Improved solar-driven photocatalytic performance of Ag3PO4/ZnO composites benefiting from enhanced charge separation with a typical Z-scheme mechanism
Improved solar-driven photocatalytic performance of Ag3PO4/ZnO composites benefiting from enhanced charge separation with a typical Z-scheme mechanism
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DOI：
10.1007/s00339-015-9516-2
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Zhong;Jianzhang Li;Tao Wang;Jun Zeng;Yujun Si;Chaozhu Cheng;Minjiao Li;Pei Wang;Jie Ding-Jie-D
中科院分区：
文献类型：
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作者：
J. Zhong;Jianzhang Li;Tao Wang;Jun Zeng;Yujun Si;Chaozhu Cheng;Minjiao Li;Pei Wang;Jie Ding-Jie-D
采用沉淀法制备了不同Ag/Zn摩尔比的模拟太阳能光催化剂Ag 3 PO 4/ZnO，并通过X射线衍射、紫外-可见漫反射光谱、扫描电子显微镜、能量色散谱和表面光电压（SPV）谱对催化剂进行了表征。在模拟太阳光照射下，Ag 3 PO 4/ZnO复合材料对罗丹明B（RhB）水溶液的光催化脱色活性明显高于纯ZnO，其中Ag/Zn摩尔比为4%的Ag 3 PO 4/ZnO复合材料的活性最高。清除剂的猝灭效应表明O2-在RhB脱色中起主要作用。SPV结果表明，Ag 3 PO 4沉积在ZnO表面可以提高光生载流子的分离速率。基于所有的观察，电荷分离机制与一个典型的Z-方案提出。
In this work, efficient simulated solar-driven Ag3PO4/ZnO photocatalysts with different molar ratios of Ag/Zn have been prepared by a precipitation method and characterized by X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy and surface photovoltage (SPV) spectroscopy. Under simulated sunlight illumination, the Ag3PO4/ZnO composites exhibit enhanced photocatalytic activity compared with the pure ZnO toward the decolorization of rhodamine B (RhB) aqueous solution, and the Ag3PO4/ZnO composite with 4 % Ag/Zn molar ratio exhibits the highest activity. The quenching effects of scavengers indicate that O2∙−plays the major role in RhB decolorization. Ag3PO4deposited on the ZnO surface can promote the separation rate of photoinduced charge carriers, proven by the SPV results. Based on all the observations, the charge separation mechanism with a typical Z-scheme was proposed.