Multi-component Ag/AgCl/Bi2O3/BiFeO3 for the sunlight-induced photocatalytic degradation
Multi-component Ag/AgCl/Bi2O3/BiFeO3 for the sunlight-induced photocatalytic degradation
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DOI：
10.1016/j.jece.2022.107280
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发表时间：
2022-02-10
影响因子：
7.7
通讯作者：
Chen, Lijun
中科院分区：
文献类型：
--
作者：
Li, Yinghua;Yin, Wenyue;Chen, Lijun
采用简单的共沉淀法和超声化学法制备了Ag/AgCl/Bi 2 O3/BiFeO 3复合光催化剂，并对其光催化性能进行了研究。采用X射线衍射（XRD）、扫描电子显微镜-能谱（SEM-EDS）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）对Ag/AgCl/Bi 2 O3/BiFeO 3复合光催化剂的晶体结构、形貌和元素组成进行了表征。用紫外-可见漫反射光谱和光致发光谱研究载流子迁移和分离。XPS表明Ag单体被成功地还原出来。以盐酸左氧氟沙星为目标物，模拟太阳光（全光谱氙灯）照射，考察了复合材料的光催化活性。结果表明，在制备体系pH为8，反应液pH为7，Ag+浓度为0.1mol/L（负载量为44.3wt%）时，复合光催化剂具有最高的光催化活性，循环5次后仍具有良好的光催化活性。与Bi 2 O3/BiFeO 3和Ag/ AgCl相比，Ag/AgCl/Bi 2 O3/BiFeO 3具有更好的光催化活性。此外，通过自由基清除实验和电子自旋共振分析，确定了在反应体系中起作用的活性基团为. O2（-）、h（+）和中心点OH，并提出了Ag/AgCl/Bi 2 O3/BiFeO 3的可能催化机理。
Ag/AgCl/Bi2O3/BiFeO3 composite photocatalysts were synthesized by a simple co-precipitation and sonochemical method, and their photocatalytic properties were investigated. The crystal structure, morphology, and elemental composition of the Ag/AgCl/Bi2O3/BiFeO3 composite photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy spectroscopy (SEM-EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS). Carrier migration and separation studied by Uv-vis DRS and PL spectroscopy. XPS showed that Ag monomers were successfully reduced out. The photocatalytic activity of the composites was investigated by simulating sunlight (full-spectrum xenon lamp irradiation) irradiation of levofloxacin hydrochloride. The results showed that the composite photocatalyst had the highest photocatalytic activity at pH 8 of the prepared system, pH 7 of the reaction solution and Ag+ concentration of 0.1 mol/L (44.3 wt% loading), and still had good photocatalytic activity after five cycles. Compared with Bi2O3/BiFeO3 and Ag/ AgCl, Ag/AgCl/Bi2O3/BiFeO3 exhibited better photocatalytic activity. In addition, based on the radical scavenging experiments and electron spin resonance analysis, .O2(-), h(+) and center dot & nbsp;OH were the reactive groups that played a role in the reaction system, and a possible catalytic mechanism of Ag/AgCl/Bi2O3/BiFeO3 was proposed.