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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Heterogeneous Photocataiytic Oxidation of Acetone for Air Purification by Near UV-Irradiated Titanium Dioxide
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Heterogeneous Photocataiytic Oxidation of Acetone for Air Purification by Near UV-Irradiated Titanium Dioxide

机译：紫外光辐照的二氧化钛对空气的丙酮进行​​异质光催化氧化

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摘要

This work presents a photocatalysis-based method to treat and purify air because of its broad applicability to common, oxidizable air contaminants. The effect of oxygen content, temperature, water vapor, and acetone concentration on the photooxidation of acetone on TiO_2 surface was investigated. The photocatalytic decomposition reaction of acetone obeyed the first-order equation. The decomposition rate increased with increasing the oxygen content. The rate of acetone oxidation increased when water vapor increased from 18.7 to 417 μM and decreased at higher than 417 μM. The conversion and mineralization of acetone decreased at higher than 138℃. The initial rate of acetone degradation can be well described by the Langmuir-Hinshelwood rate form. The specific reaction rate constant and the equilibrium adsorption are 15.8 μM/min and 0.0671 L/μM, respectively. The difference between observed and estimated half-lives became larger when the initial concentration of acetone was increased. It is assumed that the intermediates competed with parent compound so that delayed the half-life. The detection of CO_2 production can support this assumption.
机译：这项工作提出了一种基于光催化的方法来处理和净化空气，因为它对常见的可氧化空气污染物具有广泛的适用性。研究了氧含量，温度，水蒸气和丙酮浓度对丙酮在TiO_2表面上光氧化的影响。丙酮的光催化分解反应服从一级方程式。分解速率随氧含量的增加而增加。当水蒸气从18.7增加到417μM时，丙酮氧化速率增加，而在高于417μM时，丙酮氧化速率降低。高于138℃时，丙酮的转化率和矿化度降低。丙酮降解的初始速率可以用Langmuir-Hinshelwood速率表很好地描述。比反应速率常数和平衡吸附分别为15.8μM/ min和0.0671L /μM。当丙酮的初始浓度增加时，观察到的半衰期与估计的半衰期之间的差异变大。假定中间体与母体化合物竞争从而延迟了半衰期。检测CO_2的产量可以支持这一假设。

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