Ag/Sn_(3)O_(4)微米球的制备及其光催化还原Cr(Ⅵ)  

Preparation of Ag/Sn_(3)O_(4) Microspheres and Their PhotoCatalytic Reduction of Cr(Ⅵ)

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作  者:张树欣 孟祥龙 张梦凡 江燕斌[1,2] 余长林 ZHANG Shuxin;MENG Xianglong;ZHANG Mengfan;JIANG Yanbin;YU Changlin(School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China;School of Chemical Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区:[1]华南理工大学化学与化工学院,广东广州510640 [2]广东石油化工学院化学工程学院,广东茂名525000

出  处:《广东石油化工学院学报》2024年第4期8-14,31,共8页Journal of Guangdong University of Petrochemical Technology

基  金:国家自然科学基金项目(22272034);广东省珠江学者特聘教授资助计划(2019);茂名市科技专项(2023SZX034)。

摘  要:采用一种简单的光沉积的方法制备了一系列Ag/Sn_(3)O_(4)光催化剂,当Ag的质量分数为3%(3%Ag/Sn_(3)O_(4))时,复合光催化剂表现出最佳光催化活性,对10,20 mg/L的Cr(Ⅵ)污染物的降解率分别为87.72%和76.80%。利用紫外可见漫反射光谱(UV-Ⅵs DRS)、扫描电子显微镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等表征手段对Ag/Sn_(3)O_(4)光催化剂进行表征,详细研究了对Cr(Ⅵ)的光催化降解活性和机理。从光致发光(PL)结果可以看出,Ag和Sn_(3)O_(4)组分之间紧密结合改善了电荷的分离和转移,3%Ag/Sn_(3)O_(4)的比表面积、孔体积和反应速率常数k分别是纯Sn_(3)O_(4)的7.3、4.6和1.8倍。该研究用少量Ag负载在Sn_(3)O_(4)上高效降解Cr(Ⅵ)污染物,所得到的催化剂Ag/Sn_(3)O_(4)由于富含Ag的活性位点有效促进了光生载流子的转移。A series of Ag/Sn_(3)O_(4) photocatalysts were prepared by a simple photodeposition method.When the mass fraction of Ag was 3%(3% Ag/Sn_(3)O_(4)),the composite photocatalysts showed the best photocatalytic activity.The degradation rates of Cr(Ⅵ)pollutants at 10 mg/L and 20 mg/L were 87.72% and 76.80%,respectively.The Ag/Sn_(3)O_(4) photocatalyst was characterized by UV-Ⅵs diffuse reflection spectroscopy(UV-ⅥS DRS),scanning electron microscopy(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS),and the photocatalytic degradation activity and mechanism of Cr(Ⅵ)were studied in detail.The photoluminescence(PL)results showed that the tight binding between Ag and Sn_(3)O_(4) components improved charge separation and transfer,and the specific surface area,pore volume and reaction rate constant k of 3% Ag/Sn_(3)O_(4) were 7.3,4.6 and 1.8 times that of pure Sn_(3)O_(4),respectively.In this study,a small amount of Ag is loaded on Sn_(3)O_(4) to efficiently degrade Cr(Ⅵ)pollutants,and the obtained catalyst Ag/Sn_(3)O_(4) effectively promotes photogenic carrier transfer due to the Ag-rich active site.

关 键 词:Ag/Sn_(3)O_(4) 光催化 金属掺杂 降解 

分 类 号:X703[环境科学与工程—环境工程]

 

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