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首页> 外文期刊>Environmental Science & Technology >Platinized WO_3 as an Environmental Photocatalyst that Generates OH Radicals under Visible Light
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Platinized WO_3 as an Environmental Photocatalyst that Generates OH Radicals under Visible Light

机译：铂化WO_3作为在可见光下产生OH自由基的环境光催化剂

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摘要

This study aims to understand the visible light photocatalytic activities of platinized WO_3 (pt/WO_3) on the degradation of aquatic pollutants and the role of main photooxidants. The presence of Pt on WO_3 is known to facilitate the multielectron reduction of O_2, which enables O_2 to serve as an electron acceptor despite the insufficient reduction potential of the conduction band electrons (in WO_3) for the one-electron reduction of O_2. The concurrent oxidative reactions occurring on WO_3 were markedly enhanced in the presence of Pt and accompanied the production of OH radicals under visible light which was confirmed by both a fluorescence method (using a chemical trap) and a spin trap method. The generation of OH radicals mainly comes from the reductive decomposition of H_2O_2 that is produced in situ from the reduction of O_2 on Pt/WO_3. The rate of in situ production of H_2O_2 under visible light was significantly faster with Pt/WO_3 than WO_3. Six substrates that were tested for the visible light (λ> 420 nm) induced degradation on pt/WO_3 included dichloroacetate (OCA), 4-chlorophenol (4-CP), tetramethylammonium (TMA), arsenite (As(Ⅲ)), methylene blue (MB), and acid orange 7 (AO7). The degradation (or conversion) of all six substrates was successfully achieved with Pt/WO_3 and the role of OH radicals in Pt/WO_3 photocatalysis seemed to be different depending on the kind of substrate. In the presence of fe/t-butyl alcohol (TBA: OH radical scavenger), the photocatalytic degradation was markedly reduced for 4-CP or completely inhibited for DCA and TMA whereas that of As(Ⅲ), MB, and A07 was little affected. Pt/WO_3 photocatalyst that oxidizes various substrates under visible light with a sufficient photostability can be applied for solar water treatment.
机译：这项研究旨在了解镀铂WO_3（pt / WO_3）的可见光光催化活性对水生污染物的降解以及主要光氧化剂的作用。已知在WO_3上Pt的存在促进了O_2的多电子还原，尽管导带电子（在WO_3中）对O_2的单电子还原没有足够的还原电势，但仍使O_2能够用作电子受体。在Pt的存在下，WO_3上同时发生的氧化反应显着增强，并且在可见光下伴随着OH自由基的产生，这通过荧光法（使用化学陷阱）和自旋陷阱法得以证实。 OH自由基的产生主要来自H_2O_2的还原分解，该还原是由Pt / WO_3上O_2的还原而原位产生的。 Pt / WO_3的可见光下H_2O_2的原位生成速率明显快于WO_3。测试了pt / WO_3上可见光（λ> 420 nm）诱导降解的六种底物，包括二氯乙酸盐（OCA），4-氯苯酚（4-CP），四甲基铵（TMA），亚砷酸盐（As（Ⅲ）），亚甲基蓝色（MB）和酸性橙色7（AO7）。用Pt / WO_3成功实现了所有六个底物的降解（或转化），并且OH自由基在Pt / WO_3光催化中的作用似乎因底物种类而异。在存在叔丁基醇（TBA：OH自由基清除剂）的情况下，4-CP的光催化降解显着降低，DCA和TMA则完全被抑制，而As（Ⅲ），MB和A07的光催化降解几乎没有受到影响。 。可以在可见光下以足够的光稳定性氧化多种底物的Pt / WO_3光催化剂可用于太阳能水处理。

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  • 来源
    《Environmental Science & Technology》 |2010年第17期|p.6849-6854|共6页
  • 作者

    JUNGWON KIM; CHUL WEE LEE; WONYONG CHOI;

  • 作者单位

    School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea;

    rnGreen Chemistry Division, KRICT, Daejeon 305-600, Korea;

    rnSchool of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea;

  • 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);
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