SiO2 优化制备及其光催化活性研究

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《长江大学学报》（自科版）[ISSN:1673-1409/CN:42-1741/N]

Title:: Optimizing Preparation of Ag-AgBr/SiO2 and Study on Improving Photocatalytic Activity

Author(s):: Zhang Yanhui; Tang Hongbin; Dai Rongying; Gao Fei; Minnan Normal University, Zhangzhou 363000

Keywords:: photocatalysis; Ag-AgBr; SiO2; optimizing preparation; photocatalytic activity

摘要:: 以SiO2 为载体,采用沉积沉淀法制备了Ag-AgBr/SiO2 光催化剂,通过优化煅烧温度和煅烧时间得到光催化活性最佳的Ag-AgBr/SiO2 的制备条件:以光催化降解罗丹明B为探针反应,当煅烧温度为773K、煅烧时间为3h时所得Ag-AgBr/SiO2 光催化活性最佳。通过X射线光电子能谱验证了Ag-AgBr/SiO2 表面的Ag物种以0价和+1价存在,并比较了Ag-AgBr、Ag/SiO2 和Ag-AgBr/SiO2 等催化剂的光催化活性,研究发现Ag-AgBr和SiO2 的协同作用能促进催化剂活性的提高和稳定性的增加。为更好地提高光催化活性,还研究了不同截体以及相同载体不同比表面积对光催化活性的影响,表面积更大的SiO2能显著提高光催化活性。

Abstract:: With SiO2 as a carrier, the Ag-AgBr/SiO2 photocatalyst is prepared by deposition-precipitation method. In order to obtain the optimum conditions for the photocatalytic activity of Ag-AgBr/SiO2, the calcination temperature and time are optimized. The photocatalytic degradation of Rhodamine B (RhB) is selected as model reaction, it is demonstrated that the photocatalytic performance of Ag-AgBr/SiO2 is the best at the calcination temperature of 773 K and the calcination time of 3 hours. In addition, the surface Ag species existed as Ag (0) and Ag (I) in Ag-AgBr/SiO2 is confirmed by the analysis of X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of Ag-AgBr, Ag/SiO2 and Ag-AgBr/SiO2 are compared , synergetic effects between Ag-AgBr and SiO2 possessing the ability promote the enhancement of catalyst activity and the extension of stability is observed. The effects of different supports on photocatalytic performance are investigated to significantly improve photocatalytic activity. Besides, the effects of different specific surface area of the same carrier on the photocatalytic activity are also studied, the results show that larger surface areas of SiO2 can obviously improve the photocatalytic activity.

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[2]周浩,周东梅,张燕辉..Mg-M (Al, Fe) 层状双氢氧化物光催化降解环丙沙星试验研究[J].长江大学学报(自科版),2018,15(17):015.
[3]段帅,黄向阳,张英.AgAg2O@Fe3O4磁性材料的制备及光催化性能研究[J].长江大学学报(自科版),2019,16(4):071.

备注/Memo:: [基金项目] 福建省自然科学基金青年创新资助项目(2015J05027); 福建省高校杰出青年科研人才培育计划( 闽教科(2015) 54号); 闽南师范大学杰出青年科研人才培育计划(MJ14004)。 [作者简介] 张燕辉(1986-), 男, 博士, 讲师, 现主要从事光催化方面的教学与研究工作, zhangyh@mnnu.edu.cn。

更新日期/Last Update: 2017-06-30