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首页> 外文期刊>RSC Advances >Brookite TiO2 photocatalyzed degradation of phenol in presence of phosphate, fluoride, sulfate and borate anions
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Brookite TiO2 photocatalyzed degradation of phenol in presence of phosphate, fluoride, sulfate and borate anions

机译：在磷酸盐，氟化物，硫酸盐和硼酸盐阴离子存在下，Broughite TiO2光催化降解苯酚

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摘要

The effects of common inorganic anions on the photocatalytic degradation of organic pollutants over anatase and rutile TiO _(2) in aqueous solution have been widely investigated in the literature. In this work, we report a positive effect of phosphate, fluoride, sulfate and borate anions on the photocatalytic degradation of phenol and 2,4-dichlorophenol over brookite TiO _(2) in aqueous suspensions. In all cases, the rate of phenol degradation over brookite was first-order. Such anion-induced rate enhancement of phenol degradation changed with the initial pH and anion concentration of the suspension, and had a positive correlation with the amount of anions adsorbed on brookite. Moreover, these anions also showed a positive effect on the formation of coumarin–OH adduct, a fluorescent probe of OH radicals. However, upon the addition of these anions, the brookite photocatalyzed formation and decomposition of H _(2) O _(2) in aqueous suspensions were all inhibited, ascribed to decrease in the amount of O _(2) and H _(2) O _(2) adsorption on brookite, respectively. A possible mechanism responsible for the observed effect of these anions is discussed.
机译：在文献中，广泛研究了常见的无机阴离子对锐钛矿和金红石TiO _（2）的有机污染物的光催化降解的影响。在这项工作中，我们报告了磷酸盐，氟，硫酸盐和硼酸盐阴离子对苯酚和2,4-二氯苯酚的光催化降解在水悬浮液中的光催化降解。在所有情况下，Brountite对Brountation的苯酚降解率是一流的。这种阴离子诱导的速率增强酚类降解的初始pH和阴离子浓度的悬浮液变化，并且与吸附在Broughite上的阴离子的阳性相关性呈正相关。此外，这些阴离子还对CoMarin-OH加合物的形成，OH自由基的荧光探针表现出积极影响。但是，在添加这些阴离子后，含水悬浮液中的Broughite光催化的形成和分解H_（2）O _（2）均抑制，以降低O _（2）和H _（2） ）o _（2）分别在布鲁克钛矿上吸附。讨论了负责这些阴离子的观察到效果的可能机制。

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