ZnO/g-C3N4异质结光催化材料的制备及对吡啶的降解
Preparation of ZnO/g-C3N4 heterojunction photocatalytic material and its degradation of pyridine
唐贝1
作者信息
- 1. 河南应用技术职业学院,河南郑州 450042
- 折叠
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.
Abstract
The ZnO/g-C3N4 heterojunction photocatalytic materials were prepared by evaporation solvent-high temperature thermal polymerization method.They were systematically characterized by XRD,FTIR,TEM,XPS,UV-vis DRS,PL,TPC and EIS.The activity and stability of ZnO/g-C3N4 photocatalytic degradation of pyridine were evaluated.The effects of differ-ent factors on the photocatalytic performance were investigated by L9(34)orthogonal experiment,and the photocatalytic mechanism was discussed.XPS and TEM results proved the formation of heterojunction between ZnO and g-C3N4.The forma-tion of heterojunction effectively promoted the separation of photoelectron-holes,improved the light absorption and broad-ened the spectral range.Under the conditions of ZnO/g-C3N4 composite photocatalyst dosage of 50 mg,ZnO/g-C3N4 mass ra-tio of 1∶2,pyridine initial concentration of 20 mg/L and system pH of 7.0,the photocatalytic degradation rate of pyridine by ZnO/g-C3N4 reached 98.9%after visible light irradiation for 60 min,and the photocatalytic degradation rate was 97.3%af-ter 5 cycles,which had good stability.The photocatalytic degradation of pyridine by ZnO/g-C3N4 was mainly dependent on the action of superoxide radicals(·O2-)and holes(h+).
关键词
ZnO/g-C3N4/光催化/异质结/吡啶Key words
ZnO/g-C3N4/photocatalysis/heterojunction/pyridine引用本文复制引用
基金项目
河南省职业教育教学改革研究与实践项目(2022)(豫教[2023]02979)
河南应用技术职业学院校级项目(2022-KJ-50)
河南应用技术职业学院青年骨干教师资助项目(2022-GGJS-H006)
出版年
2024
NETL
NSTL
万方数据