| 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 Publication | JOURNAL OF HAZARDOUS MATERIALS
 |
| ISSN | 0304-3894 |
| Volume | 391Pages:1-7 |
| Abstract | This 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 |
| Keyword | Vacuum ultraviolet (VUV) VUV/UV/persulfate Photon absorption distribution Degradation mechanism Water treatment |
| Document Type | 期刊论文 |
| Identifier | https://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. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Methylene blue degra（3245KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment