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Preparation and Performance of TFN Membrane Based on Graphene Quantum Dots

Authors： OUYANG Guo-z，LI Xin-dong，ZHANG Xin，YUAN Jian-bin，LI Hai-ke，LI Lang，LI Wen-hao，ZHONG Zhao-huang，HUANG Wan-fu

Units： 1 Ganzhou Innovation Center for Water Quality Security Technology at Ganjiang River Basin, Jiangxi University of Science and Technology, Ganzhou, 341000, China； 2 Ganzhou Key?Laboratory?of?Basin Pollution Simulation and Control, Jiangxi University of Science and Technology, Ganzhou 34100, China

KeyWords： Graphene quantum dots; TFN; interfacial polymerization; nanofiltration; modified

ClassificationCode：TQ052；X799.3

year,volume(issue):pagination： 2021,41(2):41-50

Abstract：

Graphene quantum dots (GQDs) was incorporated into the separation functional layer as an aqueous additive by interfacial polymerization of piperazine (PIP) and trimesoyl chloride (TMC) to preparation TFN membrane. The samples were characterized by fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), atomic force microscope (AFM), Zeta potential and water contact angle. It was found that the surface structure, electronegativity and hydrophilicity of the GQDs-PA-TFN membrane were effectively improved even though the content of GQDs in the aqueous phase was low. At the same time, in order to ensure the efficient interception of small molecules by GQDs-PA-TFN membrane, the secondary interfacial polymerization reaction was carried out without sacrificing the flux of the TFN membrane. With the addition of GQDs at 0.003 wt%, the permeation of the GQDs-PA-TFN membrane prepared under the optimal reaction conditions obtained by the experiment reached 36.9 L/m2•h under the pressure of 0.6 MPa, which was 1.4 times that of the TFC membrane without GQDs, and the rejection of MgSO4 was 95.8%.

Funds：

江西省教育厅科技项目（GJJ160619）；国家级大学生创新创业训练项目（201910407009）；江西省研究生创新专项资金项目（YC2020-S456）

AuthorIntro：

欧阳果仔（1995-），男，江西吉安，硕士生，膜法水处理技术，E-mail: oy08192571@163.com

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