Oxalic acid cross-linked sodium alginate and carboxymethyl chitosan hydrogel membrane for separation of dye/NaCl at high NaCl concentration

作     者：Wenbin Xie Kongyin Zhao Lijing Xu Ningning Gao Hui Zhao Zelong Gong Linan Yu Jun Jiang Wenbin Xie;Kongyin Zhao;Lijing Xu;Ningning Gao;Hui Zhao;Zelong Gong;Linan Yu;Jun Jiang

作者机构：State Key Laboratory of Separation Membranes and Membrane Processes/National Centre for International Joint Research on Separation MembranesTiangong UniversityTianjin 300387China SINOPEC Research Institute of Petroleum ProcessingBeijing 100083China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2022年第33卷第4期

页      面：1951-1955页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081702[工学-化学工艺] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 51708407 and 51803150) the Science and Technology Plans of Tianjin (Nos. 19JCQNJC02900, 18ZXJMTG00120,20JCYBJC00120)。 

主　　题：Hydrogel filtration membranes Oxalic acid Sodium alginate High salt wastewater Salt resistance 

摘      要：Dye desalination is a challenge in the treatment of textile wastewater with high salt concentration. It is imperative to develop salt resistance membrane that is from sustainable materials to effectively treat dye/salt mixtures. And most polymer membrane materials are non-renewable petrochemical resources.In this paper, a green hydrogel membrane(CMCS-OA-Na Alg) was prepared by non-metallic ions of oxalic acid(OA) cross-linking of two natural macromolecules of sodium alginate(Na Alg) and carboxymethyl chitosan(CMCS). The membrane showed excellent anti-swelling at high salt concentration(swelling rate less than 8.0% in 10.0 wt% Na Cl solution) and good anti-fouling performance. The membrane exhibited a rejection higher than 95.0% for dyes(bright blue, direct black, direct red, and Congo red) and lower than7.0% for Na Cl, which can achieve better dye/Na Cl separation performance. This study provides a promising membrane material for high salt textile wastewater treatment only using water and carbohydrates as raw materials without any organic solvents.