet goal for decades.Herein,a poly(methacrylatoethyl trimethyl ammonium chloride-co-methyl methacrylate)copolymer was synthesized,and then blended with polyethersulfone for the fabrication of nanofibrous membranes via electrospinning for the use of fast and massive removal of dyes and bacteria.Owing to the introduction of abundant quaternary ammonium groups,the maximum adsorption amount for methyl orange was up to 909.8 mg g^(-1).In addition,the modified nanofibrous membranes showed good recyclability,broad applications in severe environments,selective adsorption ability,and excellent dynamic removal performance.Especially,thanks to the abundant functional groups,the membranes showed fast adsorption ability for bacteria through electrostatic interaction.It should be noted that the clearance ratio for Staphylococcus aureus or Escherichia coli by 6 min of static adsorption could reach 93%or 90%for each.Additionally,dynamic removal ratio via filtration with the nanofibrous membranes could reach 99.7%for Staphylococcus aureus or 98.7%for Escherichia coli in 90 s.Therefore,the proposed approach towards the quaternary ammonium modified polyethersulfone nanofibrous membranes creates a new route for ultra-high adsorption capacity and ultra-fast removal rates for dyes and bacteria in water remediation.
基金supported by the National Natural Science Foundation of China(21975167,52225311,and 52003179)the Fundamental Research Funds for Central Universities。
文摘太阳能界面海水淡化无需复杂的基础设施和额外的能源消耗,是一种解决全球淡水危机的有效方法.尽管现在已经开发了许多的太阳能蒸发器,但大多采用了不可持续的合成材料或(且)难以进行精确的微观结构定制,这使得其海水淡化应用的可持续性和性能的进一步提升受到了限制.为了解决这些问题,本文采用了两种天然分子(单宁酸和铁离子),构筑了一种轻质价廉、功能性好的界面海水淡化蒸发器.通过3D打印技术,本研究可以轻松地制备表面具有不同高度锥形阵列结构的蒸发器.该结构可以让照射到蒸发器表面的光发生多重反射,进而增加光吸收,提升光热效率,从而使其海水淡化性能进一步提升,最终在1标准太阳光下实现了1.96 kg m–2h–1的蒸发速率和94.4%的蒸发效率.此外,该蒸发器还具有优异的抗盐性能、重复利用稳定性、抗油污性能及吸附有机染料的能力,可以作为一种绿色、环保、高效的多功能水处理器件.
