Amino Acids Functionalized Graphene Oxide for Enhanced Hydrophilicity and Antifouling Property of Poly（vinylidene fluoride） Membranes

• Published in: 高分子科学：英文版 no. 7; pp. 805 - 819
• Main Author: Jian-hua Li Shuang-shuang Wang De-bin Zhang Xing-xing Ni Qi-qing Zhang
• Format: Journal Article
• Language: English
• Published: 2016
• Subjects: Zeta电位; 亲水性; 功能增强; 复合膜; 抗污染性能; 氧化石墨; 氨基酸; 聚偏氟乙烯
• ISSN: 0256-7679; 1439-6203

Herein, functionalized graphene oxide（GO） was prepared by the covalent functionalization with amino acids（lysine, glycine, glutamic acid and tyrosine） in this study. Zeta potential results demonstrated that covalent functionalization of GO with amino acids was favourable for their homogeneous dispersion in water and organic solvents. Based on the higher absolute value of zeta potential and the better dipersion stability of GO-lysine, the PVDF/GO-lysine hybrid membranes were then prepared via the phase inversion induced by immersion precipitation technique. SEM images showed a better pore diameter and porosity distribution on the PVDF/GO-lysine membrane surface. The zeta potential absolute value of the PVDF/GO-lysine membrane surface was higher than that of the virgin PVDF membrane. Furthermore, the PVDF/GO-lysine membranes surface exhibited good hydrophilicity. The water flux of PVDF/GO-lysine membranes can reach two times of that of the virgin PVDF membrane. And the BSA adsorbed amount on PVDF/GO-lysine surface was decreased to 0.82 mg/cm~2 for PVDF/GO-lysine-8% membrane. Filtration experiment results indicated that the fouling resistance was significantly improved for the PVDF/GO-lysine membranes. As a result, lysine functionalized GO will provide a promising method to fabricate graphene oxide based hybrid membranes with effective antifouling property and hydrophilicity.