Influence of pH and Temperature on Structural, Optical and Catalytical Investigations of CeO2-SiO2 Nanoparticles
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CeO2-SiO2 nanoparticles were synthesized by surfactant assisted via sol-gel process at variable pH 9, 10 and 11 by keeping constant temperature of 27 ± 2 °C. However, same method was adopted for synthesis of CeO2-SiO2 nanoparticles at higher temperature 70 ± 2 °C while pH of the solution was kept constant at 9. Prepared nanoparticles were characterized using FTIR, SEM-EDX, PL spectrophotometer, UV-Vis spectrophotometer, XRD and DLS-PSA. Influence of varying pH and temperature on particle size, band gap, oxygen vacancies and catalytic activity for degradation of chlorpyrifos pesticide was studied. It was found that increase in pH increased the particle size and band gap, however decreased the catalytic activity towards chlorpyrifos pesticide. It was observed that increase in temperature at constant pH 9 showed slight effects on above mentioned properties. CeO2-SiO2 nanoparticles prepared at pH 9 and at temperature 27 ± 2 °C were found to have lowest particle size and band gap with highest catalytic activity.
KeywordsBand gap Oxygen vacancies Degradation Photocatalysis Pesticide
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The corresponding author (Muhammad Akhyar Farrukh) is thankful to the Higher Education Commission (HEC) Pakistan for providing funds for the Project No. 20-3142/NRPU/R&D/HEC/14 entitled “Synthesis of iron doped CeO2-SiO2 nanocomposites for catalytic degradation of organophosphorus pesticides in water”.
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