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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 Cu2+ ions on the TiO2-photocatalyzed degradation of organic pollutants in water has been reported in the literature, but the results are controversial. In this work, the effects of Cu2+ concentration, TiO2 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 CuCl2 increased, the rates of phenol degradation over anatase, rutile, and brookite increased, and then decreased, but the reaction rate measured with P25 TiO2 always decreased. Such unusual behavior of P25 was also observed when CuCl2 was replaced with NaCl and MgCl2, ascribed to the salt-induced particle aggregation. In all cases, Cu+ species were formed, followed by reoxidation to Cu2+ by O-2. However, at a high CuCl2 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 TiO2 to Cu2+ 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 CuCl2 was increased by approximately 4 times.
机译：在文献中报道了Cu2 +离子对水中有机污染物的TiO2光催化降解的影响，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Cu2 +浓度，TiO2结构和光强度的影响。随着CuCl2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CuCl 2置于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，也检测到高CuCl2负荷，也检测到金属Cu。利用锐钛矿和P25膜电极的开放电路电位测量显示，从辐照的TiO 2至Cu2 +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，金红石在金红石上的相关量子产率提高了约4倍。

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