无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2024, Vol. 56 ›› Issue (4): 133-142.doi: 10.19964/j.issn.1006-4990.2023-0527

• 催化材料 • 上一篇    下一篇

ZnO/g-C3N4异质结光催化材料的制备及对吡啶的降解

唐贝()   

  1. 河南应用技术职业学院,河南 郑州 450042
  • 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:
    2022年河南省职业教育教学改革研究与实践项目:高职院校产业学院建设及人才培养模式探究(豫教[2023]02979);河南应用技术职业学院校级课题(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)

Preparation of ZnO/g-C3N4 heterojunction photocatalytic material and its degradation of pyridine

TANG Bei()   

  1. Henan Vocational College of Applied Technology,Zhengzhou 450042,China
  • 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。

关键词: ZnO/g-C3N4, 光催化, 异质结, 吡啶

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 different 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 formation of heterojunction effectively promoted the separation of photoelectron-holes,improved the light absorption and broadened the spectral range.Under the conditions of ZnO/g-C3N4 composite photocatalyst dosage of 50 mg,ZnO/g-C3N4 mass ratio 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% after 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+).

Key words: ZnO/g-C3N4, photocatalysis, heterojunction, pyridine

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