Abstract
The aim of the study was to investigate the photocatalytic efficiency of mill scale (waste iron oxide collected from local steel plants) for the degradation of textile dyes. The photodegradation on methylene blue (MB) in natural environment with co-existence of mill scale and oxalic acid/ H2O2 under UV or sunlight were studied. Some effecting factors such as mill scale content, oxalate ion, H2O2 and MB concentration were also investigated. Dye decomposition rate was found to increase with an increase in the amount of mill, reached a maximum and then decreased with increasing mill scale concentration. The decomposition rate decreased with increasing dye concentration. Faster dye degradation was observed by mill scale/H2O2 than with mill scale/oxalic acid system. Photocatalytic performance of mill scale (a solid waste) was found as an interesting alternative for the degradation of dyes (liquid waste).
Highlights
The textile dyeing industries of Bangladesh generate large amount of effluents, sewage sludge and solid waste materials everyday which are being directly discharged into the surrounding channel, agricultural fields, irrigation channels, surface water and these enter into river
advanced oxidation processes (AOPs) are based on the generation of hydroxyl radicals in water, which are highly reactive and nonselective oxidants being able to oxidize organic compounds unsaturated organic compounds such as azo dyes
In the present study we report the photocatalytic efficiency of cheap, commercially available metal oxide-mill scale under natural sunlight and UV light
Summary
The textile dyeing industries of Bangladesh generate large amount of effluents, sewage sludge and solid waste materials everyday which are being directly discharged into the surrounding channel, agricultural fields, irrigation channels, surface water and these enter into river. Various options have been being employed to treat such wastes These include chemical treatment such as chlorination and ozonation [1, 2], electrochemical treatment [3], physical treatment such as adsorption by activated carbon and membranes [4, 5], biological treatment and advanced oxidation processes (AOPs) [6]. Among AOPs, two of the most important processes to generate hydroxyl radicals are using the photo-Fenton and photo-ferioxalate (Fe2+/H2O2/UV and Fe2+/OA/UV) systems [7]. Participates in a classical Fenton reaction with Fe (II), formed by photo-reduction of Fe (III), producing OH [Eq. Semiconductor- photocatalysis evokes interest because of its potential to utilize natural sunlight, and studies on semiconductor- catalyzed environmental remediation using artificial UV light are numerous. The optimal conditions of experimental parameters for the removal of MB have been determined
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