Degradation of antibiotic chloramphenicol in water by pulsed discharge plasma combined with TiO2/WO3 composites: mechanism and degradation pathway

He Guo; Nan Jiang; Huijuan Wang; Na Lu; Kefeng Shang; Jie Li; Yan Wu

doi:10.1016/j.jhazmat.2019.03.051

Degradation of antibiotic chloramphenicol in water by pulsed discharge plasma combined with TiO₂/WO₃ composites: mechanism and degradation pathway

J Hazard Mater. 2019 Jun 5:371:666-676. doi: 10.1016/j.jhazmat.2019.03.051. Epub 2019 Mar 12.

Authors

He Guo¹, Nan Jiang², Huijuan Wang³, Na Lu⁴, Kefeng Shang⁴, Jie Li⁴, Yan Wu⁴

Affiliations

¹ Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
² Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China. Electronic address: jiangnan@dlut.edu.cn.
³ School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
⁴ Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China.

PMID: 30889463
DOI: 10.1016/j.jhazmat.2019.03.051

Abstract

Pulsed discharge plasma (PDP) combined with TiO₂/WO₃ composites for chloramphenicol (CAP) degradation was investigated. The prepared TiO₂/WO₃ composites were characterized by scanning electron microscope, transmission electron microscope, nitrogen adsorption apparatus, zeta sizer, X-ray diffraction, Raman spectra, UV-Vis absorption spectroscopy, X-ray photoelectron spectroscopy, photocurrent and electrochemical impedance spectroscopy. The degradation performance showed that the addition of TiO₂/WO₃ composites significantly enhanced the removal efficiency of CAP in PDP system. At a peak voltage of 18 kV, the highest removal efficiency of CAP could reach 88.1% in PDP system with 4 wt% TiO₂/WO₃, which was 36.8% and 26.0% higher than that in sole PDP system and PDP/TiO₂ system, respectively. The TiO₂/WO₃ composites significantly accelerated interfacial charge transfer process compared to the pure TiO₂. Besides, the effect of catalyst dosage and peak voltage on CAP removal was evaluated. OH, O₃O₂^-, h⁺ and high-energy electrons contributed to CAP degradation in PDP-TiO₂/WO₃ system. Addition of TiO₂/WO₃ composites can decompose O₃ and produce more OH and H₂O₂. The degradation intermediates were measured by liquid chromatography-mass spectrometry (LC-MS) and ion chromatography (IC). The cycling degradation experiment showed that the TiO₂/WO₃ composites have good reusability as well as stability.

Keywords: Catalysis; Chloramphenicol; Degradation; Pulsed discharge plasma; TiO(2)/WO(3).

Publication types

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

MeSH terms

Anti-Bacterial Agents / analysis*
Catalysis
Chloramphenicol / analysis*
Oxides / chemistry*
Plasma Gases / chemistry*
Titanium / chemistry*
Tungsten / chemistry*
Water Pollutants, Chemical / analysis*
Water Purification / methods*

Substances

Anti-Bacterial Agents
Oxides
Plasma Gases
Water Pollutants, Chemical
titanium dioxide
Chloramphenicol
tungsten oxide
Titanium
Tungsten