无机材料学报 ›› 2022, Vol. 37 ›› Issue (7): 750-756.DOI: 10.15541/jim20210685
所属专题: 【能源环境】光催化降解有机分子
收稿日期:
2021-11-08
修回日期:
2021-12-22
出版日期:
2022-07-20
网络出版日期:
2022-01-06
作者简介:
迟聪聪(1981-), 女, 副教授. E-mail: congcongchi@163.com
基金资助:
CHI Congcong(), QU Panpan, REN Chaonan, XU Xin, BAI Feifei, ZHANG Danjie
Received:
2021-11-08
Revised:
2021-12-22
Published:
2022-07-20
Online:
2022-01-06
About author:
CHI Congcong (1981-), female, associate professor. E-mail: congcongchi@163.com
Supported by:
摘要:
光催化是一种绿色且高效的降解染料污染物的方式, 在水污染治理中应用广泛。本研究以SiO2为核层, 依次采用氧化还原法、改进的Stöber法及水热法合成SiO2@Ag@SiO2@TiO2多层核壳结构作为光催化剂用于染料污染物降解, 并探讨了硝酸银(AgNO3)、正硅酸乙酯(TEOS)、钛酸四丁酯(TBOT)等用量对包覆效果的影响。采用不同表征手段对样品的微观形貌、物相结构、孔结构参数和光电性能进行分析表征。结果表明, 当AgNO3、TEOS、TBOT与SiO2的质量比为5 : 2.4 : 6 : 1, 多层核壳结构每层均达到最优包覆效果。与SiO2@TiO2和SiO2@Ag@TiO2催化剂相比较, SiO2@Ag@SiO2@TiO2核壳结构的光催化剂具有更佳的光催化活性, 光照45 min可降解93%的MB溶液, 经4次循环后其光催化效率为90%。
中图分类号:
迟聪聪, 屈盼盼, 任超男, 许馨, 白飞飞, 张丹洁. SiO2@Ag@SiO2@TiO2核壳结构的制备及其光催化降解性能[J]. 无机材料学报, 2022, 37(7): 750-756.
CHI Congcong, QU Panpan, REN Chaonan, XU Xin, BAI Feifei, ZHANG Danjie. Preparation of SiO2@Ag@SiO2@TiO2 Core-shell Structure and Its Photocatalytic Degradation Property[J]. Journal of Inorganic Materials, 2022, 37(7): 750-756.
图2 不同AgNO3/SiO2质量比制备SiO2@Ag微球的SEM照片
Fig. 2 SEM images of SiO2@Ag microspheres prepared with different AgNO3/SiO2 mass ratios (a) 2 : 1; (b) 3 : 1; (c) 4 : 1; (d) 5 : 1
图3 SiO2@Ag微球的(a) STEM照片, (b) 选定区域EDS能谱, (c) TEM照片和(d) HRTEM照片
Fig. 3 STEM image (a), EDS pattern of selected region (b), TEM image (c), and HRTEM image (d) of SiO2@Ag microspheres
图5 不同TEOS/SiO2质量比制备的SiO2@Ag@SiO2微球的SEM照片
Fig. 5 SEM images of SiO2@Ag@SiO2 microspheres prepared with different TEOS/SiO2 mass ratios (a) 0.9 : 1; (b) 1.4 : 1; (c) 1.9 : 1; (d) 2.4 : 1
图6 不同TBOT/SiO2质量比制备SiO2@Ag@TiO2微球的SEM照片
Fig. 6 SEM images of SiO2@Ag@TiO2 microspheres with different TBOT/SiO2 mass ratios (a) 3 : 1; (b) 4 : 1; (c) 5 : 1; (d) 6 : 1; (e) 7 : 1; (f) 8 : 1
图7 SiO2@Ag@SiO2@TiO2微球的(a) TEM照片, (b) EDS能谱, (c) HRTEM照片和(d) O, Si, Ag和Ti的元素分布
Fig. 7 (a) TEM image, (b) EDS pattern, (c) HRTEM image and corresponding elemental mapping of O, Si, Ag and Ti of SiO2@Ag@SiO2@TiO2 microspheres
Sample | SBET/ (m2·g-1) | Pore volume/ (cm3·g-1) | Average pore size/nm |
---|---|---|---|
SiO2 | 18.95 | 0.23 | 56.20 |
SiO2@Ag | 23.87 | 0.38 | 62.78 |
SiO2@Ag@TiO2 | 48.36 | 0.23 | 15.85 |
SiO2@Ag@SiO2@TiO2 | 81.36 | 0.25 | 10.37 |
表1 不同微球的孔结构参数
Table 1 Pore structure parameters of different microspheres
Sample | SBET/ (m2·g-1) | Pore volume/ (cm3·g-1) | Average pore size/nm |
---|---|---|---|
SiO2 | 18.95 | 0.23 | 56.20 |
SiO2@Ag | 23.87 | 0.38 | 62.78 |
SiO2@Ag@TiO2 | 48.36 | 0.23 | 15.85 |
SiO2@Ag@SiO2@TiO2 | 81.36 | 0.25 | 10.37 |
图10 不同样品ln(At/A0)随时间的变化曲线和SiO2@Ag@SiO2@TiO2降解MB的循环测试(插图)
Fig. 10 ln(At/A0)-t curves of different samples and cyclic tests of MB degradation by SiO2@Ag@SiO2@TiO2 (insert)
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