Several well-established techniques are utilised for the manufacture of nano catalysts. The shortcomings of the most of conventional chemical and physical methods, such as toxicity of precursors, the requirement for higher precision, as well as the high cost of synthesis, impede their practical application in a variety of industries. The creation, execution, and development of chemical processes and products that minimize or remove waste and hazardous and toxic substances. Nano catalysts are distinguished by their nanoparticle size and high surface-to-volume ratio. The treatment and purifying of wastewater is an important use of nano catalysts. This article investigates nano catalysts based on noble and magnetically nano catalysts, as well as metallic catalyst accompanied by organic polymers, and their effluent treatment methods in an industrial context. This paper focuses on the biogenic production of nano catalysts.