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Photocatalytic degradation of phenol and m-nitrophenol using irradiated TiO2 in aqueous solutions

机译：水溶液中辐照的TiO2光催化降解苯酚和间硝基苯酚

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摘要

Photocatalytic degradation of single and binary phenol and m-nitrophenol (m-NP) in aqueous solutions by commercial TiO2 powders (Degussa P-25) under UV irradiation was examined. The influences of various operating parameters including the initial reactant concentration (0.13-0.71 mM), solution pH (4.1-12.7), and the presence of the second reactant on photodegradation were studied. The effect of TiO2 pre-wetting with aqueous solution on phenol photodegradation was also studied. It was shown that the degradation rates of phenol and m-NP decreased with increasing initial reactant concentrations. The optimal solution pH for the photodegradation of single phenol and m-NP was at around 7.4 and 8.9, respectively. Compared to the single systems, the photodegradation rates of phenol and m-NP in binary systems decreased, particularly when the second reactant was in excess. Moreover, the photodegradation of either single or binary reactants in aqueous solutions satisfactorily followed the pseudo-first-order kinetics.
机译：研究了市售TiO2粉末（Degussa P-25）在紫外线照射下对水溶液中的单一和二元酚和间硝基苯酚（m-NP）的光催化降解。研究了包括初始反应物浓度（0.13-0.71 mM），溶液pH（4.1-12.7）和第二反应物的存在在内的各种操作参数对光降解的影响。还研究了TiO2水溶液预润湿对苯酚光降解的影响。结果表明，随着初始反应物浓度的增加，苯酚和m-NP的降解率降低。单酚和间位NP光降解的最佳溶液pH分别为7.4和8.9左右。与单一体系相比，二元体系中苯酚和间位NP的光降解速率降低，特别是当第二种反应物过量时。此外，水溶液中单一或二元反应物的光降解均令人满意地遵循拟一级动力学。

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