TiO2纳滤膜对重金属离子的截留性能  

Research on rejection of heavy metal ions with TiO_2 nanofiltration membranes

作　　者：董国祥[1,2] 朱瓌之 李世大[1,2] 漆虹[1,2] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室 [2]膜科学技术研究所,南京210009

出　　处：《膜科学与技术》2012年第1期58-62,共5页Membrane Science and Technology

基　　金：国家自然科学基金青年基金(20906047);化学工程联合国家重点实验室开放基金资助项目(SKL-ChE-09A01);材料化学工程国家重点实验室自主课题(ZK 201002);江苏省高校然科学研究项目(11KJB530006);江苏省“六大人才高峰”高层次人才资助项目(无编号)

摘　　要：采用孔径为1.5nm的TiO2纳滤膜,在压力0.4～0.8MPa,pH值3～7的条件下,考察了膜对浓度范围为50～500mg/L的Cu(NO3)2、Ni(NO3)2、ZnCl2和CdCl2四种单组份重金属溶液的截留性能.结果表明:除Cd2+外,膜对重金属离子的截留率随溶液浓度的增大先增大,当浓度达到200mg/L后趋于稳定;升高压力膜的离子截留率会略有增加;当pH=6时,膜对Ni 2+和Cd2+的截留率最低,而对Cu2+和Zn2+的截留率在pH=5～6时达到最高.TiO2膜对Cu2+、Ni 2+、Zn2+和Cd2+的最高截留率分别可以达到96.9%、95.9%、92.5%和83.2%.Rejection properties of TiO2 nanofiltration membrane （ with mean pore size of 1.5 nm ） with re- spect to the heavy metal salt solutions, namely Cu（NO3）2, Ni（NOa）2, ZnCl2 and CdCl2 were investigated. The effects of processing parameters, such as pH, transmembrane pressure and concentration of heavy metal ions, on membrane jection rate were studied in detail. The results show that heavy metal ions rejec- tion of membrane increases at first with concentration while does not vary too much as the concentration reaches 200 mg/L. But this is not for Cd2＋. Rejection properties of membrane increases slightly as the transmembrane pressure elevated. The membrane exhibits minimal rejection properties towards Ni2＋ and Cd2＋ at a pH value of 6, where the maximal rejection rate towards Cu2＋ and Zn2＋ can be found. Rejection properties of TiO2 nanofiltration membrane towards Cu2＋ , Ni2＋ , Zn2＋ and Cd2＋ can reach maximum values of 96.9%, 95.9%, 92.5% and 83.2%, respectively.

关 键 词：陶瓷纳滤膜 TIO2 重金属离子 离子截留 

分 类 号：X781.1[环境科学与工程—环境工程]