Photocatalytic degradation of Malachite Green using ZnO and ZnOTiO2 nanoparticles from aqueous solution

Abstract

Today, despite the increasing demands for the products of chemical industries and the related<br />factories, the challenges of environmental pollution have not been improved and it is approaching a<br />very dangerous stage. In this regard, the role of dyeing industries in contaminating the environment is<br />undeniable. In this research, ZnO and ZnO-TiO2 nanoparticles were synthesized by co-precipitation and<br />sol-gel methods, respectively. The synthesized nanoparticles were characterized by XRD and FE-SEM<br />techniques and their band gap energy were determined using the UV-Vis spectrum obtained from the<br />suspension of nanoparticles. By using synthesized nanoparticles, degradation of malachite green under<br />irradiation of the UV (A) -Visible mixture light from aqueous solution were evaluated and the effect of<br />different parameters such as amount of photo catalyst, time of light irradiation and dose of H2O2has<br />been studied. The destruction amount was determined by UV-Vis spectroscopy method. Based on the<br />reported results, the maximum degradation efficiency of about 99% was obtained in the optimal values<br />of experimental conditions.