膜科学与技术

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Double-layer GO/PDA/CNT low-pressure membrane for humic acid removal and fouling control

Authors： WU Yaochen, ZENG Jia, WANG Yufei, WEI Na, LIU Qiushan, LIU Guohan, GUO Jin

Units： National Engineering Laboratory for Advanced Treatment and Reuse of Urban Sewage，Beijing University of Technology，Beijing 100124，China

KeyWords： carbon nanotubes; graphene oxide; low-pressure membrane; humic acid ；membrane fouling

ClassificationCode：

year,volume(issue):pagination： 2023,43(6):61-70

Abstract：

Humic acid (HA) is a common membrane fouling substance and precursor of disinfection by-products in water. Carbon nanotubes (CNTs), polydopamine (PDA) and graphene oxide (GO) were used to prepare the double-layer GO/PDA/CNT low-pressure membrane by vacuum filtration. The presence of PDA on the surface of GO membrane was confirmed by ATR-FTIR analysis, and the stability of the double-layer membrane was verified by ultrasonic fragmentation. The permeability of the GO/PDA/CNT membrane was 1238 L/（m2·h·MPa）, which was higher than that of the GO membrane with 279 L/（m2·h·MPa）. The humic acid removal rate of GO/PDA/CNT membrane was 88.5%, higher than that of GO membrane (85.8%) and CNT membrane (38.9%). After filtration, the specific flux of GO membrane and CNT membrane decreased to 0.314 and 0.697, respectively. The specific flux of GO/PDA/CNT membrane decreased the least (0.753).Increasing the stirring rate improved the removal of HA and reduced membrane fouling. High stirring rate aggravated the membrane fouling. Under acidic condition the HA removal rate of GO/PDA/CNT membrane was the highest (94.5%) and the membrane fouling was the most serious. The preparation of GO/PDA/CNT double-layer membrane will improve membrane filtration efficiency and enhance the removal of humic substances, as well as reduce the generation of disinfection by-products.

Funds：

国家自然科学基金资助项目（51778014）

AuthorIntro：

吴曜辰（1997-），男，甘肃靖远人，硕士研究生，研究方向为污水深度处理与膜污染控制，E-mail：wu_yc@emails.bjut.edu.cn

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