The use of linear amphiphilic block copolymers as templates is an important method for the preparation of mesoporous materials.However,the obtained assemblies are usually sensitive to synthetic conditions,which impede...The use of linear amphiphilic block copolymers as templates is an important method for the preparation of mesoporous materials.However,the obtained assemblies are usually sensitive to synthetic conditions,which impedes the preparation of such mesoporous materials in certain environments.Herein,we report a universal strategy applying an amphiphilic multiarm triblock copolymer in the preparation of mesoporous metal oxide nanofibers(NFs)using one metal oxide(TiO_(2),ZrO_(2),WO_(3),CeO_(2)),or two(TiO_(2)/WO 3,TiO_(2)/ZrO_(2),TiO_(2)/CeO_(2))and three(TiO_(2)/WO_(3)/CuO)metal oxides as composites.The template consists of modified β-cyclodextrin as the center of the macromolecule which is attached sequentially to a block of polystyrene,poly(acrylic acid),and poly(ethylene oxide).Under electrospinning conditions,stable unimolecular micelles are formed and effectively co-assemble with metal ions to form fibrous nanostructures.As indicated by various characterization methods,the synthesized TiO_(2) and its derived composite NFs maintain a straight and continuous fibrous structure after calcination,and TiO_(2) NFs exhibit uniform mesopores of 10.8 nm in diameter and a large Brunauer-Emmett-Teller surface area of 143.3 m^(2)g^(−1).Benefiting from the characteristic structure,still present after modification,Pt-decorated mesoporous TiO_(2) NFs display excellent ability in the visible-light photocatalytic degradation of tetracycline,which is superior to the commercial P25 catalyst.This study reveals a promising strategy for the preparation of fibrous mesoporous metal oxides.展开更多
基金funded by the National Natural Science Foundation of China(Grants No.51822202,52173233 and 51772050)Innovation Program of Shanghai Municipal Education Commission(Grant No.2021-01-07-00-03-E00109)+8 种基金Science and Technology Commission of Shanghai Municipality(Grant No.19520713200)Shanghai Scientific and Technological Innovation Project(Grant No.19JC1410400)“Shuguang Program”supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(Grant No.20SG33)Key Basic Research Program of Science and Technology Com-mission of Shanghai Municipality(Grant No.20JC1415300)DHU Distinguished Young Professor Program and Fundamental Research Funds for the Central Universitiesthe Fundamental Research Funds for the Central Universities(Grant No.2232020D-02)Shanghai Sailing program(Grant No.20YF1400500)Shanghai Natural Science Foundation(Grant No.20ZR1401500)the Opening Project of Key Laboratory of Inorganic Functional Materials and Devices,Chinese Academy of Sciences(KLIFMD202104).
文摘The use of linear amphiphilic block copolymers as templates is an important method for the preparation of mesoporous materials.However,the obtained assemblies are usually sensitive to synthetic conditions,which impedes the preparation of such mesoporous materials in certain environments.Herein,we report a universal strategy applying an amphiphilic multiarm triblock copolymer in the preparation of mesoporous metal oxide nanofibers(NFs)using one metal oxide(TiO_(2),ZrO_(2),WO_(3),CeO_(2)),or two(TiO_(2)/WO 3,TiO_(2)/ZrO_(2),TiO_(2)/CeO_(2))and three(TiO_(2)/WO_(3)/CuO)metal oxides as composites.The template consists of modified β-cyclodextrin as the center of the macromolecule which is attached sequentially to a block of polystyrene,poly(acrylic acid),and poly(ethylene oxide).Under electrospinning conditions,stable unimolecular micelles are formed and effectively co-assemble with metal ions to form fibrous nanostructures.As indicated by various characterization methods,the synthesized TiO_(2) and its derived composite NFs maintain a straight and continuous fibrous structure after calcination,and TiO_(2) NFs exhibit uniform mesopores of 10.8 nm in diameter and a large Brunauer-Emmett-Teller surface area of 143.3 m^(2)g^(−1).Benefiting from the characteristic structure,still present after modification,Pt-decorated mesoporous TiO_(2) NFs display excellent ability in the visible-light photocatalytic degradation of tetracycline,which is superior to the commercial P25 catalyst.This study reveals a promising strategy for the preparation of fibrous mesoporous metal oxides.
基金supported by the Innovation Program of Shanghai Municipal Education Commission(2021-01-0700-03-E00109)the National Natural Science Foundation of China(51822202 and 51772050)+9 种基金the Science and Technology Commission of Shanghai Municipality(19520713200)Shanghai Sailing Program(20YF1400500)Shanghai Rising-Star Program(18QA1400100)the Key Basic Research Program of Science and Technology Commission of Shanghai Municipality(20JC1415300)Shanghai Natural Science Foundation(20ZR1401500)Shanghai Scientific and Technological Innovation Project(19JC1410400)the Fundamental Research Funds for the Central Universities(2232020D-02)the Youth Top-notch Talent Support Program of ShanghaiDHU Distinguished Young Professor Programfinancial support from Australian Research Council through an ARC Future Fellowship(FT180100387).
文摘利用胶束的一维(1D)定向组装来构建管状或纤维状的介孔材料具有重要的科学意义,但仍面临巨大挑战.本文中,我们提出了一种简单、普适的合成策略,通过静电纺丝产生的束流限域有机-无机复合胶束使其沿着1D方向组装,从而构建一系列双介孔金属氧化物纳米纤维(如WO_(3),WO_(3)/Pd,WO_(3)/Pd Cu,TiO_(2)和ZrO_(2)).这种方法主要依赖于共聚物@金属络合物复合胶束在各向异性溶液中的形成,然后通过溶剂的选择诱导使它们在束流中定向组装.以WO_(3)及其衍生物为例,所得到WO_(3)纤维显示出均一的连续纤维结构,具有双介孔尺寸(~4.0和7.6 n m)和较大的比表面积(~93.1 m^(2)g^(-1)).将钯修饰的介孔WO_(3)纳米纤维用于乙苯气体传感器,展现出了优异的综合传感性能,如高灵敏度(52.5)、超低浓度检测限(50 ppb)、快速的响应/恢复动力学(11/16 s)和优异的选择性,在环境快速监测方面显示了广阔的应用前景.
