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ZnO-ZnTe hierarchical superstructures as solar-light-activated photocatalysts for azo dye removal
Environmental Research ( IF 8.3 ) Pub Date : 2020-11-21 , DOI: 10.1016/j.envres.2020.110499
Nadeem Raza , Waseem Raza , Hajera Gul , Ki-Hyun Kim

The excessive amount of textile effluents disposed into the water streams is a common source of contamination of the hydrosphere. To efficiently remove pollutants in water bodies, there is growing demand for highly efficient, cost effective, and green remediation techniques. In line with such demand, a heterostructured photocatalyst (ZnO-ZnTe) has been prepared through the assembly of zinc oxide (ZnO) and zinc telluride (ZnTe). A synergistic interaction between surface adsorption and photocatalysis was explored for the removal of azo dye using a hierarchical superstructure under solar-light irradiation. Methylene blue (MB) was bleached by about 91% under visible irradiation for 2 h to support the role of the prepared heterostructures as effective photocatalysts (QY is 3.16 × 10-5 molecules/photon). Moreover, the kinetic reaction rate of ZnO-ZnTe superstructures was 19.0 μmol g-1 h-1, which was 1.54 and 1.97 times higher than those of pristine ZnO and ZnTe, respectively. These results may be ascribed to the presence of a common cation that may have helped in the diffusion of photogenerated electrons between ZnO and ZnTe, while efficiently suppressing the recombination frequency of photogenerated electrons and holes.



中文翻译:

ZnO-ZnTe分层超结构作为太阳光活化光催化剂,用于去除偶氮染料

放置在水流中的过量纺织品废水是水圈污染的常见来源。为了有效地去除水体中的污染物,对高效,成本有效和绿色修复技术的需求不断增长。为了满足这种需求,已经通过组装氧化锌(ZnO)和碲化锌(ZnTe)来制备异质结构光催化剂(ZnO-ZnTe)。探索了表面吸附和光催化之间的协同相互作用,用于在日光照射下使用分层上层结构去除偶氮染料。亚甲基蓝(MB)在可见光照射下漂白约91%2小时,以支持所制备的异质结构作为有效的光催化剂的作用(QY为3.16×10 -5分子/光子)。此外,ZnO-ZnTe超结构的动力学反应速率为19.0μmolg -1 h -1,分别比原始ZnO和ZnTe高1.54和1.97倍。这些结果可能归因于共阳离子的存在,该共阳离子可能有助于光生电子在ZnO和ZnTe之间扩散,同时有效地抑制了光生电子与空穴的复合频率。

更新日期:2020-11-21
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