Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Kinetic Study on the Effect of PH in the Photocatalytic Degradation of Methylene Blue With Fe-FeS Nanocomposite Powder

Authors
Hasan Esmaili 1
Saeed Sheibani 2
Fereshteh Rashchi 1
1 University of Tehran, School of Metallurgy and Materials Engineering, Tehran, Iran.
2 School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran
10.30501/jamt.2017.70367
Abstract
 In this paper, photocatalytic activity of mechanothermally synthesized Fe-39%FeS nanostructured
composite powder is investigated. Fe and S powders mixture with atomic ratio of 2:1 (Fe:S) is mechanically activated
and then heat treated at 850◦C for 2 h. X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy
(FESEM) and UV-vis spectroscopy are applied for characterization of composite powder. XRD results are shown that
Fe-FeS powder was synthesized successfully. FESEM images showed that powder with the size of less than 2 μm is
formed after heat treatment. Also, the effect of pH as an effective factor is investigated. It can be seen that the
degradation efficiency in basic solution is higher than acidic and neutral solution. Dyes degradation reached to 91%
after 195 min irradiation of visible light in pH=11. In addition, kinetic study showed that the photocatalytic dedradation
is initially (0-75 min) followed by first order model and after that the mechanism is possibly changed to the second
order model. 
Keywords
photocatalyst
Composite
Nanostructure
Fe-FeS
Kinetics
pH
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  • Receive Date 30 April 2017
  • Revise Date 30 July 2017
  • Accept Date 18 October 2017