LüYong-tao,YANGYa-xin,LINLi,et al.Preparation of GO/CNC Thin Film Nanocomposite Membrane and Its Properties[J].China Water & Wastewater,2024,40(11):65-72.
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Preparation of GO/CNC Thin Film Nanocomposite Membrane and Its Properties

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第11期 Page: 65-72 Column: Date of publication: 2024-06-01
Author(s):
Lü　Yong-tao1; 2;  YANG　Ya-xin1; 2;  LIN　Li1; 2;  PAN　Yong-bao3;  CUI　Shuang-ke3;  WANG　Lei1; 2
（1. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Key Laboratory of Membrane Separation of Shaanxi Province， Research Institute of Membrane Separation Technology of Shaanxi Province， Xi’an 710055， China； 3. Shaanxi Modern Architecture Design & Research Institute Co. Ltd.， Xi’an 710021， China）
Keywords:
graphene oxide;  cellulose nanocrystal;  nanofiltration membrane;  interface polymerization;  chlorine resistance
Abstract:
This paper synthesized GO/CNC nanocomposite with good dispersion by modifying graphene oxide (GO) with cellulose nanocrystals (CNC), introduced the GO/CNC nanocomposite into the polyamide (PA) layer via interfacial polymerization to prepare modified nanofiltration membranes, and characterized the morphology and structure and tested the characteristics of the modified membrane, so as to improve the performance of the nanofiltration membranes. The surface of GO/CNC modified membrane had a more obvious convex fold structure, higher roughness and hydrophilicity. Its pure water flux reached 38.45 L/(m2·h) at 0.6 MPa, which was 84.86% and 53.92% higher than that of PA membrane and GO modified membrane, respectively. Its rejection rates of Na2SO4 and NaCl were 95.47% and 6.65%, respectively. After soaking in NaClO solution with concentration of 4 000 mg/L (pH=4) for 4 h, the normalized pure water flux of the PA membrane increased by nearly 50%, accompanied with a decrease of the normalized Na2SO4 rejection from 1.00 to 0.89. In contrast, the normalized pure water flux of the GO/CNC modified membrane only increased by 13%, and the Na2SO4 rejection was almost unaffected. The addition of GO/CNC significantly enhanced the permeate flux of the composite nanofiltration membrane, and exhibited good Na2SO4/NaCl separation selectivity and chlorine resistance.
Last Update: 2024-06-01