TiO(2) Photocatalytic Degradation of Phenylarsonic Acid.
TiO(2) Photocatalytic Degradation of Phenylarsonic Acid.
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DOI：
10.1016/j.jphotochem.2009.12.004
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发表时间：
2010-02-05
影响因子：
4.3
通讯作者：
O'Shea, Kevin E.
中科院分区：
文献类型：
--
作者：
Zheng, Shan;Cai, Yong;O'Shea, Kevin E.
苯基取代砷化合物在家禽业中广泛用作饲料添加剂，已成为严重的环境问题。我们已经证明苯拉森酸（PA）很容易被TiO2光催化降解。采用Langmuir-Hinshelwood动力学模型计算TiO2光催化PA初始阶段的表观速率常数（kr）为2.8µmol/L·min，拟平衡常数(K)为34 L/mmol。溶液的pH值由于TiO2光催化剂的表面电荷和PA的形态而影响PA的吸附和光催化降解。苯酚、儿茶酚和对苯二酚是降解过程中的主要产物。通过在反应介质中加入适当的清除剂，考察了活性氧、•OH、1O2、O2−•和hVB+的作用，结果表明•OH在PA的降解中起主要作用。副产物研究表明，催化剂的表面在初级产物的形成和随后的氧化途径中起着关键作用，导致无机砷的矿化。TiO2光催化导致PA的快速破坏，可能对多种有机砷化合物的修复有吸引力。
Phenyl substituted arsenic compounds are widely used as feed additives in the poultry industry and have become a serious environmental concern. We have demonstrated that phenylarsonic acid (PA) is readily degraded by TiO2 photocatalysis. Application of the Langmuir–Hinshelwood kinetic model for the initial stages of the TiO2 photocatalysis of PA yields an apparent rate constant (kr) of 2.8 µmol/L·min and the pseudo-equilibrium constant (K) for PA is 34 L/mmol. The pH of the solution influences the adsorption and photocatalytic degradation of PA due to the surface charge of TiO2 photocatalyst and speciation of PA. Phenol, catechol and hydroquinone are observed as the predominant products during the degradation. The roles of reactive oxygen species, •OH, 1O2, O2−• and hVB+ were probed by adding appropriate scavengers to the reaction medium and the results suggest that •OH plays a major role in the degradation of PA. By-products studies indicate the surface of the catalyst plays a key role in the formation of the primary products and the subsequent oxidation pathways leading to the mineralization to inorganic arsenic. TiO2 photocatalysis results in the rapid destruction of PA and may be attractive for the remediation of a variety of organoarsenic compounds.
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