Abstract
Magnesium doped titanium dioxide (Mg+2-TiO2) with varying magnesium weight percentages (0.25 - 1.0 wt.%) has been synthesized by sol-gel method and is characterized by XRD, UV-Visible, XPS, SEM and FT-IR methods. XRD data has shown anatase crystalline phase in Mg+2-TiO2 catalysts indicating that Mg+2 did not influence the crystal patterns of TiO2. Absorption shift due to the presence of Mg+2 ions in the TiO2 structure is significant. SEM image revealed that doped catalyst has smaller particle size and higher surface area than undoped TiO2. FT-IR spectral study along with XPS established the substitution of Mg+2 into TiO2 lattice. The photocatalytic efficiency of the synthesized catalysts was investigated by performing photocatalytic degradation of methyl orange dye (MO) under visible light irradiation and it has been found that the Mg+2-TiO2 catalysts possess better catalytic activity than undoped TiO2. The effect of dopant concentration, pH, catalyst, dosage and pollutant concentrations was studied for obtaining optimal degradation conditions.
Highlights
Problems related to waste water remediation have emerged as a high national and international priority
Waste waters generated by the textile industry are rated as the most polluting among all industrial sectors, considering both the volume rejected and the composition of the effluents [1]
A photoreactor system is used to accomplish the photocatalytic degradation of methyl orange dye in the presence of visible light, using the doped and undoped TiO2 photocatalysts
Summary
Problems related to waste water remediation have emerged as a high national and international priority. Waste waters generated by the textile industry are rated as the most polluting among all industrial sectors, considering both the volume rejected and the composition of the effluents [1] It contain large amount of azo-dyes which are used in the industry of paper making, pharmacy, textile, cosmetics and food processing. TiO2, ZnO, Fe2O3, CdS and ZnS are various semiconducting photocatalysts, among which TiO2 is one of the most suitable semiconducting materials in different media [8,9] As it is proficient of decomposing a wide range of organic and inorganic pollutants and toxic materials [8,10]. Evaluation of photocatalytic activity of synthesized catalysts have been carried out by degradation of a representative azo-dye pollutant, methyl orange dye (MO), and its influence on the photocatalytic degradation of pollutants with environmental concern
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