T型沸石膜的制备及其脱盐性能研究  

Preparation of zeolite-T membrane and study on its desalination property

作　　者：付文敬 鲁金明[1] 杨建华 FU Wen-jing;LU Jin-ming;YANG Jian-hua(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024

出　　处：《现代化工》2022年第3期133-137,143,共6页Modern Chemical Industry

基　　金：国家自然科学基金(21776032)。

摘　　要：以2μm和600 nm的T型沸石为晶种,采用二次生长法制备T型沸石膜,利用XRD和SEM对T型沸石膜的晶相结构、膜层形貌进行表征,并在348 K下将其用于渗透蒸发分离35 g/L氯化钠溶液。结果表明,在423 K下晶化反应4 h,T型沸石晶体交互生长形成致密的T型沸石膜,膜层厚度约4μm,渗透蒸发脱盐测试渗透通量可以稳定在7.5 kg/(m^(2)·h),离子截留率大于99.9%;制备的T型沸石膜渗透蒸发脱盐性能优异,有重要的海水脱盐工业应用价值。Zeolite-T membrane is prepared through a secondary growth method with different sizes(2μm and 600 nm)of zeolite-T as crystal seed.The crystal phase structure and surface morphology of the fabricated zeolite-T membrane are characterized by XRD and SEM.The zeolite-T membrane is used to separate 35 g·L^(-1) NaCl solution through pervaporation at 348 K.It is found that the dense membranes with an approximate thickness of 4μm is formed through interactive growth of zeolite-T crystals at 423 K in 4 h.As these membranes are further applied to explore pervaporation desalination of 35 g·L^(-1) NaCl solution at 348 K,the water flux can remain stable at 7.5 kg/(m^(2)·h)and the rejection rate of ions can exceed 99.9%.It is demonstrated that the fabricated membrane has excellent performance in pervaporation and desalination,with high industrial application value in desalination of sea water.

关 键 词：T型沸石膜 渗透蒸发 脱盐 稳定性 二次生长法 

分 类 号：TQ028.8[化学工程]