Sol-gel synthesis of ZnO nanoparticles for optmized photocatalytic degradation of Eriochrome Black T under UV irradiation

Auwal Yusha’u; Muhammad Sulaiman Darma; Kamaluddeen Abubakar Isah

doi:10.57056/ajet.v8i1.100

Authors

Auwal Yusha’u Department of Applied Chemistry, Faculty of Physical Science, Federal University Dutsin-Ma, P. M. B. 5001, Katsina State, Nigeria.
Muhammad Sulaiman Darma Department of Applied Chemistry, Faculty of Physical Science, Federal University Dutsin-Ma, P. M. B. 5001, Katsina State, Nigeria.
Kamaluddeen Abubakar Isah Department of Chemistry, Bauchi State University, Gadau, P. M. B. 65 Gadau, Nigeria.

DOI:

https://doi.org/10.57056/ajet.v8i1.100

Keywords:

Photocatalysis, ZnO, Box-benhken, UV-light, Eriochrome Black T

Abstract

In this work, zinc oxide (ZnO) nanoparticles was synthesized by sol-gel method and characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), energy dispersive spectroscopy (EDS) and ultraviolet-visible (UV-Vis) spectrophotometry. The XRD analysis of the as synthesized catalyst revealed a hexagonal wurtzite structure. The average particle size and band gap values were 24.67nm and 3.28eV respectively. The peak observed at 452cm^-1 corresponds to Zn-O stretching vibrational band. The effect of operating paramers such as initial concentration of eriochrome black-T (EBT), concentration of catalyst and pH of the solution was optimized using box-benhken design (BBD) and response surface methodology (RSM). The optimum photodegradation efficiency of 96.59% was obtained at 15.00mg of EBT concentration, 0.40g catalyst concentration and initial pH of 9.00. The degradation model was statistically remarkable with p < 0.0001% in which the EBT initial concentration and catalyst concentration were the most significant variables influencing the degradation of EBT over ZnO photocatalyst under UV irradiation.

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