Degradation of Commercial Dyes Using Mill Scale by photo-Fenton

Abstract

Photocatalytic degradation of two commercial dyes, Methylene Blue and Reactive Orange 4, in aqueous phase by mill scale (solid waste generated in steel plants) using advanced oxidation process was studied. The effects of various factors on the extent of degradation were investigated. These included: (1) the catalyst quantity, in the range 0.1-1.3 g/100 mL; (2) Methylene Blue concentration in the range 0.01-0.1 mM/100 mL; (3) Reactive Orange 4 concentration in the range 0.05-0.25 mM/100 mL; and (4) the concentration of hydrogen peroxide in the range 1-4/100 mL for Methylene Blue and 1-2/100 mL for Reactive Orange 4. The optimum catalyst dose in presence of hydrogen peroxide and UV illumination was found to be 0.8 and 0.3 g/100 mL for Methylene Blue and Reactive Orange 4, respectively. The decomposition rate was found to decrease with increasing dye concentration and increase with increasing hydrogen peroxide concentration.

Valorization of the Spent Biomass of Pleurotus mutilus Immobilized as Calcium Alginate Biobeads for Methylene Blue Biosorption

“…These include oxido-reduction (Forootanfar et al 2012), photocatalytic degradation (Islam et al 2015) and adsorption (Bhatti et al 2011;Daou et al 2015). The latter may involve high capital and operational costs and generate secondary waste presenting treatment problems (Rafatullah et al 2010).…”