...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >In Situ Photoelectrochemical Chloride Activation Using a WO_3 Electrode for Oxidative Treatment with Simultaneous H_2 Evolution under Visible Light
【24h】

In Situ Photoelectrochemical Chloride Activation Using a WO_3 Electrode for Oxidative Treatment with Simultaneous H_2 Evolution under Visible Light

机译：在可见光下使用WO_3电极原位光电化学氯化物活化同时氧化H_2的氧化处理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Reactive chlorine species (RCS) such as HOCl and chlorine radical species is a strong oxidant and has been widely used for water disinfection. This study investigated a photoelectrochemical (PEC) method of RCS production from ubiquitous chloride ions using a WO3 film electrode and visible light. The degradation of organic substrates coupled with H-2 evolution using a WO3 electrode was compared among electrochemical (EC), photocatalytic (PC), and PEC conditions (potential bias: +0.5 V vs Ag/AgCl; lambda > 420 nm). The degradation of 4-chlorophenol, bisphenol A, acetaminophen, carbamazepine, humic acid, and fulvic acid and the inactivation of E. coli were remarkably enhanced by in situ RCS generated in PEC conditions, whereas the activities of the PC and EC processes were negligible. The activities of the WO3 film were limited by rapid charge recombination in the PC condition, and the potential bias of +0.5 V did not induce any significant reactions in the EC condition. The PEC activities of WO3 were limited in the absence of Cl- but significantly enhanced in the presence of Cl-, which confirmed the essential role of RCS in this PEC system. The PEC mineralization of organic compounds was also markedly enhanced in the presence of Cl- where dark chemical chlorination by NaOCl addition induced a negligible mineralization. The H-2 generation was observed only at the PEC condition and was negligible at PC and EC conditions. On the other hand, the oxidation of chloride on a WO3 photoanode produced chlorate (ClO3-) as a toxic byproduct under UV irradiation, but the visible light-irradiated PEC system generated no chlorate.
机译：活性氯物质（RCS），例如HOCl和氯自由基物质是强氧化剂，已被广泛用于水消毒。这项研究调查了使用WO3薄膜电极和可见光从无处不在的氯离子生产RCS的光电化学（PEC）方法。在电化学（EC），光催化（PC）和PEC条件（电势偏置：+0.5 V vs Ag / AgCl；λ> 420 nm）之间，比较了使用WO3电极与H-2析出结合的有机基质的降解。在PEC条件下产生的原位RCS显着增强了4-氯苯酚，双酚A，对乙酰氨基酚，卡马西平，腐殖酸和黄腐酸的降解以及大肠杆菌的灭活，而PC和EC过程的活性可忽略不计。在PC条件下，WO3膜的活性受到快速电荷复合的限制，在EC条件下，+ 0.5 V的电位偏置不会引起任何明显的反应。在不存在Cl-的情况下，WO3的PEC活性受到限制，但是在存在Cl-的情况下，WO3的PEC活性显着增强，这证实了RCS在该PEC系统中的重要作用。在存在Cl-的情况下，有机化合物的PEC矿化作用也显着增强，其中通过NaOCl添加进行暗化学氯化可忽略不计的矿化作用。仅在PEC条件下观察到H-2生成，而在PC和EC条件下可忽略不计。另一方面，WO3光电阳极上的氯化物氧化在紫外线辐射下产生了有毒副产物氯酸盐（ClO3-），但可见光照射的PEC系统没有产生氯酸盐。

著录项

  • 来源
    《Environmental Science & Technology》 |2019年第16期|9926-9936|共11页
  • 作者

    Koo Min Seok; Chen Xiaofang; Cho Kangwoo; An Taicheng; Choi Wonyong;

  • 作者单位

    Pohang Univ Sci & Technol POSTECH Div Environm Sci & Engn Pohang 37673 South Korea;

    Guangdong Univ Technol Inst Environm Hlth & Pollut Control Guangdong Key Lab Environm Catalysis & Hlth Risk Guangzhou 510006 Guangdong Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号