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Research on rejection of heavy metal ions with TiO2 nanofiltration membranes

Authors： DONG Guoxiang, ZHU Guizhi, LI Shida, QI Hong*

Units： State Key Laboratory of Materials-Oriented Chemical Engineering, Membrane Science and Technology Research Center, Nanjing University of Technology, Nanjing, 210009 China

KeyWords： ceramic nanofiltration membranes; titanium dioxide; heavy metal ions; rejection

ClassificationCode：TQ028.5

year,volume(issue):pagination： 2012,32(1):59-63

Abstract：

Retention properties of TiO2 nanofiltration membrane ( with mean pore size of 1.5 nm ) with respect to the heavy metal salt solutions, namely Cu(NO3)2, Ni(NO3)2, ZnCl2 and CdCl2 were investigated. The effects of processing parameters, such as pH, transmembrane pressure and concentration of heavy metal ions, on membrane retention rate were studied in detail. Results show that heavy metal ions rejection of membrane increases at first with concentration while does not vary too much as the concentration reaches 200 mg•L-1. But this is not for Cd2+. Retention properties of membrane increases slightly as the transmembrane pressure elevated. The membrane exhibits minimal retention properties towards Ni2+ and Cd2+ at a pH value of 6, where the maximal retention rate towards Cu2+ and Zn2+ can be found. Retention 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.

Funds：

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），

AuthorIntro：

董国祥(1985-)，男，江苏盐城人，硕士生，主要从事多孔陶瓷膜支撑体的制备. * 通讯联系人，E-mail: hqinjut@yahoo.com.cn，电话：025-83172279，传真：025-83172292.

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