Facile fabrication of acidified g-C3N4/g-C3N4 hybrids with enhanced photocatalysis performance under visible light irradiation
Facile fabrication of acidified g-C3N4/g-C3N4 hybrids with enhanced photocatalysis performance under visible light irradiation
复制标题
轻松制备酸化 g-C3N4/g-C3N4 杂化物，在可见光照射下具有增强的光催化性能
DOI：
10.1016/j.apcatb.2016.03.060
复制
发表时间：
2016-09-15
影响因子：
22.1
通讯作者：
Bao, Mutai
中科院分区：
文献类型：
--
作者：
Yang, Xiaolong;Qian, Fangfang;Bao, Mutai
首次采用超声分散辅助静电自组装技术合成了可见光驱动的高效酸化g-C3 N4（ACNS）/g-C3 N4异质结光催化剂。以甲基橙子（MO）为目标污染物，评价了该新型光催化剂的光催化氧化性能。采用X射线粉末衍射（XRD）、傅里叶变换红外光谱（FTIR）、紫外-可见漫反射光谱（DRS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）等方法对催化剂进行了表征。在可见光照射下（λ> 420 nm），该光催化剂的光催化降解MO的性能明显优于单独的ACNS和g-C3 N4。确定了该异质结构复合材料光催化活性的最佳ACNS含量。所述30重量% ACNS/g-C3 N4具有最高的光催化活性，其反应速率常数高达0.0216 min（-1），是裸g-C3 N4的4.3倍。通过光催化反应中活性物种的测定和光致发光技术研究了光催化剂的作用机理。不同清除剂的猝灭效应表明，反应体系中活性氢和中心点O-2（-）起主要作用。ACNS和g-C3 N4之间的协同效应被发现导致改善的光生载流子分离，因此复合光催化剂的光催化活性显着提高。(C)2016由Elsevier B. V.出版
A highly efficient visible-light-driven acidified g-C3N4 (ACNS)/g-C3N4 isotype heterojunction photocatalysts were synthesized by ultrasonic dispersion assisted electrostatic self-assembly strategy for the first time. The photocatalytic oxidation ability of the novel photocatalysts were evaluated using methyl orange (MO) as a target pollutant. The obtained ACNS/g-C3N4 photocatalysts were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FTIR), UV-vis diffuse reflection spectroscopy (DRS), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) methods. The photocatalysts exhibited a significantly enhanced photocatalytic performance in degrading MO under visible light illumination (lambda > 420 nm) compared with the pristine ACNS and g-C3N4 solely. The optimal ACNS content for the photocatalytic activity of the heterostructured composites was determined. The 30 wt.% ACNS/g-C3N4 exhibited the highest photo-catalytic activity, which showed a reaction rate constant as high as 0.0216 min(-1), 4.3 times higher than that of bare g-C3N4. The mechanism of the photocatalysts was investigated by determination of reactive species in the photocatalytic reactions and photoluminescence technique. The quenching effects of different scavengers displayed that the reactive h(+) and center dot O-2(-) played major role in the reaction systems. The synergic effect between the ACNS and g-C3N4 was found to lead to an improved photo-generated carrier separation and hence the photocatalytic activities of the composite photocatalysts were increased significantly. (C) 2016 Published by Elsevier B.V.