Photocatalytic degradation of dichlorvos in visible light by Mg 2+-TiO2 Nanocatalyst

Siva Rao, T and Segne, T A and Susmitha, T and Balaram Kiran, A and Ch, Subrahmanyam (2012) Photocatalytic degradation of dichlorvos in visible light by Mg 2+-TiO2 Nanocatalyst. Advances in Materials Science and Engineering (168780). pp. 1-10. ISSN 1687-8434

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Abstract

Photocatalytic activity of TiO2 was studied by doping with magnesium (Mg2+-TiO2) with varying magnesium weight percentages ranging from 0.75-1.5wt. The doped and undoped samples were synthesized by sol-gel method and characterized by X-ray diffraction (XRD), N2 adsorption-desorption (BET), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (DRS), and scanning electron microscopy (SEM). The XRD data has shown that anatase crystalline phase in Mg2+- TiO2 catalysts, indicating that Mg2+ ions did not influence the crystal patterns of TiO2. The presence of magnesium ions in TiO2 matrix has been determined by XPS spectra. DRS spectra showed that there is a significant absorption shift towards the visible region for doped TiO2. The SEM images and BET results showed that doped catalyst has smaller particle size and highest surface area than undoped TiO2. The photocatalytic efficiency of the synthesized catalysts was investigated by the photocatalytic degradation of aqueous dichlorvos (DDVP) under visible light irradiation, and it was found that the Mg2+-doped catalysts have better catalytic activity than undoped TiO2. This can be attributed that there is a more efficient electron-hole creation in Mg2+-TiO2 in visible light, contrary to undoped TiO2 which can be excited only in UV irradiation. The effect of dopant concentration, pH of solution, dosage of catalysts, and initial pesticide concentration has been studied.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Subjects: ?? sub5.8 ??
Divisions: Department of Chemistry
Depositing User: Mr. Siva Shankar K
Date Deposited: 28 Oct 2014 08:32
Last Modified: 09 Mar 2015 06:30
URI: http://raiith.iith.ac.in/id/eprint/427
Publisher URL: http://dx.doi.org/10.1155/2012/168780
OA policy: http://www.sherpa.ac.uk/romeo/issn/1687-8434/
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