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Methylene blue degradation by the VUV/UV/persulfate process: Effect of pH on the roles of photolysis and oxidation
Wen, Dong; Li, Wentao; Lv, Jinrong; Qiang, Zhimin; Li, Mengkai
2020-06-05
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume391Pages:1-7
AbstractThis study investigated methylene blue (MB) degradation by the vacuum-ultraviolet/ultraviolet/persulfate (VUV/UV/PS) process using a mini-fluidic VUV/UV photoreaction system. Results show that MB degradation by the VUV/UV/PS process was significantly higher than that of the conventional UV/PS process, as the VUV photolysis of H2O and PS generated more reactive oxygen species (ROSs). HO center dot and SO4 center dot-, identified as the main ROSs, were mostly consumed by dissolved organic carbon and Cl- in real waters, respectively. Additionally, the impacts of solution pH and the concentrations of PS, humic acid, and inorganic ions (HCO3-, Cl-, NO3-, SO42-, Fe (II), and Fe(III)) were systematically evaluated. The solution pH significantly affected the photon absorption distributions, as well as the contributions of photolysis and oxidation to MB degradation, resulting in different variations in the degradation rate constant and total organic carbon removal ratio with increasing solution pH. At all tested pH levels (3.0-11.0), particularly under acidic conditions, HO center dot and SO4 center dot- were two predominant contributors to MB degradation, while VUV and UV photolysis contributed more when the solution pH increased. This study provides a highly efficient process for organic pollutant removal, which could be applied in water treatment.
Department环境水质学国家重点实验室
KeywordVacuum ultraviolet (VUV) VUV/UV/persulfate Photon absorption distribution Degradation mechanism Water treatment
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/44961
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Wen, Dong,Li, Wentao,Lv, Jinrong,et al. Methylene blue degradation by the VUV/UV/persulfate process: Effect of pH on the roles of photolysis and oxidation[J]. JOURNAL OF HAZARDOUS MATERIALS,2020,391:1-7.
APA Wen, Dong,Li, Wentao,Lv, Jinrong,Qiang, Zhimin,&Li, Mengkai.(2020).Methylene blue degradation by the VUV/UV/persulfate process: Effect of pH on the roles of photolysis and oxidation.JOURNAL OF HAZARDOUS MATERIALS,391,1-7.
MLA Wen, Dong,et al."Methylene blue degradation by the VUV/UV/persulfate process: Effect of pH on the roles of photolysis and oxidation".JOURNAL OF HAZARDOUS MATERIALS 391(2020):1-7.
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