化工环保2024，Vol.44Issue(6)：859-867,9.DOI:10.3969/j.issn.1006-1878.2024.06.014
CQDs/C3N5复合催化剂光催化氧化去除NO
Photocatalytic removal of NO by CQDs/C3N5 composite catalyst
摘要
Abstract
C3N5/carbon quantum dots(CQDs)composite photocatalysts were prepared by impregnation method with CQDs and C3N5 as raw materials.The obtained photocatalysts were characterized by various means,and the photocatalytic oxidation of NO by CQDs/C3N5 and its reaction mechanism were investigated.The characterization results show that the CQDs nanoparticles are uniformly dispersed on the C3N5 surface without agglomeration.The band gap structure of CQDs/C3N5 was changed compared with that of C3N5,exhibiting stronger optical response and higher carrier separation efficiency.The NO removal rate is 77.9%after photocatalytic oxidation by CQDs-8/C3N5(CQDs/C3N5 mass ratio of 8%)at a mass-hollow speed velocity(WHSV)of 1.2×106 mL/(g·h)and a photoreaction time of 30 min.The CQDs-8/C3N5 has ideal humidity resistance,reusability,and operation stability.The main active species in photocatalytic oxidation of NO by the CQDs-8/C3N5 are·O2-,·OH,photogenerated electrons,and holes.The reaction mechanism is as follows:under light conditions,CQDs/C3N5 are excited to produce electrons and holes;the electrons are transferred to the conduction band and combined with O2 molecules to produce·O2-,or to reduce NO and NO2 to NO-and NO2-;the holes are transferred to the valence band to promote·OH production,which then oxidizes NO to NO2;and the reaction of NO and NO2 with·O2-produces NO3-.关键词
C3N5/碳量子点/光催化/NO/载流子分离Key words
C3N5/carbon quantum dots(CQDs)/photocatalysis/NO/carriers separation分类
资源环境引用本文复制引用
叶杞宏,黄汉源,杨婧羚..CQDs/C3N5复合催化剂光催化氧化去除NO[J].化工环保,2024,44(6):859-867,9.基金项目
国家自然科学基金项目(22006051) （22006051）
广东省自然科学基金面上项目(2022A1515010655) （2022A1515010655）
广东省"珠江人才计划"青年拔尖人才项目(2021QN020272). （2021QN020272）
