Photocatalytic Degradation of Binary Dyes Mixture over SrTiO3 Synthesized Using Sodium Carboxymethylcellulose Additive
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Photodegrading dye-contaminated effluents is a promising method for photo energy conversion and utilization. Herein, rhodamine B (RhB) and methylene blue (MB) were used as simulated dye effluent to evaluate the photocatalytic performance of carboxymethylcellulose (CMC-Na) modified SrTiO3 (STO). Cubic aggregated STO was successfully prepared by one-pot hydrothermal method. For the purpose of exploring behavior of dye molecules, different dye concentration ranging from 10 to 30 mg/L and certain catalyst loading were adopted. Under the UV light, group hindrance significantly enhanced the preferential adsorption and photodegradation to MB in RhB–MB binary solution at 10 mg/L. Quantized calculation for dye mixture was achieved. Photodegradation kinetics at different initial concentrations of binary MB/RhB solution followed pseudo-first-order model. Results on residual dye concentration and reaction time were connected by mathematic model, which could be used for predicting the residual amount of organic contaminants in effluent.
Keywordsstrontium titanate modification photocatalysis binary mixture dyes preferential degradation
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