Photocatalytic degradation of methylene blue by nanostructured Fe/FeS powder under visible light

作     者：Hassan Esmaili Amir Kotobi Saeed Sheibani Fereshteh Rashchi 

作者机构：School of Metallurgy and Materials Engineering College of Engineering University of Tehran 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2018年第25卷第2期

页      面：244-252页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081705[工学-工业催化] 07[理学] 08[工学] 070205[理学-凝聚态物理] 0806[工学-冶金工程] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financial support of University of Tehran for this research financial support of Iran Nanotechnology Initiative Council 

主　　题：photocatalytic degradation iron sulfide nanoparticles kinetics methylene blue visible light 

摘      要：The photocatalytic performance of mechano-thermally synthesized Fe/FeS nanostructures formed from micron-sized starting materials was compared with that of a thermally synthesized nanostructure with nano-sized precursors in this paper. The properties of as-synthesized materials were studied by X-ray diffraction（XRD）, transmission electron microscopy（TEM）, vibrating sample magnetometry（VSM）, diffuse reflectance spectroscopy（DRS）, and ultraviolet–visible（UV-Vis） spectroscopy. The effects of irradiation time, methylene blue（MB） concentration, catalyst dosage, and p H value upon the degradation of MB were studied. Magnetic properties of the samples showed that both as-synthesized Fe/FeS photocatalysts are magnetically recoverable, eliminating the need for conventional filtration steps. Degradation of 5 ppm of the MB solution by mechano-thermally synthesized Fe/FeS with a photocatalyst dosage of 1 kg/m^3 at pH 11 can reach 96% after 12 ks irradiation under visible light. The photocatalytic efficiency is higher in alkaline solution. The kinetics of photocatalytic degradation in both samples is controlled by a first-order reaction. However, the rate-constant value in the thermally synthesized Fe/FeS photocatalyst sample is only 1.5 times greater than that of the mechano-thermally synthesized one.