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首页> 外文期刊>RSC Advances >Concentration dependent effect of CuCl2 on the photocatalytic degradation of phenol over anatase, rutile and brookite TiO2
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Concentration dependent effect of CuCl2 on the photocatalytic degradation of phenol over anatase, rutile and brookite TiO2

机译：CuCl2浓度依赖性作用对锐钛矿，金红石和Broughite TiO2的光催化降解

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摘要

Effect of Cu ~(2+) ions on the TiO _(2) -photocatalyzed degradation of organic pollutants in water has been reported in the literature, but the results are controversial. In this work, the effects of Cu ~(2+) concentration, TiO _(2) structures, and light intensity have been re-investigated, by using phenol degradation in an acidic aqueous suspension as a model reaction. As the concentration of CuCl _(2) increased, the rates of phenol degradation over anatase, rutile, and brookite increased, and then decreased, but the reaction rate measured with P25 TiO _(2) always decreased. Such unusual behavior of P25 was also observed when CuCl _(2) was replaced with NaCl and MgCl _(2) , ascribed to the salt-induced particle aggregation. In all cases, Cu ~(+) species were formed, followed by reoxidation to Cu ~(2+) by O _(2) . However, at a high CuCl _(2) loading, metallic Cu was also detected, due to the competitive disproportionation of Cu ~(+) ions. An open circuit potential measurement with anatase and P25 film electrodes revealed that the interfacial electron transfer from the irradiated TiO _(2) to Cu ~(2+) was faster than that to O _(2) . Furthermore, the reaction rate was proportional to light intensity. The relevant quantum yield of phenol degradation over rutile upon the addition of CuCl _(2) was increased by approximately 4 times.
机译：在文献中报道了Cu〜（2+）离子对TiO _（2）的致催化剂的影响，但在文献中据报道了水中有机污染物的降解，但结果是有争议的。在这项工作中，通过在酸性水性悬浮液中使用酚类降解作为模型反应，已经重新研究了Cu〜（2+）浓度，TiO _（2）结构和光强度的影响。随着CuCl _（2）的浓度增加，苯酚降解锐钛矿，金红石和布鲁克钛矿的速率增加，然后降低，但用P25 TiO _（2）测量的反应速率总是降低。当用NaCl和MgCl _（2）代替盐诱导的颗粒聚集时，还观察到P25的这种不寻常的行为。在所有情况下，形成Cu〜（+）物种，然后通过O _（2）再氧化至Cu〜（2+）。然而，由于Cu〜（+）离子的竞争性歧化，在高CuCl _（2）负载下，也检测到金属Cu。利用锐钛矿和P25膜电极的开路电位测量显示，从辐照的TiO_（2）至Cu〜（2+）的界面电子转移比至O _（2）更快。此外，反应速率与光强度成比例。在加入CuCl _（2）时，苯酚降解在金红石上的相关量子产率提高了约4倍。

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