Lü Yong-tao,WU Hao-wei,WEN Jian-ping,et al.Preparation and Salt Separation Performance of rGO/ZIF-8 Modified Polyamide Nanofiltration Membrane[J].China Water & Wastewater,2021,37(5 5):31-36.
Click Copy

Preparation and Salt Separation Performance of rGO/ZIF-8 Modified Polyamide Nanofiltration Membrane

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 5 5 Page: 31-36 Column: Date of publication: 2021-03-01
Author(s):
Lü Yong-tao1; 2; WU Hao-wei1; 2; WEN Jian-ping3; ZHANG Ying4; HE Long1; 2; 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. Beijing Origin Water Technology Co.Ltd., Beijing 102206, China; 4. Beijing Origin Water Membrane Technology Co. Ltd., Beijing 101407, China)
Keywords:
modification of nanofiltration membrane; rGO/ZIF-8; performance of separating salt; interface polymerization; hydrophilic property
Abstract:
To improve the performance of nanofiltration membranes, the rGO/ZIF-8 composite nanomaterial was prepared by hydrothermal synthesis, and was introduced into the functional layer of the nanofiltration membrane by the interfacial polymerization method to make a new modified polyamide composite nanofiltration membrane.The surface morphology, structure and salt separation performance of the modified membrane were studied. It was found that gully-like polyamide cluster protrusions appeared on the surface of the modified membrane, the roughness was greatly improved, the negative electrical property was enhanced, the contact angle was reduced to 42.7°, and the hydrophilic property was improved. Using Na2SO4 to investigate the salt separation performance, it was found that the original membrane’s rejection rate decreased from 95.8% to 85.6%, the pure water flux nearly doubled to 39.2 L/(m2·h), and the performance of 48 h continuous operation was stable. The results show that although the introduction of the new rGO/ZIF-8 material will cause a slight decrease in the rejection rate, it can greatly increase the water flux of the modified nanofiltration membrane.
Last Update: 2021-03-01