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首页> 外文期刊>Environmental Science & Technology >Photocatalytic Degradation of Water Contaminants in Multiple Photoreactors and Evaluation of Reaction Kinetic Constants Independent of Photon Absorption,Irradiance,Reactor Geometry,and Hydrodynamics
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Photocatalytic Degradation of Water Contaminants in Multiple Photoreactors and Evaluation of Reaction Kinetic Constants Independent of Photon Absorption,Irradiance,Reactor Geometry,and Hydrodynamics

机译：多种光反应器中水污染物的光催化降解和独立于光子吸收，辐照度，反应器几何形状和流体动力学的反应动力学常数的评估

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摘要

The literature on photo catalytic oxidation of water pollutants often reports reaction kinetic constants,which cannot be unraveled from photoreactor type and experimental conditions.This study addresses this challenging aspect by presenting a general and simple methodology for the evaluation of fundamental "intrinsic" reaction kinetic constants of photocatalytic degradation of water contaminants,which are independent of photoreactor type,catalyst concentration,irradiance levels,and hydrodynamics.The degradation of the model contaminant,oxalic acid (OA) on titanium dioxide (TiO_2) aqueous suspensions,was monitored in two annular photoreactors (PR1 and PR2).The photoreactors with significantly different geometries were operated under different hydro-dynamic regimes (turbulent batch mode and laminar flow-through recirculation mode),optical thicknesses,catalyst and OA concentrations,and photon irradiances.The local volumetric rate of photon absorption (LVRPA) was evaluated by the six-flux radiation absorption-scattering model (SFM).The SFM was further combined with a comprehensive kinetic model for the adsorption and photodecomposition of OA on TiO_2 to determine local reaction rates and,after integration over the reactor volume,the intrinsic reaction kinetic constants.The model could determine the oxidation of OA in both PR1 and PR2 under a wide range of experimental conditions.This study demonstrates a more meaningful way for determining reaction kinetic constants of photocatalytic degradation of water contaminants.
机译：关于水污染物的光催化氧化的文献经常报道反应动力学常数，无法从光反应器类型和实验条件中阐明。本研究通过提出一种通用的简单方法来评估基本的“内在”反应动力学常数，从而解决了这一难题。与光反应器类型，催化剂浓度，辐照度和流体力学无关的水污染物的光催化降解。在两个环形光反应器中监测了模型污染物草酸在二氧化钛（TiO_2）悬浮液上的降解。 （PR1和PR2）。具有显着不同几何形状的光反应器在不同的流体动力学机制（分批湍流模式和层流流通模式），光学厚度，催化剂和OA浓度以及光子辐照度下运行。通过六通量评估光子吸收（LVRPA）进一步将SFM与综合动力学模型相结合，用于OA在TiO_2上的吸附和光分解，以确定局部反应速率，并在反应器体积上积分后，确定固有反应动力学常数。可以在广泛的实验条件下确定PR1和PR2中OA的氧化。本研究证明了测定水污染物光催化降解反应动力学常数的更有意义的方法。

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  • 来源
    《Environmental Science & Technology》 |2013年第23期|13702-13711|共10页
  • 作者

    Ivana Grcic; Gianluca Li Puma;

  • 作者单位

    Faculty of Chemical Engineering and Technology,University of Zagreb,Marulicev trg 19,10000 Zagreb,Croatia;

    Environmental Nanocatalysis and Photoreaction Engineering Department of Chemical Engineering,Loughborough University,Loughborough LE11 3TU,United Kingdom;

  • 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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  • 正文语种 eng
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