Investigation of photocatalytic malachite green degradation by iridium doped zinc oxide nanoparticles: Application of response surface methodology

摘要

Advanced oxidation process is a rapidly expanding technology for wastewater treatment. In the current case study, the design of experiments (DOE) which is based on response surface methodology (RSM), was employed for the investigation of the effective parameters of malachite green (MG) degradation from aqueous medium. Three independent factors involving concentration of dye, the amount of the chemical oxidant and amount of iridium (Ir) as a doping agent on the MG degradation were examined in detail. Based on the results obtained from RSM analyses, an optimum pathway to reach the high MG degradation rate (90%) under visible light was achieved by applying 10 ppm of MG concentration, 0.3224 mmol of chemical oxidant with 5% Ir doped ZnO. The experimental results proved to be in reasonable agreement with the derived response model with R-2 0.98. The synthesized photocatalyst was in detail characterized. The photocatalytic degradation of MG at different conditions was found to be fit with the second-order kinetic equation, as the best choice for efficiency, which describes the behavior of dyes adsorption. (C) 2018 Elsevier B.V. All rights reserved.