Insight on the plasmonic Z-scheme mechanism underlying the highly efficient photocatalytic activity of silver molybdate/silver vanadate composite in rhodamine B degradation
Insight on the plasmonic Z-scheme mechanism underlying the highly efficient photocatalytic activity of silver molybdate/silver vanadate composite in rhodamine B degradation
复制标题
深入了解钼酸银/钒酸银复合材料在罗丹明 B 降解中高效光催化活性的等离子体 Z 型机制
DOI：
10.1016/j.jcis.2018.04.031
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发表时间：
2018
影响因子：
9.9
通讯作者：
Xiong Ting
中科院分区：
文献类型：
--
作者：
Xie Yingcong;Dai Youzhi;Yuan Xingzhong;Jiang Longbo;Zhou Lulu;Wu Zhibin;Zhang Jin;Wang Hou;Xiong Ting
采用沉积-沉淀法制备了不同Ag 2 MoO 4摩尔比的新型等离子体Z型Ag 2 MoO 4/Ag 3VO 4光催化剂。通过X射线衍射、傅里叶变换红外光谱、扫描电子显微镜、透射电子显微镜、X射线光电子能谱和紫外-可见漫反射光谱分析对样品的形貌、结构和光谱特性进行了表征。在可见光照射下，考察了所合成的光催化剂对罗丹明B（RhB）的光催化降解性能。结果表明，5%Ag2MoO4/Ag 3VO 4复合材料的光催化活性最高，6 min内RhB去除率可达93%。5%Ag2MoO4/Ag 3VO 4复合材料对RhB的去除率高于前驱体Ag 2 MoO 4和Ag 3VO 4化合物。Ag纳米粒子在Ag 2 MoO 4/Ag 3VO 4表面的形成导致了Ag 2 MoO 4/Ag 3VO 4异质结向Ag 2 MoO 4/Ag/Ag 3VO 4 Z型体系的转变，从而提高了光催化活性。Z型Ag 2 MoO 4/Ag/Ag 3VO 4复合材料能有效促进电荷转移，提高氧化还原能力，抑制Ag 3VO 4光腐蚀。产生的活性自由基dotO 2 −、h+和dotOH对RhB的降解至关重要。本研究为开发新型可见光催化材料及其在环境治理中的应用提供了有益的参考。
A facile deposition–precipitation method was applied to synthesize novel plasmonic Z-scheme Ag2MoO4/Ag3VO4photocatalysts with different molar ratios of Ag2MoO4. The morphological, structural, and spectroscopic properties of the as-obtained samples were characterized through X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectral analysis. The photocatalytic performance of the synthesized photocatalysts in rhodamine B (RhB) degradation under visible light irradiation was evaluated. The 5% Ag2MoO4/Ag3VO4composite displayed the highest photocatalytic activity among all samples and the RhB removal rate of 93% within 6 min. The RhB removal rate of 5% Ag2MoO4/Ag3VO4composite was higher than that of precursor Ag2MoO4and Ag3VO4compounds. The formation of Ag nanoparticles (Ag NPs) on the surface of Ag2MoO4/Ag3VO4during photocatalysis resulted in the transformation of the Ag2MoO4/Ag3VO4heterojunction to the Ag2MoO4/Ag/Ag3VO4Z-scheme system, thus enhancing photocatalytic activity. Z-scheme Ag2MoO4/Ag/Ag3VO4composites could efficiently facilitate charge transfer, promote redox ability, and restrain Ag3VO4photocorrosion. The produced active speciesradical dotO2−, h+, andradical dotOH are vital for RhB degradation. The present work could benefit the development of advanced visible-light photocatalytic materials with future applications in environmental remediation.