无机盐工业 ›› 2024, Vol. 56 ›› Issue (4): 133-142.doi: 10.19964/j.issn.1006-4990.2023-0527
收稿日期:
2023-11-06
出版日期:
2024-04-10
发布日期:
2024-04-18
作者简介:
唐贝(1984— ),女,硕士,讲师,主要从事有机化学和药物化学及光催化材料开发工作;E-mail:smsmgv01@163.com。
基金资助:
Received:
2023-11-06
Published:
2024-04-10
Online:
2024-04-18
摘要:
采用蒸发溶剂-高温热聚合法制备了ZnO/g-C3N4异质结光催化材料,采用XRD、FTIR、TEM、XPS、UV-vis DRS、PL、TPC和EIS等表征技术对其进行了详细系统的表征,评价了ZnO/g-C3N4光催化降解吡啶的活性和稳定性,采用L9(34)正交实验考察了不同因素对光催化性能的影响,并对光催化机理进行了探讨。XPS和TEM结果证明了ZnO和g-C3N4之间异质结的形成,异质结的形成有效促进了光电子-空穴的分离,提高了光吸收,拓宽了光谱范围。在ZnO/g-C3N4复合光催化剂投加量为50 mg、ZnO与g-C3N4质量比为1∶2、吡啶初始质量浓度为20 mg/L和体系pH为7.0的条件下,可见光照射60 min后ZnO/g-C3N4对吡啶的光催化降解率达到了98.9%,循环使用5次后光催化降解率为97.3%,具有良好的稳定性。ZnO/g-C3N4光催化降解吡啶主要依赖于活性基团超氧自由基(·O2-)和空穴(h+)的作用。
中图分类号:
唐贝. ZnO/g-C3N4异质结光催化材料的制备及对吡啶的降解[J]. 无机盐工业, 2024, 56(4): 133-142.
TANG Bei. Preparation of ZnO/g-C3N4 heterojunction photocatalytic material and its degradation of pyridine[J]. Inorganic Chemicals Industry, 2024, 56(4): 133-142.
表1
正交实验结果
次数 | 因素 | 吡啶降 解率/% | |||
---|---|---|---|---|---|
催化剂投加量/mg | m(ZnO)∶ m(g-C3N4) | 吡啶初始质量 浓度/(mg·L-1) | 体系 pH | ||
1 | 40 | 1∶2 | 10 | 6.0 | 92.3 |
2 | 40 | 1∶1 | 20 | 7.0 | 92.1 |
3 | 40 | 1∶3 | 30 | 8.0 | 89.8 |
4 | 50 | 1∶2 | 20 | 8.0 | 96.2 |
5 | 50 | 1∶1 | 30 | 6.0 | 89.6 |
6 | 50 | 1∶3 | 10 | 7.0 | 90.5 |
7 | 60 | 1∶2 | 30 | 7.0 | 91.3 |
8 | 60 | 1∶1 | 10 | 8.0 | 86.7 |
9 | 60 | 1∶3 | 20 | 6.0 | 89.5 |
验证 | 50 | 1∶2 | 20 | 7.0 | 98.9 |
均值1 | 91.400 | 93.267 | 89.833 | 90.467 | |
均值2 | 92.100 | 89.467 | 92.600 | 91.300 | |
均值3 | 89.167 | 89.933 | 90.233 | 90.900 | |
极差 | 2.933 | 3.800 | 2.767 | 0.833 |
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