g-C3N4/rGO杂化催化剂的简易合成及其对罗丹明B的光催化降解作用

doi:10.1016/S1872-2067(15)60844-0

催化学报 ›› 2015, Vol. 36 ›› Issue (7): 1009-1016.DOI: 10.1016/S1872-2067(15)60844-0

g-C₃N₄/rGO杂化催化剂的简易合成及其对罗丹明B的光催化降解作用

原博^a, 魏江霞^b, 胡天娇^a, 姚海波^a, 蒋振华^a, 方志薇^b, 楚增勇^a

a 国防科学技术大学理学院, 湖南长沙410073;
b 长沙学院生物工程与环境科学系, 湖南长沙410003

收稿日期:2015-01-25 修回日期:2015-03-20 出版日期:2015-06-12 发布日期:2015-07-30
通讯作者: 楚增勇电话: (0731)84574786-811; 传真: (0731)84574250; 电子信箱: chuzy@nudt.edu.cn
基金资助:
国家自然科学基金(51073172); 湖南省自然科学杰出青年基金(14JJ1001).

Simple synthesis of g-C₃N₄/rGO hybrid catalyst for the photocatalytic degradation of rhodamine B

Bo Yuan^a, Jiangxia Wei^b, Tianjiao Hu^a, Haibo Yao^a, Zhenhua Jiang^a, Zhiwei Fang^b, Zengyong Chu^a

a College of Science, National University of Defense Technology, Changsha 410073, Hunan, China;
b Department of Biological Engineering and Environmental Science, Changsha University, Changsha 410003, Hunan, China

Received:2015-01-25 Revised:2015-03-20 Online:2015-06-12 Published:2015-07-30
Supported by:
This work was supported by the National Natural Science Foundation of China (51073172) and the Hunan Provincial Natural Science Foundation for Distinguished Young Scholars (14JJ1001).

摘要/Abstract

摘要：

在空气中直接加热三聚氰胺和氧化石墨烯(GO)的混合物制备了g-C₃N₄/rGO杂化催化剂. 实验结果表明, 混合物中的g-C₃N₄保留了石墨型氮化碳原始的特征结构, g-C₃N₄和还原的氧化石墨烯(rGO)之间的异质结主要通过π-π作用构筑. 当原料中三聚氰胺/GO的质量比是800/1时, 所得催化剂对罗丹明B的催化作用最强, 其一阶动力学常数是纯g-C₃N₄的2.6倍. 这种强化作用主要是由于rGO促进了光生电子-空穴对的分离. 此外, g-C₃N₄/rGO还表现出显著的pH值敏感特性, 催化降解速率随pH的降低而增加. 当pH = 1.98时, 其一阶动力学常数是纯g-C₃N₄的8.6倍. 这是由于酸性条件下质子(H⁺)消耗掉光生电子, 促进了空穴对罗丹明B的氧化作用, 其中rGO充当了一个快速的光生电子转移平台.

关键词: 氮化碳, 氧化石墨烯, 光催化, pH敏感性, 罗丹明B降解

Abstract:

A hybrid catalyst of g-C₃N₄ (graphitic carbon nitride)/rGO (reduced graphene oxide) was prepared by directly heating a mixture of melamine and GO in air. g-C₃N₄ in the hybrid retained the structure of pristine g-C₃N₄, and the heterojunction between g-C₃N₄ and rGO was formed by π-π interaction. The highest photocatalytic efficiency for the degradation of rhodamine B (RhB) was with the melamine/GO mass ratio of 800/1, with a first order rate constant 2.6 times that of pristine g-C₃N₄. The enhanced photocatalytic activity was assigned to the rGO-promoted separation of photo-generated electron (e^-)-hole (h⁺) pairs. In addition, the photocatalytic activity of g-C₃N₄/rGO was pH sensitive with a much increased photodegrading rate at low pH values. The first order rate constant was 8.6 times that of pristine g-C₃N₄ at pH = 1.98. The pH sensitive behavior resulted from the promoted oxidation of h⁺ with RhB by the consumption of e^- with the reaction of proton (H⁺) in which rGO acted as a good platform for transferring e^- through its atomic sheets.

Key words: Graphitic carbon nitride, Graphene oxide, Photocatalysis, pH-sensitivity, Rhodamine B degradation

原博, 魏江霞, 胡天娇, 姚海波, 蒋振华, 方志薇, 楚增勇. g-C₃N₄/rGO杂化催化剂的简易合成及其对罗丹明B的光催化降解作用[J]. 催化学报, 2015, 36(7): 1009-1016.

Bo Yuan, Jiangxia Wei, Tianjiao Hu, Haibo Yao, Zhenhua Jiang, Zhiwei Fang, Zengyong Chu . Simple synthesis of g-C₃N₄/rGO hybrid catalyst for the photocatalytic degradation of rhodamine B[J]. Chinese Journal of Catalysis, 2015, 36(7): 1009-1016.

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g-C₃N₄/rGO杂化催化剂的简易合成及其对罗丹明B的光催化降解作用

Simple synthesis of g-C₃N₄/rGO hybrid catalyst for the photocatalytic degradation of rhodamine B

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