Photocatalytic performance of Ag2S under irradiation with visible and near-infrared light and its mechanism of degradation
Photocatalytic performance of Ag2S under irradiation with visible and near-infrared light and its mechanism of degradation
复制标题
Ag2S在可见光和近红外光照射下的光催化性能及其降解机制
DOI：
10.1039/c4ra15774e
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Liang, Bin
中科院分区：
文献类型：
--
作者：
Jiang, Wei;Wu, Zhaomei;Liang, Bin
Ag 2S作为复合光催化剂的重要组成部分，虽然被广泛应用，但其本身作为光催化剂的研究很少。我们在室温下通过简单的离子交换法合成了Ag 2S，并将其直接用作有效的光催化剂。我们的研究结果证实了Ag 2S在可见光照射下在30 min内和近红外光照射下在70 min内完全光降解甲基橙子的优异性能。这种良好的性能归因于Ag 2S的窄带隙（1.078 eV）和Ag 2S在光催化过程中光生电子-空穴对的较低复合效率。光氧化过程中的活性物种被确定为阴离子臭氧自由基。这种简单的制备方法和高的光催化性能增加了Ag 2S的应用前景。
Ag2S has only rarely been investigated as a photocatalyst on its own, although it has been widely used as an important component of composite photocatalysts. We synthesized Ag2S by a facile ion-exchange method at room temperature and used it directly as an effective photocatalyst. Our results confirmed the excellent performance of Ag2S in completely photodegrading methyl orange within 30 min under irradiation with visible light and within 70 min under irradiation with near-infrared light. This good performance is ascribed to the narrow band gap (1.078 eV) of Ag2S and the lower recombination efficiency of the photogenerated electron–hole pairs of Ag2S in the photocatalytic process. The active species in the photo-oxidation process was identified as anioic ozone radicals. This simple preparation method and high photocatalytic performance increases the possible future applications of Ag2S.