Abstract
Perovskite-type CaTiO3 material was synthesized by the polymeric precursor method and characterized. The powder was applied as a promising alternative to TiO2 photocatalyst. Photocatalytic reaction parameters were optimized by surface analysis methodology on the degradation of methylene blue under UV radiation. After optimization, complex textile- and tannery wastewaters were treated and the COD reduction was evaluated. At optimized conditions (pH=11.2 and 1 g L-1 of catalyst concentration), the results obtained for the photodegradation of the real wastewater after 240 min of irradiation were 45% COD reduction for both effluents. The reactions were adjusted to the pseudo first order kinetic and the rate constants were 2.07 x 10-3 (min-1) and 2.23 x 10- 3 (min-1) for COD reduction for textile- and tannery wastewaters, respectively.
Highlights
It is well known that industries strongly contribute to the contamination of water bodies, the textile and leather industries, since they use a large volume of water in their processes, generating large amounts of effluents
The orthorhombic phase belonging to the space group Pbnm was identified by ICDD
Perovskite-type CaTiO3, with mesoporous structure were synthesized and the photocatalytic degradation of methylene blue were optimized by means of response surface methodology
Summary
It is well known that industries strongly contribute to the contamination of water bodies, the textile and leather industries, since they use a large volume of water in their processes, generating large amounts of effluents. The wastewater from these industries present high organic loads, marked color and resistance to biodegradation, among other aggravating factors (Schimidt et al, 2013). The dyeing of animal skin products as well as mechanical and hydrothermal resistance by the tannery industries is one of the most pollutant processes in terms of the complexity of the effluent generated, which has high organic and inorganic loads, strong color, solids, and specific pollutants such as chromium (Hasegawa et al, 2014; Sauer et al, 2006). The process is based on the irradiation of a semiconductor oxide, with photons whose energy is equal to or greater than the band gap energy of the semiconductor, generating holes in the valence band as electrons are promoted to the conduction band, leading to the formation of active sites capable of promoting redox reactions
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