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Published on: July 13, 2018
A nanofiltration membrane prepared by PDA-C3N4 for removal of divalent ions
Qiuyan Bi1, Chao Zhang2, Jiandong Liu2
1Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China E-mail: saxu@ecust.edu.cn; School of Chemical Engineering, Qinghai University, Xining 810016, China.
Abstract:
In this study, a positively charged nanofiltration (NF) membrane was prepared by interfacial polymerization for separation of divalent cations, whereby a nanomaterial (modified graphitic carbon nitride (g-C3N4) with poly(dopamine), PDA-C3N4) was incorporated into the active layer of the NF membrane. PDA-C3N4 sheets were synthesized from g-C3N4 sheets prepared by thermal oxidation of melamine, and the preparation conditions of NF membrane were also optimized. The results show that the roughness of PDA-C3N4 embedded NF membrane decreases, and the hydrophilicity and the permeation increase. The membrane also shows high rejection for divalent cations (Mg2+, Ca2+, Ba2+, Cu2+ and Zn2+) but low rejection (36.8%) for monovalent cation (Li+), as well as good fouling resistance performance. The fabricated membrane has the potential for treatment of industrial wastewater.
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