Enhanced degradation of oxytetracycline in aqueous solution by DBD plasma-coupled vacuum ultraviolet/ultraviolet (VUV/UVC) system

被引：5
|
作者：
Lou J. [1 ]
An J. [2 ]
Wang X. [1 ]
Yang X. [1 ]
Lu G. [2 ]
Wang L. [1 ]
Zhao Z. [1 ]
机构：
[1] School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo
[2] College of Resources and Environment Engineering, Shandong University of Technology, Zibo
来源：
Chemosphere | 2023年 / 335卷
基金：
中国国家自然科学基金;
关键词：
Antibiotic wastewater; DBD plasma; Mineralization; UVC; VUV;
D O I：
10.1016/j.chemosphere.2023.139021
中图分类号：
学科分类号：
摘要：
A systematic investigation of coupling dielectric barrier discharge (DBD) plasma and different ultraviolet bands (UVA, UVB, UVC, and VUV) was constructed for antibiotic-contaminant wastewater treatment. Compared with DBD, UV, or other combined DBD/UV systems, the DBD/VUV/UVC system exhibited excellent degradation and mineralization efficiencies for oxytetracycline (OTC), achieving 93.2% removal rate (reaction rate constant 1.05 min−1) and higher decarbonization efficiency (mineralization rate 0.47 mg C min−1) within 2.5 min treatment. The radical quenching tests revealed that HO⋅, O2·-, and 1O2 were all involved in the decomposition of OTC in the DBD/VUV/UVC system, among which O2·- played a dominant role. Possible degradation pathways of OTC in the DBD/VUV/UVC process were proposed using density functional theory and detected intermediates. Four indexes were used to assess the toxicity of OTC and its degraded intermediates. The inorganic anions and HA slightly reduced the degradation efficiency of the DBD/VUV/UVC system. This research provides new ideas to broaden the application of plasma and alleviate the water environment crisis. © 2023 Elsevier Ltd
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