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

被引：0
|
作者：
Hassan Esmaili [1 ]
Amir Kotobi [1 ]
Saeed Sheibani [1 ]
Fereshteh Rashchi [1 ]
机构：
[1] School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran
来源：
InternationalJournalofMineralsMetallurgyandMaterials | 2018年 / 25卷 / 02期
关键词：
photocatalytic degradation; iron sulfide; nanoparticles; kinetics; methylene blue; visible light;
D O I：
暂无
中图分类号：
O643.36 [催化剂]; TB383.1 [];
学科分类号：
070205 ; 080501 ; 081705 ; 1406 ;
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.
引用
收藏
页码：244 / 252
页数：9
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