Abstract
The synthesis of an efficient catalytic system with a safe catalysis approach has always been the concern of researchers to eradicate the problems arising due to the discharge of colored pollutants by industries in water bodies. Herein, we synthesized a magnetically separable nanocatalyst, CSFe3O4@CeO2, by co-precipitation of CeO2 on the surface of magnetic Fe3O4 nanoparticles embedded in a chitosan hydrogel matrix. The synthesized catalyst was characterized by different analyses viz. FTIR, XRD, SEM–EDX and TEM. The CSFe3O4@CeO2 exhibited enhanced catalytic activity due to the unique synergism of adsorption and catalytic reduction for the removal of pollutants, namely methylene blue (MB), congo red (CR), and potassium ferricyanide using NaBH4 as a reducing agent. Further investigations of catalytic efficiency of CSFe3O4@CeO2 were done with MB by varying the catalyst dose, concentrations of MB and NaBH4. The reduction mechanism of MB to LMB (Leucomethylene blue) was studied and explained through adsorption reduction synergism. The reduction rate of MB in all catalytic experiments was determined by pseudo first-order kinetics. The adsorption isotherm data was best fit to Langmuir isotherm model indicated monolayer adsorption of MB on catalyst surface. The reusability of the catalyst with change in catalytic efficiency were also calculated to determine its economic feasibility.
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The authors thank the Department of Applied Chemistry, Aligarh Muslim University for providing research facilities. AA and KUK thanks UGC for Non-Net fellowship. UG is thankful to the CSIR-SRF (Grant No: 09/112(0633)/2019-EMR-I) for providing financial assistance.
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Ali, A., Garg, U., Khan, K.U. et al. Removal of Organic and Inorganic Pollutants Using CSFe3O4@CeO2 Nanocatalyst via Adsorption–Reduction Catalysis: A Focused Analysis on Methylene Blue. J Polym Environ 30, 4435–4451 (2022). https://doi.org/10.1007/s10924-022-02522-1
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DOI: https://doi.org/10.1007/s10924-022-02522-1