氮空位g-C_(3)N_(4)的合成及其光催化性能研究  

Preparation of g-C_(3)N_(4)with nitrogen vacancy and study on its photocatalytic performance

作　　者：王丽敏 胡海娜 邹丽飞 王聪莹 WANG Li-min;HU Hai-na;ZOU Li-fei;WANG Cong-ying(College of Chemistry and Life Sciences,Chifeng University,Chifeng 024000,China;College of Resources,Environment and Architecture Engineering,Chifeng University,Chifeng 024000,China)

机构地区：[1]赤峰学院化学与生命科学学院,内蒙古赤峰024000 [2]赤峰学院资源环境与建筑工程学院,内蒙古赤峰024000

出　　处：《现代化工》2025年第4期136-140,共5页Modern Chemical Industry

基　　金：国家自然科学基金(22361001);内蒙古自治区高等学校科学技术研究项目(NJZY23039);自治区级大学生创新创业训练计划项目(S202310138022)。

摘　　要：为改善石墨相氮化碳(g-C_(3)N_(4))光响应范围窄、光生电子-空穴复合率高等缺点,增强其光催化性能,以三聚氰胺为前驱体制备了g-C_(3)N_(4),并将其与不同质量分数的氯化铵混合,在空气气氛中热处理制备缺陷态g-C_(3)N_(4)。结合XRD、IR、EPR、UV-Vis DRS、EIS和光电流等多种表征手段分析催化剂的结构和性质。结果表明,在氯化铵与三聚氰胺质量比为12.5的条件下得到的催化剂具有最佳的光催化活性,在75 min内去除了100%的盐酸四环素(20.0 mg/L),而且经过5次降解循环后效率没有明显变化。活性物种捕获实验表明,降解过程中·O_(2)^(-)和h^(+)是活性物种。To address the narrow light response range and high photocarrier recombination rate of graphite phase carbon nitride(g-C_(3)N_(4)),and enhance its photocatalytic performance,g-C_(3)N_(4) is prepared by using melamine as a precursor,and mixed with ammonium chloride with varying mass fractions,subsequently heat-treated in an air atmosphere to prepare defective g-C_(3)N_(4).The structure and properties of the defective g-C_(3)N_(4) catalyst are thoroughly analyzed by means of a variety of characterization techniques,including XRD,IR,EPR,UV-Vis DRS,EIS and photocurrent test.It is found that the catalyst obtained at an ammonium chloride to melamine mass ratio of 12.5 exhibits the highest photocatalytic activity,which can remove 100%of tetracycline hydrochloride(20.0 mg·L^(-1))within 75 minutes,while maintaining consistent efficiency after 5 degradation cycles.Results from active species capture experiments indicates that the active species involved in the degradation process are·O_(2)^(-)and h^(+).

关 键 词：氯化铵 石墨相氮化碳 氮空位 光催化 盐酸四环素 

分 类 号：O643.32[理学—物理化学]