Selective removal of Cl- and F- from complex solution via electrochemistry deionization with bismuth/reduced graphene oxide composite electrode

Xiaobo Min; Mingfei Zhu; Yingjie He; Yunyan Wang; Haoyu Deng; Sheng Wang; Linfeng Jin; Haiying Wang; Liyuan Zhang; Liyuan Chai

doi:10.1016/j.chemosphere.2020.126319

Selective removal of Cl^- and F^- from complex solution via electrochemistry deionization with bismuth/reduced graphene oxide composite electrode

Chemosphere. 2020 Jul:251:126319. doi: 10.1016/j.chemosphere.2020.126319. Epub 2020 Mar 9.

Authors

Xiaobo Min¹, Mingfei Zhu², Yingjie He², Yunyan Wang¹, Haoyu Deng², Sheng Wang³, Linfeng Jin², Haiying Wang⁴, Liyuan Zhang⁵, Liyuan Chai¹

Affiliations

¹ State Key Laboratory of Powder Metallurgy, Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, 410083, China.
² State Key Laboratory of Powder Metallurgy, Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China.
³ Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, 410083, China.
⁴ State Key Laboratory of Powder Metallurgy, Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, 410083, China. Electronic address: haiyw25@yahoo.com.
⁵ Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam-Golm, Germany. Electronic address: zhang_livyl@csu.edu.cn.

PMID: 32169717
DOI: 10.1016/j.chemosphere.2020.126319

Abstract

Electro-adsorption is attracting increasing attention as an emerging technology for removing ionic species from water but suffer from low selectivity. In this work, a bismuth/reduced graphene oxide nanocomposite electrode was fabricated by a facile and green method. Based on this material, an electrode with improved selectivity by electrochemistry deionization system was successfully fabricated. The bismuth nanoparticles were uniformly covered with reduced graphene oxide plates and the ratio of Bi on the whole materials is 79.56%. Bismuth/reduced graphene oxide showed ions selectivity in the order of Cl^- > F^- ≫ [Formula: see text] . The average Cl^- removal capacity can reach as high as 62.59 mg g^-1. Moreover, bismuth/reduced graphene oxide electrodes have good regeneration performance. Typically, in the 10 adsorption-desorption multicycles, the salt absorption/desorption capacity of the hybrid capacitive deionization system is stable and reversible. This research opened a hopeful window to design and synthesize effective materials to selectively remove the ionic species to purify the water.

Keywords: Bismuth; Chloride; Electro-adsorption; Fluoride; Regeneration; Selectivity.

MeSH terms

Adsorption
Bismuth / chemistry
Chlorine / chemistry*
Electrochemical Techniques
Electrochemistry
Electrodes
Fluorine / chemistry*
Graphite
Ions
Sodium Chloride
Water Pollutants, Chemical / chemistry*
Water Purification / methods*

Substances

Ions
Water Pollutants, Chemical
graphene oxide
Fluorine
Sodium Chloride
Chlorine
Graphite
bismuth oxide
Bismuth