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首页> 外文期刊>Journal of Photochemistry and Photobiology, A. Chemistry >Decolourising textile wastewater with modified titania: the effects of inorganic anions on the photocatalysis
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Decolourising textile wastewater with modified titania: the effects of inorganic anions on the photocatalysis

机译：改性二氧化钛使纺织品废水脱色：无机阴离子对光催化的影响

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摘要

In this study, the environment of the TiO_2 photocatalyst modified with silver was investigated. The photocatalytic degradation of textile dye Astrazone Orange G was carried out in the presence and absence of common inorganic salts to determine the effect of the anionic species. It was shown that degradation of dyes in the first 20 min in the presence of anions it was not affected or was promoted in many cases with Ag-loaded TiO_2. In TiO_2/UV system positive charged holes (h~+) might be scavenged by the negatively charged anions and the adsorption of dyes on the surface of TiO_2 was significantly inhibited. However, this inhibition effect was not observed with modified titania and possible mechanism was thought to be the trapping of the conductive band electrons by silver islands producing more positively charged holes as well as the reduction of the band gap energy. Additionally, the adsorption of the dye on the Ag-TiO_2 catalyst surface was significantly increased in the presence of anions and this might be responsible for another promoting effect.
机译：本研究研究了银改性的TiO_2光催化剂的环境。在存在和不存在常见无机盐的条件下，对纺织品染料Astrazone Orange G进行光催化降解，以确定阴离子物质的作用。结果表明，在负载阴离子的情况下，在最初的20分钟内染料的降解不会受到影响，或者在许多情况下，负载Ag的TiO_2会促进染料的降解。在TiO_2 / UV系统中，带负电的阴离子可以清除带正电的空穴（h〜+），并且显着抑制了染料在TiO_2表面的吸附。然而，用改性的二氧化钛未观察到这种抑制作用，并且可能的机理被认为是银岛俘获了导电带电子，银岛产生了更多带正电的空穴以及带隙能量的降低。另外，在阴离子存在下，染料在Ag-TiO_2催化剂表面的吸附显着增加，这可能是另一种促进作用的原因。

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