氧氮共掺杂石墨烯光催化降解高浓度亚甲基蓝性能研究

Study on photocatalytic degradation of high concentration methylene blue by oxygen and nitrogen Co-doped graphene

本文采用原位合成法及混酸氧化法制备氧氮共掺杂石墨烯(ONG)。通过透射电子显微镜分析(TEM)、X射线能谱分析(XPS)、紫外可见光漫反射(UV-vis DRS)、光致发光光谱(PL)等测试方法对所制得催化剂进行了表征,并以亚甲基蓝为目标降解物探究了材料的光催化活性及降解机理。结果表明:混酸氧化法制备的氧氮共掺杂石墨烯,在350-800 nm可见光区域中有强吸收峰,光学带隙为2.5 eV,室温条件下5 mg ONG对100 mg·L^(-1)高浓度亚甲基蓝溶液光催化降解率达88%。光催化过程中产生的e-是降解亚甲基蓝最主要的活性物种。

In this paper,oxygen-nitrogen co-doped graphene(ONG)was prepared by in-situ synthesis and mixed acid oxidation.The as-prepared catalysts were characterized by transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),UV-vis diffuse reflectance spectroscopy(UV-vis DRS)and photoluminescence(PL).The photocatalytic activity and degradation mechanism of the materials were investigated by using methylene blue as the target degradation product.The results show that the oxygen and nitrogen co-doped graphene prepared by mixed acid oxidation method has strong absorption peaks in the visible light region of 350-800 nm,and the optical band gap is 2.5 eV.At room temperature,the photocatalytic degradation rate of 5 mg ONG on 100 mg·L^(-1) high concentration methylene blue solution is 88%.The e-produced in the photocatalytic process is the main active species to degrade methylene blue.