碳量子点修饰氮化碳提高光催化活性  

Enhancing the Photocatalytic Activity of Graphitic Carbon Nitride via Carbon Quantum Dots Modification

作　　者：周建伟[1] 朵芳芳 王储备[1] 李欣 ZHOU Jianwei;DUO Fangfang;WANG Chubei;Li Xin(Institute of Energy and Fuel,Xinxiang University,Xinxiang 453003,China;College of Chemistry and Chemical Engineering,Xinxiang University,Xinxiang 453003,China)

机构地区：[1]新乡学院能源与燃料研究所,河南新乡453003 [2]新乡学院化学化工学院,河南新乡453003

出　　处：《新乡学院学报》2018年第3期8-13,共6页Journal of Xinxiang University

基　　金：河南省高等学校重点科研项目(18A430025;18B530002);新乡学院科技创新基金项目(15ZP05)

摘　　要：采用液相超声法制备了氮掺杂碳量子点(N-CQDs)/石墨相氮化碳(g-C_3N_4)复合光催化材料。通过SEM、XRD、IR、XPS和UV-Vis对样品的形貌、结构、组成和光学性能进行表征,以可见光催化降解罗丹明B(RhB)考察其光催化活性。结果表明:N-CQDs与片状g-C_3N_4间通过杂化作用形成了复合物;与单一相的g-C_3N_4相比,N-CQDs/g-C_3N_4复合光催化剂表现出更高的光催化活性,其中0.5%-N-CQDs/g-C_3N_4样品具有最高的光催化活性,其速率常数是纯g-C_3N_4的2.5倍。光催化性能的增强原因归结于:N-CQDs高度分散在g-C_3N_4表面并形成界面间较强的杂化作用,及N-CQDs上转换性能和良好的电子传输能力与g-C_3N_4光催化性能的协同作用。The N-CQDs/g-C3N4 composite photocatalyst was successfully synthesized by using a liquid-phase ultrasonic method.The as-prepared samples were characterized by SEM,XRD,IR,XPS,UV-Vis and photogradation of RhB for morphological,comprehensive structural and visible-light properties.This results showed the N-CQDs and sheet-like g-C3N4 formed N-CQDs/g-C3N4 composites via hybridization effect.The N-CQDs/g-C3N4 photocatalysts possessed enhanced photocatalytic activity than the pure g-C3N4 under visible light,and the 0.5%-N-CQDs/g-C3N4 showed the highest photocatalytic activity,whose rate constant was as 2.5 times as that of the pure g-C3N4.The enhanced performance could be attributed to the high-dispersed N-CQDs on g-C3N4 via tight bonding and the synergistic effect of its good capability of electronic transmission and up-conversion fluorescence of N-CQDs and g-C3N4 photocatalytic properties.

关 键 词：氮掺杂碳量子点 氮化碳 修饰 杂化作用 光催化 

分 类 号：O643.36[理学—物理化学]