Excellent performance of electro-assisted catalytic wet air oxidation of refractory organic pollutants

Min Sun; Yu Zhang; Shi-Yu Kong; Lin-Feng Zhai; Shaobin Wang

doi:10.1016/j.watres.2019.04.040

Excellent performance of electro-assisted catalytic wet air oxidation of refractory organic pollutants

Water Res. 2019 Jul 1:158:313-321. doi: 10.1016/j.watres.2019.04.040. Epub 2019 Apr 20.

Authors

Min Sun¹, Yu Zhang¹, Shi-Yu Kong¹, Lin-Feng Zhai², Shaobin Wang³

Affiliations

¹ Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China.
² Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China. Electronic address: linfengzhai@hfut.edu.cn.
³ School of Chemical Engineering, The University of Adelaide, Adelaide, SA5005, Australia. Electronic address: shaobin.wang@adelaide.edu.au.

PMID: 31051376
DOI: 10.1016/j.watres.2019.04.040

Abstract

Catalytic wet air oxidation (CWAO) is a clean process for the treatment of toxic and/or biorefractory contaminants while it is a challenge to perform the CWAO at room temperature. Herein, we report an electro-assisted CWAO (ECWAO) process using partially oxidized nickel (Ni@NiO) immobilized on a porous graphite felt (GF) as a catalytic anode. Such a process demonstrates extensive effectiveness and good stability in the deep oxidation of various organic pollutants including triclosan (TCS), bisphenol A, ciprofloxacin, sulfamethoxazole, congo red, crystal violent and rodamine B at room temperature. The typical pollutant TCS is rapidly degraded within 105 min with a mineralization efficiency of 86.0 ± 1.4%, at specific energy consumption of 5.3 ± 0.3 kW h kg-TOC^-1. NiO is identified as the catalytically active site at which O₂ is dissociated and electro-activated to oxidize the TCS at room temperature. The ECWAO process on the anodic Ni@NiO/GF presents a great potential as an environmental-friendly and energy-saving process for treating high concentrations of refractory organic pollutants under ambient condition.

Keywords: Air oxidation; Anode electric field; Catalysis; Mineralization; Nickel oxide.

MeSH terms

Air
Catalysis
Environmental Pollutants*
Nickel
Oxidation-Reduction
Water Pollutants, Chemical*

Substances

Environmental Pollutants
Water Pollutants, Chemical
Nickel