氨基化MCM-41介孔分子筛改性超滤膜去除水中Cr(Ⅵ)的研究  

Removal of Cr(Ⅵ) From Aqueous Solution by Amine-Functionalized MCM-41 Modified Ultrafiltration Membrane

作　　者：包一翔 谢小妮[2] 周佳璐[1] 晏晓敏[1] 李来胜[1] 

机构地区：[1]华南师范大学化学与环境学院,广州510006 [2]广州大学土木工程学院,广州510006

出　　处：《华南师范大学学报（自然科学版）》2015年第6期58-62,共5页Journal of South China Normal University(Natural Science Edition)

基　　金：国家水体污染控制与治理科技重大专项项目(2012ZX07206003)

摘　　要：采用氨基化MCM-41介孔分子筛(NH2-MCM-41)接枝改性聚偏氟乙烯(PVDF)超滤膜,并用于去除水中重金属Cr(VI)研究.NH2-MCM-41成功接枝于超滤膜表面,并在表面形成均匀的亲水层,显著提高了膜的抗污染性能,过水通量衰减率从51.4%降低到24.8%.在p H 3.5,初始质量浓度20 mg/L时,改性超滤膜对Cr(VI)的吸附在5min达到快速平衡,吸附容量达到2.8 mg/g.超滤实验表明,NH2-MCM-41改性超滤膜对低质量浓度Cr(VI)进水可实现进一步净化,超滤运行时长11 h,出水Cr(VI)质量浓度始终维持低于0.5 mg/L,可有效提升膜的抗污染能力和对重金属的去除能力.Amine-functionalized MCM-41 （ NHz-MCM-41 ） modified composite PVDF uhrafihration （UF） membrane was prepared for removing chromium （VI） in aqueous solution. A symmetrical hydrophilic and adsorptive layer was formed on the thin film with the porous NH2-MCM-41 nano-particles, which endowed the composite mem- brane with affinity to Cr（VI）. During 1 h filtration experiment, the flux attenuation ratio was 54.1% and 24.8% with PVDF and NH2-MCM-41 modified PVDF, respectively. Static adsorption experiments showed that the maximum adsorption capacity of Cr（VI） on membrane was 2. 8 mg/g at initial concentration of 20 mg/L, pH value of 3.5, and temperature of 25 ℃ , and adsorption reached equilibrium within 5 min. The continuous UF experiments demonstrated that the NH2-MCM-41 modified PVDF membrane could be used as effective filter medium to purify the water with trace chromium effluent concentration below 0. 5 mg/L during 11 h filtration. It is effective to endow the UF with capacity to remove heavy metals, and enhanced its anti-fouling ability by NH2-MCM-41 modification.

关 键 词：氨基化MCM-41 超滤膜 去除Cr(VI) 抗污染 

分 类 号：X52[环境科学与工程—环境工程]