Photocatalytic degradation of reactive blue 21 dye in aqueous solution by using CoSnO3 nanoparticles

With an increase of the industrialization, environmental pollution problem are getting worse. Many contaminants are often discharged from industrial and wastewater treatment plants and contaminate groundwater and surface water. Therefore, it is urgent for the scientist to find solutions to mitigate the damage that is caused by these pollutants. Several studies using catalysts have been employed to decompose harmful organic and inorganic pollutant into harmless chemicals. The remarkable progress of photocatalytic has been limited to ultraviolet light although visible light range is far more useful in the solar spectrum. Hence, the development of catalyst that can be activated in the visible region has become important topic research today [1,2]. Perovskite-type materials with the general formula of ABO3 have attracted considerable attention in the field of catalysis. It is reported that perovskite oxide exhibits high photocatalytic activity towards degradation of organic contaminant under visible light irradiation and stable in various environment. Therefore, perovskite oxide with appropriate crystal structure, morphology and optical properties for improvement of photocatalytic efficiency is paid much attention by researchers [3-5]. CoSnO3 nanoparticles were prepared using co-precipitation method with tin (II) chloride dehydrate (SnCl2.2H2O) and cobalt (II) chloride hexahydrate (CoCl2.6H2O) as raw material. The synthesized nanoparticles were characterized by means of X-ray diffraction (XRD), Infrared absorption spectroscopy (IR) and scanning electron microscopic analysis (SEM). Reactive blue 21 was used as dye model. Photocatalytic dye degradation by CoSnO3 NPs was studied by UV–Vis spectrophotometer. The photocatalytic ability of the CoSnO3 nanoparticles was demonstrated by the degradation of reactive blue 21 dye under visible light irradiation. The effects of operational parameters on decolorization such as catalyst dosage, dye concentration, and contact time were studied. The experimental results indicated that the photocatalytic property of the CoSnO3 nanoparticles was excellent. Thus, these nanoparticles could play a vital role in the environmental catalytic remediation of polluted water.