摘要
水资源短缺是制约社会和工业发展的关键挑战之一,二维(2D)纳米材料构筑的分离膜在水处理领域表现出潜在的应用前景,具有良好的分离性能和可调控的微结构.为了解决二维材料膜存在的制备困难和易溶胀等问题,本研究以多孔氧化铝(Al_(2)O_(3))为载体,利用真空抽滤技术引入孔径为0.34μm的改性碳纳米管(CNTs)过渡层,为膜层制备提供更多结合位点和静电结合力,在此过渡层上采用真空抽滤-热交联(180℃)技术制备出了二维MXene(Ti_(3)C_(2)T_(x))材料分离膜,尽管热交联降低了纳米通道尺寸和渗透性,但提高了抗溶胀性.所制备MX-180膜纳米通道尺寸为5.0A,在0.1至0.5 MPa压力下的纳滤测试中,MXene膜的纯水渗透量为8.3±2.5L/(m^(2)·h·MPa),对KCl、NaCl、MgCl_(2)和四环素截留率达到67.87%、79.99%、85.66%和91.34%,具有良好的分离性能和抗溶胀稳定性.
Water scarcity is one of the key challenges that limit social and industrial development.Separation membranes constructed with two-dimensional(2D)materials show promising potential in water treatment applications due to their excellent separation performance and tunable microstructure.However,there are some issues of high-quality fabrication and swelling for current 2D materials membranes.To address these issues,in this study,a modified carbon nanotubes(CNTs)interlayer(0.34μm)was introduced onto porous alumina(Al_(2)O_(3))ceramic substrates via vacuum filtration to provide more binding sites and stronger binding forces for high-quality top-layer formation.Then MXene(Ti_(3)C_(2)T_(x))membranes were fabricated on them via vacuum filtration,followed by a thermal cross-linking strategy at 180 C.Anti-swelling ability was improved,though both channel size and permeability were reduced during thermal cross-linking process.The MX-180 membrane exhibits a nanochannel size of 5.0 A,pure water permeance of 8.3±2.5 L/(m^(2)·h·MPa)under the nanofiltration test at 0.1~0.5 MPa pressure,and the rejections of 67.87%,79.99%,85.66%,91.34%for KCl,NaCl,MgCl_(2),tetracycline indicating promising separation performance and anti-swelling stability.
作者
汪波
孙阔
张岗
孙春意
王雪玲
董应超
WANG Bo;SUN Kuo;ZHANG Gang;SUN Chunyi;WANG Xueling;DONG Yingchao(Key Laboratory of Industrial Ecology and Environmental Engineering,School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China;School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2023年第5期20-27,共8页
Membrane Science and Technology
基金
国家重点研发专项(2019YFA0705803)
兴辽英才项目(XLYC1807250)
国家自然科学基金(21876020,2261160381,52070033)
企业横向课题(HX20190810)。
关键词
水处理
二维材料膜
MXene纳米通道膜
抗溶胀
脱盐
新污染物
water treatment
two-dimensional(2D)material membranes
MXene nanochannel membrane
anti-swelling
desalination
emerging contaminant
作者简介
第一作者:汪波(1998-),男,安徽六安人,硕士生,研究方向为二维纳米通道的构筑及离子分离研究;通讯作者:董应超,E-mail:ycdong@dlut.edu,cn。
