ABSTRACT
According to the World Health Organization (WHO), water and air pollution constitutes about 23%–30% of the global burden of disease in the present-day society. This chapter discusses the synthesis of various metal oxide nanoparticles using the sol-gel methodology and their application in the removal of various types of air and water pollutants. In recent years, various metal oxide nanoparticles, attributed with unique physical and chemical properties, have emerged as a choice of technology to remove various types of pollutants from air and water. Metal oxide nanoparticles can be synthesized using a number of methods, such as coprecipitation, hydrothermal processing, solvothermal methods, and sol-gel chemistry. The sol-gel method can be of two types: aqueous sol-gel chemistry and nonaqueous sol-gel chemistry. Synthesis of cobalt-doped titania nanoparticles using the sol-gel method has been reported for the purpose of water and air purification. Hamadanian and group used titanium isopropoxide and cobalt nitrate as the metal precursors.
