Optimised Photocatalytic Degradation of Crystal Violet Over 1wt% MgO-ZnO Composite Catalyst

  • Umar Gaya Department of Pure and Industrial Chemistry, Bayero University, Kano, NIGERIA http://orcid.org/0000-0002-2396-3761
  • Sa’adatu Abdul-Aziz Umar Department of Pure and Industrial Chemistry, Bayero University, Kano, NIGERIA
Keywords: Photocatalysis, crystal violet, mineralization, ZnO, Box-Behnken

Abstract

Crystal violet is a member of toxic, environmentally ubiquitous basic dyes that must be eliminated. In this paper, the performance of 1wt % MgO-ZnO suspensions in the photocatalytic degradation of this dye is reported. The catalyst was characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The degradation and mineralization of crystal violet were monitored UV-Visible spectrophotometer and total organic carbon analyzer. The XRD analysis of the catalyst revealed a hexagonal wurtzite structure. The effect of operating variables such as initial crystal violet concentration, catalyst concentration and pH of the solution was optimized using the Box-Behnken design and response surface methodology. The degradation model was statistically remarkable with p<0.0001%. The maximum degradation efficiency of prepared catalyst was found to be 95 %. The degradation kinetics agreed with the Langmuir-Hinshelwood model. However, only 60% of total crystal violet-based organic carbon was removed from the solution due to recalcitrance of this environmentally important compound.

Published
2019-06-17
How to Cite
Gaya, U., & Abdul-Aziz Umar, S. (2019). Optimised Photocatalytic Degradation of Crystal Violet Over 1wt% MgO-ZnO Composite Catalyst. Journal of Science and Technology, 11(1), 25-33. Retrieved from https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/4297
Section
Articles