Accelerated methylene blue (MB) degradation by Fenton reagent exposed to UV or VUV/UV light in an innovative micro photo-reactor
文献类型：期刊论文
| 作者 | Li, Mengkai; Qiang, Zhimin; Pulgarin, Cesar; Kiwi, John |
| 刊名 | APPLIED CATALYSIS B-ENVIRONMENTAL
 |
| 出版日期 | 2016-06-15 |
| 卷号 | 187期号:0页码:83-89 |
| 关键词 | Vacuum-UV (VUV) Photo-Fenton Micro photo-reactor Methylene blue Oxidative radicals Reaction mechanism |
| 英文摘要 | This study presents the accelerated discoloration/degradation of methylene blue (MB) in solution by Fenton reagent under exposure to ultraviolet (UV) or Vacuum-UV/UV (VUV/UV) light in an innovative micro photo-reactor. The MB degradation was kinetically faster when using VUV/UV light at 254/185 nm compared to UV-irradiation at 254 nm. Oxidative radicals produced by the photo-Fenton process were identified with appropriate scavengers. The addition of benzoquinone (BQ) at millimolar (mM) concentrations to MB solutions precluded completely the MB photo-induced bleaching, while tert-butanol hindered to a lesser extent the MB degradation suggesting that HO2 center dot was the predominant intermediate leading to MB degradation. The VUV/UV micro photo-reactor comprised mercury resonance lines at 185 and 254 nm. The photon percentages absorbed by water were estimated to be 16.8% at 254nm and 78.3% at 185 nm by water, while those absorbed by H2O2 were 0.9% and 2.2%, correspondingly. The solution parameters affecting the features of MB degradation, such as MB, Fe, and H2O2 concentrations, were explored and reaction mechanism was proposed. The lifetimes of (OH)-O-center dot and HO2 center dot were estimated to be 2 ns and 0.38 s under an optimized solution with 0.016 mM MB, 0.147 mM H2O2 and 0.05 mM Fe3+. Moreover, an estimation of the mean free paths of these radicals in solution provided the evidence that it was the radical lifetimes and mean-free paths, not their oxidation potentials that controlled the MB degradation kinetics. This study shows the potential of this VUV/UV assistant photo-Fenton process for the degradation of diluted organic compounds in aqueous solution. (C) 2016 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/36009]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Li, Mengkai,Qiang, Zhimin,Pulgarin, Cesar,et al. Accelerated methylene blue (MB) degradation by Fenton reagent exposed to UV or VUV/UV light in an innovative micro photo-reactor[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2016,187(0):83-89. |
| APA | Li, Mengkai,Qiang, Zhimin,Pulgarin, Cesar,&Kiwi, John.(2016).Accelerated methylene blue (MB) degradation by Fenton reagent exposed to UV or VUV/UV light in an innovative micro photo-reactor.APPLIED CATALYSIS B-ENVIRONMENTAL,187(0),83-89. |
| MLA | Li, Mengkai,et al."Accelerated methylene blue (MB) degradation by Fenton reagent exposed to UV or VUV/UV light in an innovative micro photo-reactor".APPLIED CATALYSIS B-ENVIRONMENTAL 187.0(2016):83-89. |
入库方式： OAI收割
来源：生态环境研究中心
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