左旋多巴改性MABR中空纤维膜

摘要

利用左旋多巴在碱性水溶液中的氧化交联成膜反应制备适于MABR过程的复合膜.通过浸泡法对多孔性聚丙烯中空纤维膜进行表面聚合改性,考察了左旋多巴的浓度、反应时间和溶液pH值对改性效果的影响.比较了改性前后膜的表面结构、水接触角及气体通量的变化.结果表明在1.5 g/L、pH=9.5的条件下,反应时间为7 h时,左旋多巴能在中空纤维表面形成一层稳定的无缺陷复合皮层,气体通量为0.3176 mL/(cm²·s),接触角为75.1°,在MABR测试实验中,复合膜的挂膜效果和处理能力均有较大提高.

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	王琴
	胡亮
	侯飞飞
	李保安

关键词：左旋多巴；聚丙烯中空纤维；表面聚合改性； MABR

Abstract：

A no-defect composite hollow fiber membrane was prepared through L-DOPA oxidation since its strong adhesion and film forming properties in alkaline aqueous solution. The effects of concentrations of L-DOPA, reaction time and solution pH on the modification were studied. The properties of modified membrane, such as surface topography, membrane hydrophobicity, gas flux and water contact angel, before and after the modification were analyzed, respectively. The no-defect surface can be formed at the concentration of 1.5 g/L (pH 9.5) after 7 h reaction, with a gas flux of 0.3176 mL/(cm²·s) and water contact angel of 75.1° were achieved. The MABR test indicated that the properties of COD and NH₄⁺-N removals of the modified membrane were improved efficiently.

Keywords： L-DOPA； polypropylene hollow fiber； surface polymerization； MABR

Received 2014-04-30;

Corresponding Authors: 李保安,E-mail: baoan.li@gmail.com. Email: baoan.li@gmail.com

About author: 王琴(1989-),女,硕士研究生,研究方向:膜与膜技术.

引用本文:

王琴, 胡亮, 侯飞飞, 李保安.左旋多巴改性MABR中空纤维膜[J]. 化学工业与工程, 2015,32(6): 52-57

Wang Qin, Hu Liang, Hou Feifei, Li Baoan.Surface Modification of Polypropylene Hollow Fiber Membrane with L-DOPA for MABR[J]. Chemcial Industry and Engineering, 2015,32(6): 52-57

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