School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China.
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, PR China.
Chemosphere. 2018 Nov;210:257-266. doi: 10.1016/j.chemosphere.2018.07.010. Epub 2018 Jul 3.
A set of binary composites α-FeO/BiOCl were established through an in-situ deposition route and these samples were systematically characterized by a collection of analytical techniques. Scanning electron microscopy, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy proved the coexistence of expected two components. High resolution transmission electron microscopy and selected-area electron diffraction indicated the formation of heterojunction domains with the intimate contact of both semiconductors. The degradation behavior of as-synthesized samples was evaluated under visible-light irradiation and the enhanced outcome was observed over dye methyl orange (MO) and colorless 2,4-dichlorophenol (2,4-DCP), mainly attributing to favorable optical and morphological merits, and a suitable well-aligned band structure in these binary composites with a suitable phase composition as well. In addition, these composites showed an obvious photo-Fenton feature that significantly improved the catalytic degradation efficiency over 2,4-DCP when the reagent HO was introduced, indicating the destruction efficiency was controlled by a synergtic effect from both photocatalytic and photo-Fenton degradation routes. Based upon the detection of reactive radical species, a primary synergistic mechanism was eventually speculated.
通过原位沉积法建立了一组二元复合物α-FeO/BiOCl，并通过一系列分析技术对这些样品进行了系统的表征。扫描电子显微镜、紫外-可见漫反射光谱和 X 射线光电子能谱证明了预期两种成分的共存。高分辨率透射电子显微镜和选区电子衍射表明形成了具有两种半导体紧密接触的异质结畴。在可见光照射下评价了合成样品的降解行为，在染料甲基橙 (MO) 和无色 2,4-二氯苯酚 (2,4-DCP) 的降解中观察到增强的效果，这主要归因于这些二元复合物中有利的光学和形态特性以及合适的能带结构排列和适当的相组成。此外，当引入试剂 HO 时，这些复合物表现出明显的类芬顿光催化特征，显著提高了 2,4-DCP 的催化降解效率，表明破坏效率受到光催化和类芬顿降解途径协同效应的控制。根据活性自由基物种的检测，最终推测出一种主要的协同机制。
