电场强化煤基炭膜处理含酚废水过程中的失活与再生性能研究  

Deactivation and regeneration performance of electric field enhanced coal-based carbon membrane during treatment of phenolic wastewater

作　　者：辛红 潘宗林 徐爽 严晓青 范新飞 宋成文[1] 王同华 XIN Hong;PAN Zonglin;XU Shuang;YAN Xiaoqing;FAN Xinfei;SONG Chengwen;WANG Tonghua(College of Environmental Sciences and Engineering,Dalian Maritime University,Dalian 116026,China;Group of Carbon Membrane and Porous Carbon Materials,State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连海事大学环境科学与工程学院,大连116026 [2]大连理工大学化工学院精细化工国家重点实验室,炭膜及多孔炭材料课题组,大连116024

出　　处：《膜科学与技术》2021年第6期138-145,共8页Membrane Science and Technology

基　　金：辽宁省高等学校创新人才支持计划;中央高校基本科研业务(3132021155)。

摘　　要：电场强化煤基炭膜(CM)实现了电化学氧化与膜分离技术的一体化耦合,在有机废水处理领域展现出良好的应用前景,但在长周期处理过程中会出现催化活性下降、水处理性能降低的现象.以模拟含酚废水为对象研究了电场强化CM在含酚废水处理过程中的失活过程与再生方法,采用扫描电镜和电化学工作站研究了失活前后炭膜的微观形貌和电化学性能,讨论了CM的失活机理,考察了不同处理方法对失活炭膜(CM-D)的再生效果.结果表明,在电场强化的作用下(2.0 V),CM对水中苯酚的去除效率显著提升;处理高浓度废水会加速CM的失活;CM失活的主要原因是苯酚分子电聚合生成了聚合物沉积在CM的颗粒表面,覆盖了电化学活性位点.采用溶剂清洗和电化学氧化处理难以实现CM的完全再生;热解处理表现出较好的再生性能,且随着热解温度的升高,再生后CM-D的水处理性能提升,当温度为600℃时,CM-D的性能恢复到与原膜相当,说明此温度条件下处理对CM-D具有良好的再生效果.The electric field enhanced coal-based carbon membrane(CM),which simultaneously couples electrochemical oxidation and membrane separation,shows the great application prospects for organic wastewater treatment.However,the catalytic activity of CM will decrease during the long-tern operation,thus resulting in the reduction in water treatment performance.In this work,the deactivation process and regeneration method of electric field-enhanced CM during phenolic wastewater treatment was investigated based on the simulated phenolic wastewater.The micromorphology and electrochemical performance of the CM and deactivated CM(CM-D)were studied by scanning electron microscopy(SEM)and electrochemical workstation,respectively.The deactivation mechanism of CM was discussed and the regeneration performance of CM-D by different treatment methods were investigated.Results show that the phenol removal efficiency of CM is significantly improved under the applied voltage of 2.0 V.The deactivation of CM will be accelerated during the treatment of high-concentration wastewater.The main reason for the deactivation of CM was the electropolymerization of phenol molecules to form a polymer deposited on the surface of the CM particles,which covered the electrochemically active sites.It is difficult to achieve the complete regeneration of CM-D by solvent cleaning and electrochemical oxidation treatment.The pyrolysis treatment possesses better regeneration performance,the water treatment performance of CM-D after regeneration increases with the increase of pyrolysis temperature.The performance of CM-D is almost completely restored when the temperature reaches to 600℃,indicating the good regeneration performance on CM-D under this condition.

关 键 词：煤基炭膜 电场强化膜分离 含酚废水 失活机理 再生方法 

分 类 号：TQ028.8[化学工程]