摘要
类石墨相氮化碳(g-C_(3)N_(4))具有廉价易得、易于制备、能带可调的优点,但其比表面积相对较小、结构缺陷多以及光生载流子易复合等缺点限制了它的光催化应用。文中分别以尿素和三聚氰胺作为前驱体制备了g-C_(3)N_(4)(A)和g-C_(3)N_(4)(B),并与Fe_(2)O_(3)构建Fe_(2)O_(3)/g-C_(3)N_(4)复合结构。扫描电子显微镜(SEM)照片显示Fe_(2)O_(3)和g-C_(3)N_(4)(A)复合成紧密的絮状结构,这有利于提高g-C_(3)N_(4)的比表面积。紫外可见漫反射谱显示g-C_(3)N_(4)与Fe_(2)O_(3)复合后,其吸收边发生红移。以上这些变化均有利于增强复合材料的光催化性能。结果表明:10%Fe_(2)O_(3)/90%g-C_(3)N_(4)(A)的光催化效果最好,其降解速率常数是单一相g-C_(3)N_(4)(A)的1.44倍,是单一相g-C_(3)N_(4)(B)的3.71倍,是单一相Fe_(2)O_(3)的2.34倍。
Graphite-like carbon nitride(g-C_(3)N_(4))has the advantages of cheap,accessibility,and adjustable band.However,its relatively small specific surface area,many structural defects and easy combination of photogenerated carriers limit its photocatalytic application.In this paper,g-C_(3)N_(4)(A)and g-C_(3)N_(4)(B)were prepared using urea and melamine as precursors,respectively.Fe_(2)O_(3)/g-C_(3)N_(4) composites were constructed.The SEM images showed that Fe_(2)O_(3) and g-C_(3)N_(4)(A)combined to form a tight flocculent structure,which was conducive to improving the specific surface area of g-C_(3)N_(4).Uv-visible diffuse reflection spectra showed that the absorption edge of Fe_(2)O_(3)/g-C_(3)N_(4) were red shifted,comparing with Fe_(2)O_(3) and g-C_(3)N_(4).The above changes were beneficial to enhance the photocatalytic performance of the composites.The results indicated that 10%Fe_(2)O_(3)/90%g-C_(3)N_(4)(A)had the best photocatalytic performance among all materials tested,and its degradation rate constant was 1.44 times that of single phase g-C_(3)N_(4)(A),3.71 times that of single phase g-C_(3)N_(4)(B)and 2.34 times that of single phase Fe_(2)O_(3).
作者
李晶
张赵越
蔡志雄
王晨鹏
马天慧
LI Jing;ZHANG Zhaoyue;CAI Zhixiong;WANG Chenpeng;MA Tianhui(School of Material Science and Engineering,Heilongjiang Institute of Technology,Harbin 150050,China)
出处
《黑龙江工程学院学报》
2025年第1期1-8,28,共9页
Journal of Heilongjiang Institute of Technology
基金
黑龙江省省属高等学校基本科研业务费科研项目(021GJ03)
黑龙江省重点研发计划指导类项目(GZ20210140)
黑龙江省级大学生创新创业项目(S202211802012X,S202211802036)。
作者简介
第一作者:李晶(2002-),女,本科生,研究方向:光催化;通信作者:马天慧(1972-),女,教授,研究方向:光催化.
