Tungsten-based nanomaterials (WO3 & Bi2WO6): Modifications related to charge carrier transfer mechanisms and photocatalytic applications
Tungsten-based nanomaterials (WO3 & Bi2WO6): Modifications related to charge carrier transfer mechanisms and photocatalytic applications
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DOI：
10.1016/j.apsusc.2015.07.003
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发表时间：
2015-11-15
影响因子：
6.7
通讯作者：
Rao, K. S. R. Koteswara
中科院分区：
文献类型：
--
作者：
Kumar, S. Girish;Rao, K. S. R. Koteswara
非均相吸附技术是一种理想的绿色能源技术。虽然二氧化钛作为参考光催化剂占主导地位，但其宽带隙是扩展实用性的瓶颈。因此，近年来，寻找非TiO 2基纳米材料已成为一个活跃的研究领域。在这方面，可见光吸收多晶WO 3（2.4-2.8 eV）和Bi 2 WO 6（2.8 eV）具有多功能的结构-电子特性，以促进光催化反应已经获得了相当大的兴趣。这些材料也探索在有机反应中的选择性官能团转换，因为低的还原和氧化电位的WO 3 CB和Bi 2 WO 6 VB，分别。在这篇集中的评论中，讨论了各种策略，如杂质离子掺杂，贵金属沉积和异质结与其他半导体设计的有效的半导体。这些改性不仅使光响应扩展到更长的波长，而且延长了载流子的寿命并增强了光催化剂的稳定性。强调了与高活性相关的每种改性相关的表面-本体性质和电荷载流子转移动力学的变化。氧化剂的存在下，表面改性与Cu 2+离子和合成暴露的方面，以促进降解速率的突出。对这些纳米材料的深入研究可能会持续对废水治理的兴趣，并设想在各种绿色能源应用中具有重要意义。(C)2015 Elsevier B. V.版权所有。
Heterogeneous photocatalysis is an ideal green energy technology for the purification of wastewater. Although titania dominates as the reference photocatalyst, its wide band gap is a bottleneck for extended utility. Thus, search for non-TiO2 based nanomaterials has become an active area of research in recent years. In this regard, visible light absorbing polycrystalline WO3 (2.4-2.8 eV) and Bi2WO6 (2.8 eV) with versatile structure-electronic properties has gained considerable interest to promote the photocatalytic reactions. These materials are also explored in selective functional group transformation in organic reactions, because of low reduction and oxidation potential of WO3 CB and Bi2WO6 VB, respectively. In this focused review, various strategies such as foreign ion doping, noble metal deposition and heterostructuring with other semiconductors designed for efficient photocatalysis is discussed. These modifications not only extend the optical response to longer wavelengths, but also prolong the life-time of the charge carriers and strengthen the photocatalyst stability. The changes in the surface-bulk properties and the charge carrier transfer dynamics associated with each modification correlating to the high activity are emphasized. The presence of oxidizing agents, surface modification with Cu2+ ions and synthesis of exposed facets to promote the degradation rate is highlighted. In depth study on these nanomaterials is likely to sustain interest in wastewater remediation and envisaged to signify in various green energy applications. (C) 2015 Elsevier B.V. All rights reserved.