Surface defects decorated zinc doped gallium oxynitride nanowires with high photocatalytic activity
Surface defects decorated zinc doped gallium oxynitride nanowires with high photocatalytic activity
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DOI：
10.1016/j.apcatb.2017.03.004
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发表时间：
2017-07-15
影响因子：
22.1
通讯作者：
Pan, Wei
中科院分区：
文献类型：
--
作者：
Cheng, Jing;Wang, Yuting;Pan, Wei
众所周知，表面缺陷对光催化性能起着重要的作用。缺陷工程已成为开发新型光催化材料的常用方法。本文采用简单的静电纺丝和可控煅烧工艺，在氨气氛下制备了富含表面缺陷的锌掺杂氮化氧化镓纳米线。通过仔细改变氨化温度来调整表面缺陷，从而控制掺杂含量和纳米线的结晶度。该纳米线对罗丹明B有机染料的降解具有较高的光催化活性和良好的稳定性。在可见光照射下，纳米线的表观量子效率可达30%，是表面缺陷较少的纳米线的13倍和8倍左右。结构分析表明，表面氧空位是提高光催化效率的关键因素。因此，光催化活性的增强可归因于表面氧空位上有效的电荷转移。本研究结果将有助于探索用于有机污染物去除的高性能可见光驱动光催化材料的缺陷结构。(C) 2017 Elsevier B.V.版权所有
It is known that surface defect is playing an important role in the photocatalytic performance. Defect engineering has become a common approach in the development of novel photocatalytic materials nowadays. In this paper, zinc doped gallium oxynitride nanowires enriched with surface defects are fabricated via a simple electrospinning and controlled calcination process under ammonia atmosphere. The surface defects are tuned by varying the ammonification temperature carefully, resulting in controlled doping content as well as adjustable crystallinity in the nanowire. The nanowire exhibits high photocatalytic activity and very good stability for the degradation of Rhodamine B organic dye. The apparent quantum efficiency reaches up to 30% under visible light irradiation, which is about 13 and 8 times higher than the nanowires with few surface defects. Structure analysis demonstrates that the surface oxygen vacancy is found to be the key factor for enhancing the photocatalytic efficiency. Hence, the enhanced photocatalytic activity can be attributed to the efficient charge transfer on the surface oxygen vacancy. The results in this work may be beneficial to explore the defective structure for the high performance visible-light driven photocatalytic materials for organic pollutant removal. (C) 2017 Elsevier B.V. All rights reserved.