化工学报 ›› 2022, Vol. 73 ›› Issue (8): 3636-3646.DOI: 10.11949/0438-1157.20220358
收稿日期:
2022-03-10
修回日期:
2022-06-17
出版日期:
2022-08-05
发布日期:
2022-09-06
通讯作者:
牛永安
作者简介:
张鑫(1983—),女,博士,副教授,zhangxin0406@126.com
基金资助:
Xin ZHANG1(), Rui XU1, Xinyu LU1, Yong'an NIU2()
Received:
2022-03-10
Revised:
2022-06-17
Online:
2022-08-05
Published:
2022-09-06
Contact:
Yong'an NIU
摘要:
调整禁带宽度和抑制光生电子-空穴对复合是提高Bi2O3半导体光催化性能的重要途径。首先采用溶液合成和热处理法成功制备了SiO2@Bi2O3核壳微球,研究了投料比、热处理温度等因素来调控核壳组成和包覆效果。为提高光催化活性,采用Cl掺杂改变SiO2@Bi2O3核壳微球壳层的结构、形貌与组成,通过XRD、SEM、TEM等方法确定了微球壳层为BiOCl-Bi24O31Cl10复合物。调整摩尔比、氨水和NaCl用量等参数,优化SiO2@BiOCl-Bi24O31Cl10核壳微球的均匀包覆效果,大幅提高了对罗丹明B(RhB)的光催化降解效率。在此基础上,阐述了SiO2@Bi2O3核壳微球的形成机理和SiO2@BiOCl-Bi24O31Cl10核壳微球的光催化降解机理。
中图分类号:
张鑫, 许蕊, 路馨语, 牛永安. SiO2@BiOCl-Bi24O31Cl10核壳微球的合成及光催化[J]. 化工学报, 2022, 73(8): 3636-3646.
Xin ZHANG, Rui XU, Xinyu LU, Yong'an NIU. Synthesis and photocatalysis of SiO2@BiOCl-Bi24O31Cl10 core-shell microspheres[J]. CIESC Journal, 2022, 73(8): 3636-3646.
样品 | Bi(NO3)3·5H2O/g | SiO2/g | 投料比x |
---|---|---|---|
SB-0.8 | 0.3032 | 0.0500 | 0.8 |
SB-1.0 | 0.4043 | 0.0500 | 1.0 |
SB-1.5 | 0.6065 | 0.0500 | 1.5 |
SB-2.0 | 0.8086 | 0.0500 | 2.0 |
表1 SiO2@Bi2O3样品前体的反应参数
Table 1 Reaction parameters of some SiO2@Bi2O3 sample precursors
样品 | Bi(NO3)3·5H2O/g | SiO2/g | 投料比x |
---|---|---|---|
SB-0.8 | 0.3032 | 0.0500 | 0.8 |
SB-1.0 | 0.4043 | 0.0500 | 1.0 |
SB-1.5 | 0.6065 | 0.0500 | 1.5 |
SB-2.0 | 0.8086 | 0.0500 | 2.0 |
样品 | 氨水/ml | Bi(NO3)3∙5H2O/g | NaCl/g | SiO2∶Bi(NO3)3∙5H2O∶NaCl(摩尔比) |
---|---|---|---|---|
SBC-1 (SBC-1-0.5) | 0.5 | 0.4043 | 0.0488 | 1∶1∶1 |
SBC-2 | 0.5 | 0.4043 | 0.0975 | 1∶1∶2 |
SBC-3 | 0.5 | 0.4043 | 0.1462 | 1∶1∶3 |
SBC-4 | 0.5 | 0.4043 | 0.1950 | 1∶1∶4 |
SBC-1-1 | 1.0 | 0.4043 | 0.0488 | 1∶1∶1 |
SBC-1-2 | 2.0 | 0.4043 | 0.0488 | 1∶1∶1 |
SBC-1-3 | 3.0 | 0.4043 | 0.0488 | 1∶1∶1 |
表2 SiO2@BiOCl-Bi24O31Cl10样品前体的具体投料参数
Table 2 Specific feeding parameters of SiO2@BiOCl-Bi24O31Cl10 sample precursors
样品 | 氨水/ml | Bi(NO3)3∙5H2O/g | NaCl/g | SiO2∶Bi(NO3)3∙5H2O∶NaCl(摩尔比) |
---|---|---|---|---|
SBC-1 (SBC-1-0.5) | 0.5 | 0.4043 | 0.0488 | 1∶1∶1 |
SBC-2 | 0.5 | 0.4043 | 0.0975 | 1∶1∶2 |
SBC-3 | 0.5 | 0.4043 | 0.1462 | 1∶1∶3 |
SBC-4 | 0.5 | 0.4043 | 0.1950 | 1∶1∶4 |
SBC-1-1 | 1.0 | 0.4043 | 0.0488 | 1∶1∶1 |
SBC-1-2 | 2.0 | 0.4043 | 0.0488 | 1∶1∶1 |
SBC-1-3 | 3.0 | 0.4043 | 0.0488 | 1∶1∶1 |
图8 改变氨水添加量(z=0.5,1.0,2.0,3.0)和摩尔比(y=1,2,3,4)得到的SiO2@BiOCl-Bi24O31Cl10(450)的紫外可见吸收光谱图
Fig.8 UV absorption spectra of as-obtained SiO2@BiOCl-Bi24O31Cl10(450) with altered ammonia content (z=0.5,1.0,2.0,3.0) and mole ratio (y=1,2,3,4)
图10 不同热处理温度的SiO2@Bi2O3,不同投料摩尔比的SiO2@BiOCl-Bi24O31Cl10(450)-y和不同氨水添加量的SiO2@BiOCl-Bi24O31Cl10(450)-1-z对RhB的光催化降解曲线和表观速率常数
Fig.10 The photocatalytic degradation curves and apparent rate constants of RhB obtained by SiO2@Bi2O3 with different heat treatment temperatures, SiO2@BiOCl-Bi24O31Cl10(450)-y with different feed mole ratios and SiO2@BiOCl-Bi24O31Cl10(450)-1-z with different ammonia additions
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