GO/PDA/CNT双层低压膜去除腐殖酸及抗污染性能  

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

作　　者：吴曜辰 曾嘉 王宇飞[1] 魏娜 刘秋杉 刘国涵 郭瑾[1] WU Yaochen;ZENG Jia;WANG Yufei;WEI Na;LIU Qiushan;LIU Guohan;GUO Jin(National Engineering Laboratory for Advanced Treatment and Reuse of Urban Sewage,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,城镇污水深度处理与资源化利用技术国家工程实验室,北京100124

出　　处：《膜科学与技术》2023年第6期61-70,共10页Membrane Science and Technology

基　　金：国家自然科学基金资助项目(51778014)。

摘　　要：腐殖酸(Humic acid,HA)是水体中常见的膜污染物质和消毒副产物前驱体.通过真空抽滤将碳纳米管(Carbon nanotubes,CNTs)和氧化石墨烯(Graphene oxide,GO)负载于基膜表面,结合聚多巴胺(Polydopamine,PDA)的交联黏合功能,制备了GO/PDA/CNT双层低压膜.采用ATR-FTIR分析证实了PDA在GO膜表面的聚合,通过超声破碎验证了双层膜的稳定性.结果表明,GO/PDA/CNT双层膜性能稳定,渗透通量达到1238 L/(m^(2)·h·MPa),高于GO膜的279 L/(m^(2)·h·MPa).该膜对HA的去除率达到88.5%,均高于GO膜(85.8%)和CNT膜(38.9%).GO膜和CNT膜的比通量在过滤HA过程中分别降至0.314和0.697,GO/PDA/CNT双层膜的比通量下降幅度最小(0.753).提高搅拌速率有利于双层膜对HA的去除并进一步缓解膜污染,但搅拌速率过高会加剧膜污染;酸性条件下双层膜对HA去除率最高(94.5%),膜污染相较于中性和碱性条件更为严重.GO/PDA/CNT双层膜的制备,有助于提高膜滤效率和强化腐殖质类有机物的去除,减少消毒副产物的产生.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/(m^(2)·h·MPa),which was higher than that of the GO membrane with 279 L/(m^(2)·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.

关 键 词：碳纳米管 氧化石墨烯 低压膜 腐殖酸 膜污染 

分 类 号：TQ028[化学工程]