镧离子插层MoS_(2)膜的制备及印染高盐水处理  

Preparation of Lanthanum ion intercalated MoS_(2) membrane for treating dyeing wastewater with high brine

作　　者：孙孟威 刘壮[1,2] 谢锐 巨晓洁[1,2] 汪伟 褚良银[1,2] SUN Mengwei;LIU Zhuang;XIE Rui;JU Xiaojie;WANG Wei;CHU Liangyin(School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan;State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学高分子材料工程国家重点实验室,四川成都610065

出　　处：《化工进展》2023年第1期346-353,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(22022810,21776182)。

摘　　要：二维材料具有独特的层状结构、稳定的物理化学性质等特点。近年来,由二维材料层层堆叠构成的二维膜在膜分离领域展示了非同凡响的应用潜力。本文采用成膜中共混方法将La^(3+)插入到MoS_(2)膜层间,利用原子力显微镜(AFM)和X射线光电子能谱仪(XPS)技术表征了MoS_(2)片层结构和成分;利用扫描电镜(SEM)和X射线衍射仪(XRD)技术表征了膜结构与层间距;通过加压过滤装置和渗透装置考察了La^(3+)-MoS_(2)膜的渗透截留性能。实验结果表明,La^(3+)插层改性后的MoS_(2)膜由于层间距增加而显著地提高了纯水通量,La^(3+)-MoS_(2)膜的纯水通量相较于MoS_(2)膜提高了约18.5倍。La^(3+)-MoS_(2)膜对分子量300~800g/mol染料表现出了基于空间位阻理论的截留作用,对金属离子(Na^(+)、K^(+)、Mg^(2+)、Ca^(2+)表现出了基于Donnan排斥理论的截留作用。重复性实验中,La^(3+)-MoS_(2)膜对Na^(+)的截留率仍能维持在95%以上,表现出了良好的性能稳定性。Two-dimensional materials have a unique layered structure and stable physical and chemical properties.Recently,two-dimensional membranes composed of layered two-dimensional materials have shown the extraordinary potential application of membrane separation.Here,La^(3+)ions were intercalated into the MoS_(2)membrane during the membrane formation by mixing MoS_(2)nanosheets and La^(3+)solution.The atomic force microscope and X-ray photoelectron spectroscopy were used to confirm the structure and composition of the MoS_(2)lamella.The structure and interlamellar spacing of the La^(3+)-MoS_(2)membrane were studied by scanning electron microscopy and X-ray diffraction spectroscopy.The permeability of the membranes was investigated by pressured filtration device and forward osmosis device.The results showed that the La^(3+)ions were successfully intercalated into the MoS_(2)membranes,resulting in the high-water flux of the La^(3+)-MoS_(2)membrane.The pure water flux of the La^(3+)-MoS_(2)membrane was 18.5 times higher than that of the blank MoS_(2)membrane.The La^(3+)-MoS_(2)membrane indicated a remarkable sieving effect for dyes with molecular weight from 400 to 800g/mol based on the steric hindrance effect.Moreover,the Na^(+),K^(+),Mg^(2+)and Ca^(2+)ions were rejected by the La^(3+)-MoS_(2)membrane due to the Donnan effect.In the repeatability experiment,the Na^(+)rejection rate of La^(3+)-MoS_(2)membrane can still be maintained at more than 95%,showing good repeatability and stability.The results provided a new method for the modification strategy of MoS_(2)membrane and the treatment of printing and dyeing wastewater.

关 键 词：二维膜 膜 分离 废水 脱盐 

分 类 号：TB381[一般工业技术—材料科学与工程]