Jiang Zhe, Le Shukun, Xie Yingjie, Huang Qiuyan, Wang Bin, Jiang Tingshun
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
J Nanosci Nanotechnol. 2019 Feb 1;19(2):721-728. doi: 10.1166/jnn.2019.15732.
To study the photocatalytic activity under visible light irradiation, a series of mesoporous graphitic carbon nitride (mpg-C₃N₄)/Ag₂O photocatalysts were synthesized. The as-prepared photocatalysts were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N₂ adsorption Brunauer-Emmett-Teller method (N₂-BET), Fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectra (DRS), and photoluminescence spectra (PL) methods to determine their phase structure, purity, morphology, spectroscopic and photoluminescence emission performance, respectively. Photocatalytic degradation of methyl orange (MO) aqueous solution under visible-light irradiation indicated that the mpg-C₃N₄/Ag₂O-50 nanocomposite exhibited the best activity. The degradation rate of MO reached to 90.8% in 120 min onto the mpg-C₃N₄/Ag₂O-50 nanocomposite, and as compared with the pure mpg-C₃N₄ and Ag₂O samples, the photocatalytic activity of the mpg-C₃N₄/Ag₂O-50 nanocomposite was greatly enhanced. The enhancement of photocatalytic activity was mainly ascribed to the enhanced visible-light absorption ability and the formation of heterojunctions between counterparts of the nanocomposites, which promoted the generation and separation of charge carriers.
为研究可见光照射下的光催化活性，合成了一系列介孔石墨相氮化碳（mpg-C₃N₄）/Ag₂O光催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、N₂吸附- Brunauer-Emmett-Teller法（N₂-BET）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（DRS）和光致发光光谱（PL）等方法对所制备的光催化剂进行表征，分别确定其相结构、纯度、形貌、光谱和光致发光发射性能。可见光照射下甲基橙（MO）水溶液的光催化降解表明，mpg-C₃N₄/Ag₂O-50纳米复合材料表现出最佳活性。在mpg-C₃N₄/Ag₂O-50纳米复合材料上，120分钟内MO的降解率达到90.8%，与纯mpg-C₃N₄和Ag₂O样品相比，mpg-C₃N₄/Ag₂O-50纳米复合材料的光催化活性大大提高。光催化活性的提高主要归因于可见光吸收能力的增强以及纳米复合材料各组分之间形成的异质结，这促进了电荷载流子的产生和分离。
