2,4-Dichlorophenol removal from water using an electrochemical method improved by a composite molecularly imprinted membrane/bipolar membrane

Yaoxing Liu; Zhang Yan; Riyao Chen; Yaping Yu; Xiao Chen; Xi Zheng; Xuehong Huang

doi:10.1016/j.jhazmat.2019.05.064

2,4-Dichlorophenol removal from water using an electrochemical method improved by a composite molecularly imprinted membrane/bipolar membrane

J Hazard Mater. 2019 Sep 5:377:259-266. doi: 10.1016/j.jhazmat.2019.05.064. Epub 2019 May 26.

Authors

Yaoxing Liu¹, Zhang Yan¹, Riyao Chen², Yaping Yu³, Xiao Chen¹, Xi Zheng¹, Xuehong Huang¹

Affiliations

¹ College of Environmental Science and Engineering, Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fujian Province, Fuzhou 350007, China.
² College of Environmental Science and Engineering, Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fujian Province, Fuzhou 350007, China. Electronic address: rychen409@sina.com.
³ College of Environmental Science and Engineering, Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fujian Province, Fuzhou 350007, China; Taizhou Vocational College of Science & Technology, Zhejiang Province, Taizhou 318020, China.

PMID: 31173974
DOI: 10.1016/j.jhazmat.2019.05.064

Abstract

Low efficiency is often a problem in electrochemical reductive hydrodechlorination (ERHD) to remove chlorinated compounds such as 2,4-dichlorophenol (24DCP) from water. In this study, a composite molecularly imprinted membrane (MIM)/bipolar membrane (BPM) was introduced onto a palladium-coated titanium mesh electrode (BPM/MIM@Pd/Ti) to increase the concentration of 24DCP on the surface of electrode and ERHD efficiency. The efficiency of ERHD of 24DCP increased from 70 to 88% by introduction of the two membranes, from 71 to 89% by increasing current density from 5.0 to 30 mA/cm², and from 80 to 94% by increasing the electrolyte concentration from 0.25 to 1.00 mol/L. Treatment with Fenton's reagent after ERHD achieved 100% 24DCP removal, with chemical oxygen demand and total organic carbon reductions of 91 and 87%, respectively. Notably, these reductions were greater than obtained from the direct oxidation of the 24DCP solution by Fenton's reagent alone (i.e., 98, 84, and 72%, respectively). No products were detected in solution by GC-MS after treatment with the proposed combination technology. The mechanism of 24DCP removal and degradation involved adsorption, electrochemical hydrodechlorination via H_ads, and Fenton oxidation. Results show the process has high potential for removing 24DCP from aqueous solution.

Keywords: 2,4-Dichlorophenol; Bipolar membrane; Electrochemical reduction; Fenton oxidation; Molecularly imprinted membrane.

Publication types

Research Support, Non-U.S. Gov't