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首页> 外文期刊>Building and Environment >Visible-light-induced photocatalysis of low-level methyl-tertiary butyl ether (MTBE) and trichloroethylene (TCE) using element-doped titanium dioxide
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Visible-light-induced photocatalysis of low-level methyl-tertiary butyl ether (MTBE) and trichloroethylene (TCE) using element-doped titanium dioxide

机译：掺杂元素二氧化钛的可见光诱导低级甲基叔丁基醚（MTBE）和三氯乙烯（TCE）的光催化

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While the photocatalytic degradation of various volatile organic compounds in conjunction with UV light has been widely reported, visible-light-induced photocatalytic degradation of low-levels of the poltut-ants MTBE and TCE, which have been linked to potential adverse health effects, is rarely reported. The present study examined whether visible-light-activated S- or N-doped TiO_2 photocatalytic technology can be used to control indoor concentrations of MTBE and TCE. This study consists of the characterization of the doped TiO_2 powders, as well as an investigation of their photocatalytic activities. In regards to both powders, a shift of the absorbance spectrum towards the visible light region was observed. An activity test suggested that these photocatalysts exhibited reasonably high degradation efficiencies towards MTBE and TCE under visible light irradiation. The degradation efficiencies of MTBE and TCE by S- and N-doped photocatalysts exceeded 75 and 80%, respectively, at input concentrations (IC) of 0.1 ppm. Degradation efficiency was dependent on both IC and relative humidity. TCE could enhance the degradation efficiency of MTBE even under visible-light irradiation. The estimated mineralization efficiencies (MEs) were comparable to those of previous studies conducted with UV/TiO_2 systems. Similar to the relative degradation efficiencies, the ME of TCE was higher in comparison to that of MTBE. The CO production measured during the photocatalytic processes represented a negligible addition to indoor CO levels. These results suggest that visible-light-activated S- and N-doped TiO_2 photocatalysts may prove a useful tool in the effort to improve indoor air quality.
机译：尽管已经广泛报道了各种挥发性有机化合物与紫外线的光催化降解，但可见光诱导的低水平污染物MTBE和TCE的光催化降解已与潜在的不良健康影响相关联。很少报道。本研究研究了可见光活化的S或N掺杂的TiO_2光催化技术是否可用于控制室内MTBE和TCE的浓度。这项研究包括掺杂的TiO_2粉末的表征以及对其光催化活性的研究。关于两种粉末，观察到吸收光谱向可见光区域移动。活性测试表明，这些光催化剂在可见光照射下对MTBE和TCE表现出相当高的降解效率。在0.1 ppm的输入浓度（IC）下，S和N掺杂的光催化剂对MTBE和TCE的降解效率分别超过75％和80％。降解效率取决于IC和相对湿度。即使在可见光照射下，TCE也可以提高MTBE的降解效率。估计的矿化效率（MEs）与先前使用UV / TiO_2系统进行的研究相当。与相对降解效率相似，与MTBE相比，TCE的ME更高。在光催化过程中测得的一氧化碳产生量与室内一氧化碳水平相比可忽略不计。这些结果表明，可见光活化的S和N掺杂的TiO_2光催化剂可能是改善室内空气质量的有用工具。

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