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

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 excelle...

Full description

Saved in:
Bibliographic Details
Published in:Chemosphere (Oxford) 2023-09, Vol.335, p.139021, Article 139021
Main Authors: Lou, Jing, An, Jiutao, Wang, Xiangyou, Yang, Xiaonan, Lu, Guanglu, Wang, Liang, Zhao, Zitong
Format: Article
Language:English
Subjects:
Antibiotic wastewater
aqueous solutions
DBD plasma
density functional theory
Mineralization
oxytetracycline
toxicity
UVC
VUV
wastewater treatment
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. [Display omitted] •DBD/VUV/UVC system exhibited an outstanding performance of antibiotics removal.•The introduction of VUV/UVC facilitated the generation and effective utilization of ROS.•O3, HO⋅, O2·−, and 1O2 contributed to OTC degradation.•DBD/VUV/UVC process showed great potential in practical wastewater treatment.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2023.139021