Novel AgBr/Ag3PO4 Decorated Ceria Nanoflake Composites for Enhanced Photocatalytic Activity toward Dyes and Bacteria under Visible Light
Novel AgBr/Ag3PO4 Decorated Ceria Nanoflake Composites for Enhanced Photocatalytic Activity toward Dyes and Bacteria under Visible Light
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DOI：
10.1021/acs.iecr.5b01993
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发表时间：
2015-08-26
影响因子：
4.2
通讯作者：
Madras, Giridhar
中科院分区：
文献类型：
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作者：
Eswar, Neerugatti Krishna Rao;Katkar, Venktesh V.;Madras, Giridhar
本研究的目的是开发多相可见光活性的光催化剂，使用AgBr和Ag 3 PO 4使用CeO 2纳米片作为有效的基板。以抗坏血酸为燃料，采用溶液燃烧法制备了氧化铈纳米片。将AgBr和Ag 3 PO 4修饰在CeO 2上，制备了AgBr/Ag 3 PO 4/CeO 2纳米复合材料。通过X射线衍射分析确定了复合材料的结构。使用电子显微镜技术揭示了新的片状形态。与原始的二氧化铈纳米颗粒相比，该纳米复合材料在可见光下表现出优异的光催化活性。纳米复合催化剂颗粒降解阴离子和阳离子染料。它在可见光下也表现出有效的抗菌活性。采用X射线衍射分析、漫反射光谱、电子显微镜、BET比表面积分析和X射线光电子能谱对AgBr/Ag 3 PO 4/CeO 2纳米复合材料进行了表征，并阐明了其光催化活性增强的原因。通过光致发光分析，在二氧化铈上存在银基半导体显示出减少电荷复合，这归因于增强的光催化活性。AgBr/Ag 3 PO 4/CeO 2纳米复合材料在多次重复循环后表现出稳定的性能。
The aim of this study was to develop heterogeneous visible light active photocatalysts using AgBr and Ag3PO4 using CeO2 nanoflakes as an efficient substrate. Ascorbic acid was employed as a fuel to synthesize fine ceria nanoflakes by a facile solution combustion process. AgBr and Ag3PO4 were decorated on ceria to prepare AgBr/Ag3PO4/ceria nanocomposites. The structure of the composite was determined by X-ray diffraction analysis. Novel flakelike morphology was revealed using electron microscopy techniques. The nanocomposites exhibit excellent photocatalytic activity under visible light compared to pristine ceria nanoparticles. The nanocomposite catalyst particles degraded both anionic and cationic dyes. It also exhibited efficient antimicrobial activity under visible light. The AgBr/Ag3PO4/ceria nanocomposite was characterized using X-ray diffraction analysis, diffuse reflectance spectroscopy, electron microscopy, BET surface area analysis, and X-ray photoelectron spectroscopy, and the reasons for enhanced photocatalytic activity were elucidated. The presence of silver based semiconductors on ceria has shown to decrease charge recombination through photoluminescence analysis that attributed for enhanced photocatalytic activity. The AgBr/Ag3PO4/ceria nanocomposite has shown a stable performance after many repeated cycles.