Bhar Sumana, Ananthakrishnan Rajakumar
Department of Chemistry, Green Environmental Materials & Analytical Chemistry Laboratory, Indian Institute of Technology, Kharagpur 721302, India.
Photochem Photobiol Sci. 2017 Aug 9;16(8):1290-1300. doi: 10.1039/c6pp00363j.
The work focuses on room-temperature photocatalytic degradation of phenolic compounds by Ru(ii)-complex immobilized mesoporous silica SBA-15 under visible light in an aqueous medium. The immobilization of [Ru(bpy)]Cl complex on an SBA-15 surface is carried out, and the as-synthesized hybrid is characterized by X-ray Diffraction (XRD), Fourier Transformation IR Spectroscopy (FTIR), Diffuse Reflectance Spectroscopy (DRS), Brunauer-Emmett-Teller analysis (BET), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray analysis (EDX) and X-ray Photoelectron Spectroscopy (XPS). Kinetic studies of photodegradation reactions are followed by High Performance Liquid Chromatography (HPLC). Control studies are performed to elucidate the nature of the photodegradation process. The maximum degradation of DCP reached 95% for 10 ppm concentration of the contaminants with an optimum amount of catalyst being 1 g L in 150 min of light irradiation. The long-lived intermediates are identified by HPLC, and the final products are identified by GC-MS. From a series of experiments, the mechanistic steps of the photodegradation process are identified.
该工作聚焦于在水介质中，通过固定有钌（II）配合物的介孔二氧化硅SBA - 15在可见光下对酚类化合物进行室温光催化降解。将[Ru(bpy)]Cl配合物固定在SBA - 15表面，通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、漫反射光谱（DRS）、布鲁诺尔 - 埃米特 - 泰勒分析（BET）、扫描电子显微镜（SEM）、能量色散X射线分析（EDX）和X射线光电子能谱（XPS）对合成的杂化物进行表征。通过高效液相色谱（HPLC）对光降解反应进行动力学研究。进行对照研究以阐明光降解过程的本质。对于10 ppm浓度的污染物，在150分钟光照下，最佳催化剂用量为1 g/L时，DCP的最大降解率达到95%。通过HPLC鉴定长寿命中间体，通过GC - MS鉴定最终产物。通过一系列实验，确定了光降解过程的机理步骤。
