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首页> 外文期刊>Environmental Science & Technology >Arsenite Oxidation-Enhanced Photocatalytic Degradation of Phenolic Pollutants on Platinized TiO_2
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Arsenite Oxidation-Enhanced Photocatalytic Degradation of Phenolic Pollutants on Platinized TiO_2

机译：镀铂TiO_2上砷氧化增强酚类污染物的光催化降解。

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摘要

The eflect of As(Ⅲ) on the photocatalytic degradation of phenolic pollutants such as 4-chlorophenol (4-CP) and bisphenol A (BPA) in a suspension of platinized TiO_2 (Pt/TiO_2) was investigated. In the presence of As(Ⅲ), the photocatalytic degradation of 4-CP and BPA was significantly enhanced, and the simultaneous oxidation of As(Ⅲ) to As(Ⅴ) was also achieved. This positive eflect of As(Ⅲ) on the degradation of phenolic pollutants is attributed to the adsorption of As(Ⅴ) (generated from As(Ⅲ) oxidation) on the surface of Pt/TiO_2, which facilitates the production of free OH radicals (~•OH_f) that are more reactive than surface-bound OH radicals (~•OH_s) toward phenolic pollutants. The generation of ~•OH_f was indirectly verified by using coumarin as an OH radical trapper and comparing the yields of coumarin-OH adduct (i.e., 7-hydroxycoumarin) formed in the absence and presence of As(Ⅴ). In repeated cycles of 4-CP degradation, the degradation efficiency of 4-CP gradually decreased in the absence of As(Ⅲ), whereas it was mostly maintained in the presence of As(Ⅲ), which was either initially present or repeatedly injected at the beginning of each cycle. The positive effect of As(Ⅲ) on 4-CP degradation was observed over a wide range of As(Ⅲ) concentrations (up to mM levels) with Pt/TiO_2. However, a high concentration of As(Ⅲ) (hundreds of μM) inhibited the degradation of 4-CP with bare TiO_2. Therefore, Pt/TiO_2 can be proposed as a practical photocatatyst for the simultaneous oxidation of phenolic pollutants and As(Ⅲ) in industrial wastewaters.
机译：研究了As（Ⅲ）对铂化TiO_2（Pt / TiO_2）悬浮液中4-氯苯酚（4-CP）和双酚A（BPA）等酚类污染物的光催化降解作用。在As（Ⅲ）存在下，4-CP和BPA的光催化降解显着增强，并且As（Ⅲ）同时氧化为As（Ⅴ）。 As（Ⅲ）对酚类污染物降解的积极作用归因于As（Ⅴ）（由As（Ⅲ）氧化生成）在Pt / TiO_2表面的吸附，促进了游离OH自由基的产生（ ~~ OH_f）比表面结合的OH自由基（〜•OH_s）对酚类污染物的反应性更高。通过使用香豆素作为OH自由基捕获剂并比较在不存在和存在As（Ⅴ）的情况下形成的香豆素-OH加合物（即7-羟基香豆素）的产率，间接证实了〜•OH_f的生成。在4-CP降解的重复循环中，在不存在As（Ⅲ）的情况下4-CP的降解效率逐渐降低，而在最初存在或反复注入As（Ⅲ）的情况下，其大部分维持不变每个周期的开始。在Pt / TiO_2的宽范围的As（Ⅲ）浓度（高达mM水平）下，都观察到了As（Ⅲ）对4-CP降解的积极作用。然而，高浓度的As（Ⅲ）（数百μM）抑制了裸露的TiO_2对4-CP的降解。因此，Pt / TiO_2可以作为一种实用的光催化剂同时氧化工业废水中的酚类污染物和As（Ⅲ）。

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  • 来源
    《Environmental Science & Technology》 |2014年第22期|13384-13391|共8页
  • 作者

    Jaesung Kim; Jungwon Kim;

  • 作者单位

    Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon, Gangwon-do 200-702, South Korea;

    Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon, Gangwon-do 200-702, South 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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