ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x)掺杂复合纳滤膜及其水体中模拟放射性核素ReO_(4)^(−)去除研究  

Composite nanofiltration membrane doped ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x)for removal of ReO_(4)^(-)simulated radionuclide from water

作　　者：吴梦雅 刘晗翀 周平 吴礼光[1] 王挺[1] WU Mengya;LIU Hanchong;ZHOU Ping;WU Liguang;WANG Ting(School of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310012)

机构地区：[1]浙江工商大学,环境科学与工程学院,杭州310012

出　　处：《环境科学学报》2025年第3期185-194,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.22078291,21776250);浙江工商大学“数字+”学科建设管理项目(No.SZJ2022B014)。

摘　　要：高效去除水环境中的放射性核素是当前核能开发及其生态环境领域的重要课题.本文基于Ti_(3)C_(2)T_(x)的层状结构、比表面积较大、亲水性较好的特点,采用共沉淀法制备ZnFe_(2)O_(4)插层Ti_(3)C_(2)T_(x)的纳米复合物ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x),再将其添加到水相介质中通过界面聚合制备ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x)掺杂聚酰胺复合纳滤膜,用于模拟放射性废水中核素的去除.纳米复合物的结构分析显示,插层在Ti_(3)C_(2)T_(x)片层状中的ZnFe_(2)O_(4)分散均匀,ZnFe_(2)O_(4)的插层可增大Ti_(3)C_(2)T_(x)的层间距;复合纳滤膜结构和性能研究发现,ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x)的掺杂可增加复合纳滤膜的水传质通道,增强膜的亲水性和荷负电性,复合纳滤膜的水通量较未掺杂TFC膜有较大的提高,盐的截留率也略有增大;复合纳滤膜的孔径,亲水性随纳米复合物中ZnFe_(2)O_(4)/Ti_(3)C_(2)T_(x)质量比的增加而增大,但质量比增加到一定程度后,插层在Ti_(3)C_(2)T_(x)片层中的ZnFe_(2)O_(4)会发生团聚,导致复合纳滤膜的荷负电性减弱,表现为复合纳滤膜的水通量随质量比的增加持续增大,盐的截留率呈先增大后略有下降的趋势.所构建的复合纳滤膜TFN-II-8在处理模拟放射性核素废水时水通量大于25 L·m^(-2)·h^(-1),ReO_(4)^(-)的截留率高于73%,NaCl的截留率在29%左右,且具有较好的运行稳定性.Efficient removal of radioactive nuclides from water environment is an important issue in the current nuclear industry and ecological environment fields.Due to the layer structure,large specific surface area,and good hydrophilicity of Ti_(3)C_(2)T_(x),ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x)nanocomposites were fabricated by intercalating ZnFe_(2)O_(4)into the layer structure of Ti_(3)C_(2)T_(x)using co-precipitation method.Followed that,the composite nanofiltration membranes were prepared by doping ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x)to aqueous media through interfacial polymerization,for removing ReO_(4)^(-)ions from simulating radioactive wastewater.The results showed that ZnFe_(2)O_(4)was uniformly deposited in the layered Ti_(3)C_(2)T_(x),and the interlayer spacing of Ti_(3)C_(2)T_(x)increased in ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x)nanocomposites.The mass transfer channel,hydrophilicity and negative charge of the composite nanofiltration membrane enhanced with the doping ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x).The water flux of the composite nanofiltration membrane was significantly improved compared to TFC membrane,and salt rejection rate was also slightly increased.The mass ratio of ZnFe_(2)O_(4)/Ti_(3)C_(2)T_(x)is an important parameter for regulating the structure and performance of the composite nanofiltration membranes.The pore size and hydrophilicity of the composite nanofiltration membrane would increase with the mass ratio of ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x).However,at high the mass ratio of ZnFe_(2)O_(4),ZnFe_(2)O_(4)in Ti_(3)C_(2)T_(x)layer would agglomerate,which resulted in a decrease negative charge of the composite nanofiltration membrane.The water flux of the membrane continues to increase,while the rejection of salt first increases and then slightly decreases,with mass ratio of ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x).The membrane TFN-II-8 had a water flux greater than 25 L·m^(-2)·h^(-1)when treating simulated radioactive nuclide wastewater.The rejection rate of ReO_(4)^(-)was higher than 73%,and the rejection rate of NaCl was aroun

关 键 词：Ti_(3)C_(2)T_(x) ZnFe_(2)O_(4)@Ti_(3)C_(2)T_(x) 纳滤膜 ReO_(4)^(-)的去除 

分 类 号：X703[环境科学与工程—环境工程]