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首页> 外文期刊>Environmental Science & Technology >Surface-Catalyzed Chromium(VI) Reduction: The TiO_2-Cr~(VI) Mandelic Acid System
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Surface-Catalyzed Chromium(VI) Reduction: The TiO_2-Cr~(VI) Mandelic Acid System

机译:表面催化还原铬(VI):TiO_2-Cr〜(VI)扁桃酸体系

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摘要

As part of a study exploring the pathways and rates of Cr~(VI) reduction under environmentally relevant conditions, this paper examines the kinetics and mechanism of Cr~(VI) reduction by mandelic acid in the presence of 1.0 g/L TiO_2. The redox reaction is dramati-cally catalyzed by the oxide surface, and benzoylformic acid and benzaldehyde are the major products of mandelic acid oxidation. Comparisons of adsorption and reaction among mandelic acid, methyl mandelate, and atrolactic acid suggest that Cr~(VI) adsorption is required for the reaction to take place, while the adsorption of organic reductant may be unnecessary. The reaction, to our surprise, is zero order with respect to mandelic acid, but fractional order with respect to the ester methyl mandelate. This change in reaction order indicates that Cr~(VI) reduction by mandelic acid and methyl mandelate occurs via different rate-limiting steps.
机译:作为探索在环境相关条件下Cr〜(VI)还原途径和速率的研究的一部分,本文研究了在1.0 g / L TiO_2存在下扁桃酸还原Cr〜(VI)的动力学和机理。氧化还原反应被氧化物表面戏剧性地催化,苯甲酰基甲酸和苯甲醛是扁桃酸氧化的主要产物。扁桃酸,扁桃酸甲酯和阿奇乳酸之间的吸附和反应比较表明,要进行反应需要Cr〜(VI)吸附,而有机还原剂的吸附可能是不必要的。令我们惊讶的是,该反应相对于扁桃酸为零级,但相对于扁桃酸酯甲基为分数级。反应顺序的这种变化表明,扁桃酸和扁桃酸甲酯对Cr〜(VI)的还原是通过不同的限速步骤进行的。

著录项

  • 来源
    《Environmental Science & Technology》 |1996年第2期|p.463-472|共10页
  • 作者

    BAOLIN DENG; ALAN T. STONE;

  • 作者单位

    AL/EQC, 139 Barnes Drive, Suite 2, TyndallAFB, FL 32403-5323;

  • 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 环境化学;
  • 关键词

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