Synthesis and Performance Evaluation of Titanium Dioxide Supported Bentonite Composite for Methyl Orange Removal from Wastewater

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Addis Ababa University


Dye effluents discharged from different industries causes series damage to aquatic animals as well as human beings by mutagenic and carcinogenic effects. Thus, the effluents needs to be treated before discharged to the environment using advanced oxidation process. TiO2 supported bentonite composite was used in the photocatalytic discoloration of dyes from wastewater i.e., methyl orange (MO). During usage of the composite as a photocatalyst for dye removal, physiochemical characteristics and effect of synthesis and photocatalytic parameters were investigated using Box-Behnkon Design response surface methodology. Characterization of the composite catalyst XRD analysis revealed that, the composite catalyst contains bentonite component (montmorillonite, quartz and feldspar) and TiO2 components (anatase and rutile). The crystal size of raw bentonite and composite were 24.73nm and 53.43nm respectively. In the design of experiment, the efficient catalyst was selected based on its dye removal efficiency via numerical optimization. Calcination temperature 400 C, calcination time 2h and TiO2 to bentonite ratio 0.2 were selected for 96.54% removal efficiency. Also for photocatalytic experiment dye concentration 10mg/L, catalyst dose 1.5g/L and UV irradiation time 2h gave 94.88% removal efficiency. The study justified that, composite photocatalyst titanium dioxide supported with bentonite has many advantages such as improve photocatalytic efficiency, recycling efficiency of the catalyst, improves the recovery rate, save the cost of treatment and improves the light absorption efficiency.



Impregnation, Composite, Photocatalysis, Methyl orange, Box-Behnkon Design