Enhanced performance of g-C_3N_4/TiO_2 photocatalysts for degradation of organic pollutants under visible light  

可见光催化降解有机污染物g-C_3N_4/TiO_2光催化剂的性能增强（英文）

作　　者：宋改雪 储震宇 金万勤 孙红旗 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University [2]Department of Chemical Engineering,Curtin University

出　　处：《Chinese Journal of Chemical Engineering》2015年第8期1326-1334,共9页中国化学工程学报（英文版）

基　　金：Supported by the Innovative Research Team Program by the Ministry of Education of China(IRT13070);the Nature Science Foundation of Jiangsu Province(BK2012423,BK20130925);the Opening Project of State Key Laboratory of Materials-Oriented Chemical Engineering of China(KL13-02)

摘　　要：Photocatalytic degradation is one of the most promising remediation technologies in terms of advanced oxidation processes(AOPs) for water treatment. In this study, novel graphitic carbon nitride/titanium dioxide(gC3N4/Ti O2) composites were synthesized by a facile sonication method. The physicochemical properties of the photocatalyst with different mass ratios of g-C3N4 to Ti O2 were investigated by X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscopy(TEM), N2 sorption, Fourier transform infrared spectroscopy(FT-IR), X-ray photoelectron spectroscopy(XPS), and UV–vis DRS. The photocatalytic performances were evaluated by degradation of methylene blue. It was found that g-C3N4/Ti O2 with a mass ratio of 1.5:1 exhibited the best degradation performance. Under UV, the degradation rate of g-C3N4/Ti O2 was 6.92 and 2.65 times higher than g-C3N4 and Ti O2, respectively. While under visible light, the enhancement factors became 9.27(to g-C3N4) and 7.03(to Ti O2). The improved photocatalytic activity was ascribed to the interfacial charge transfer between g-C3N4 and Ti O2. This work suggests that hybridization can produce promising solar materials for environmental remediation.Photocatalytic degradation is one of the most promising remediation technologies in terms of advanced oxidation processes（AOPs） for water treatment. In this study, novel graphitic carbon nitride/titanium dioxide（gC3N4/Ti O2） composites were synthesized by a facile sonication method. The physicochemical properties of the photocatalyst with different mass ratios of g-C3N4 to Ti O2 were investigated by X-ray diffraction（XRD）, scanning electron microscope（SEM）, transmission electron microscopy（TEM）, N2 sorption, Fourier transform infrared spectroscopy（FT-IR）, X-ray photoelectron spectroscopy（XPS）, and UV–vis DRS. The photocatalytic performances were evaluated by degradation of methylene blue. It was found that g-C3N4/Ti O2 with a mass ratio of 1.5：1 exhibited the best degradation performance. Under UV, the degradation rate of g-C3N4/Ti O2 was 6.92 and 2.65 times higher than g-C3N4 and Ti O2, respectively. While under visible light, the enhancement factors became 9.27（to g-C3N4） and 7.03（to Ti O2）. The improved photocatalytic activity was ascribed to the interfacial charge transfer between g-C3N4 and Ti O2. This work suggests that hybridization can produce promising solar materials for environmental remediation.

关 键 词：Carbon nitride Titanium dioxide Composite Photodegradation Sonication 

分 类 号：X505[环境科学与工程—环境工程] O643.36[理学—物理化学]