Synthesis And Characterization Of Novel Zn Modified Ceo2@Biochar Nanocomposite And Its Application In Fenton-Activated Photocatalytic Degradation Of Methylene Blue Dye
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Date
2022
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Department of Chemistry, NITS
Abstract
Herein, a novel nanocomposite, namely, Zn modified CeO2@biochar (Zn/CeO2@BC) is synthesized via facile one-step sol-precipitation to study its photocatalytic activity towards the removal of Methylene Blue dye. Firstly, Zn/Ce(OH)4@biochar was precipitated by the addition of sodium hydroxide to cerium salt precursor, then the composite was calcined in muffle furnace to convert Ce(OH)4 into CeO2. The crystallite structure, topographical and morphological properties, chemical compositions and specific surface area of the synthesized nanocomposite are characterized by XRD, SEM, TEM, XPS, and BET analysis. The nearly spherical Zn/CeO2@biochar nanocomposite has an average particle size of 27.05 nm and a specific surface area of 141.59 m2/g. All the tests showed the agglomeration of Zn nanoparticles over CeO2@biochar matrix. The synthesized nanocomposite showed a remarkable photocatalytic activity towards the removal of Methylene Blue, an organic dye commonly found in industrial effluents. The kinetics and mechanism of Fenton-activated dye degradation were studied. The nanocomposite exhibited a highest degradation efficiency of 98.24% under direct solar-irradiation of 90 minutes, at an optimum dosage of 0.2 g L-1 catalyst and 10 ppm dye concentration, in presence of 25% (V/V) 1 mL hydrogen peroxide. The degradation process followed a pseudo-first-order kinetics having rate constant (k) value of 0.04331 min-1.