High Piezo-photocatalytic Efficiency of CuS/ZnO Nanowires Using Both Solar and Mechanical Energy for Degrading Organic Dye
High Piezo-photocatalytic Efficiency of CuS/ZnO Nanowires Using Both Solar and Mechanical Energy for Degrading Organic Dye
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DOI：
10.1021/acsami.6b05252
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发表时间：
2016-08-24
影响因子：
9.5
通讯作者：
Xue, Xinyu
中科院分区：
文献类型：
--
作者：
Hong, Deyi;Zang, Weili;Xue, Xinyu
利用太阳能和机械能，实现了CuS/ZnO纳米线对有机污染物的高效压电光催化降解。采用简单的两步湿化学法在不锈钢丝网上制备了CuS/ZnO异质纳米线阵列。由于大的表面积，网支撑的纳米复合材料可以促进有效的光收集，并且还可以容易地从处理的溶液中去除。在太阳光和超声辐照下，CuS/ZnO纳米线均能快速降解水溶液中的亚甲基蓝（MB），并考察了其可回收性。在此过程中，超声辅助可以大大提高光催化活性。这种性能可以归因于异质结的内建电场和ZnO纳米线的压电场的耦合。异质结的内建电场可以有效地分离光生电子/空穴，促进载流子输运。CuS组分可以提高可见光利用率。ZnO纳米线所产生的压电场可以通过驱动光生电子/空穴沿沿着方向迁移来进一步分离它们。目前的研究结果表明，一个新的水污染的解决方案，在工业水平的环境修复的绿色技术。
High piezo-photo catalytic efficiency of degrading organic pollutants has been realized from CuS/ZnO nanowires using both solar and mechanical energy. CuS/ZnO heterostructured nanowire arrays are compactly/vertically aligned on stainless steel mesh by a simple two-step wet-chemical method. The mesh supported nanocomposites can facilitate an efficient light harvesting due to the large surface area and can also be easily removed from the treated solution. Under both solar and ultrasonic irradiation, CuS/ZnO nanowires can rapidly degrade methylene blue (MB) in aqueous solution, and the recyclability is investigated. In this process, the ultrasonic assistance can greatly enhance the photocatalytic activity. Such a performance can be attributed to the coupling of the built-in electric field of heterostructures and the piezoelectric field of ZnO nanowires. The built-in electric field of the heterostructure can effectively separate the photogenerated electrons/holes and facilitate the carrier transportation. The CuS component can improve the visible light utilization. The piezoelectric field created by ZnO nanowires can further separate the photogenerated electrons/holes through driving them to migrate along opposite directions. The present results demonstrate a new water-pollution solution in green technologies for the environmental remediation at the industrial level.