Abstract
The increasing agricultural, industrial and domestic activities have led to an alarming increase of organic and inorganic pollutants in the aquatic systems. These pollutants can harm the environment and the living beings; thus the ecological and environmental momentousness of keeping the water resources contamination free has become a sensational concern for researchers. There was an immediate need to develop a methodology for complete removal of contaminants from water resources for sustainable co-existence of all creatures. Conventional water treatment processes like adsorption, coagulation, etc. have high operational costs and produce secondary pollutants. Other traditional methods have proven to be limited techniques due to fast charge recombination, less visible light usage, etc. This led to the emergence of photocatalysis as a propitious environment friendly process for water purification. The employment of semiconductor catalysts in photocatalysis has proven to be potent in degradation of variety of organic impurities to minimally hazardous substances. This paper reviews the potential of cadmium sulphide-based photocatalysts for organic dye degradation and its superiority over other heavily exploited photocatalysts. The complete mechanism of photocatalysis and the degradation of pollutant have been discussed.
