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New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation

机译：通过调节自由基生成策略对RhB的选择性光催化氧化的新见解

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Rhodamine B (RhB) has often been used as a model pollutant, but its photocatalytic mechanism is still controversial. Herein, Ag NPs were sandwiched between CdS QDs and amorphous-TiO _(2) (a-TiO _(2) ) with the intent to build a CdS/Ag/a-TiO _(2) catalyst with highly selective oxidation activity. When rhodamine B (RhB) was used as the model organic compound, the CdS/Ag/a-TiO _(2) composite can not only modulate radical generation but also improve the conversion ratio of RhB to rhodamine 110 (Rh-110) to as high as 82% at 80?min during the visible-light irradiation. A series of the radical scavenging experiments revealed that CdS/Ag/a-TiO _(2) composites could modulate the effects of hydroxyl radicals (·OH) and superoxide anion radicals (·O _(2) ~(?) ) at different reaction stages so that the overoxidation of RhB and Rh-110 were repressed. Therefore, the transient state protection mechanism of selective oxidation of RhB was proposed to explain the reaction selectivity for Rh-110. Although the effects of both ·O _(2) ~(?) and ·OH are important during the photocatalytic selective oxidation of RhB, it is shown that the selective oxidation of RhB would be performed when the effect of ·O _(2) ~(?) is bigger than the ·OH, if not, RhB would be oxidized unselectively. Meanwhile, this may provide a new strategy for modulating radical generation in the photocatalysis of water phases.
机译：罗丹明B（RhB）经常被用作模型污染物，但其光催化机理仍存在争议。在此，Ag NPs被夹在CdS QD和非晶TiO _（2）（a-TiO _（2））之间，目的是构建具有高选择性氧化活性的CdS / Ag / a-TiO _（2）催化剂。当将罗丹明B（RhB）用作模型有机化合物时，CdS / Ag / a-TiO _（2）复合材料不仅可以调节自由基的生成，而且可以提高RhB向罗丹明110（Rh-110）的转化率。在可见光照射下，在80？min时高达82％。一系列自由基清除实验表明，CdS / Ag / a-TiO _（2）复合材料可以在不同的温度下调节羟基自由基（·OH）和超氧阴离子自由基（·O _（2）〜（？））的作用。反应阶段，从而抑制了RhB和Rh-110的过氧化。因此，提出了RhB选择性氧化的瞬态保护机理来解释Rh-110的反应选择性。尽管·O _（2）〜（？）和·OH的作用在RhB的光催化选择性氧化过程中都很重要，但显示出当·O _（2）的作用时将进行RhB的选择性氧化。 〜（？）比·OH大，否则，RhB会被非选择性氧化。同时，这可能为调节水相光催化中自由基的产生提供新的策略。

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