Widespread pollution of water bodies by textile industries, agricultural wastes and organic contaminants has developed water contamination which has become one of the chief worldwide environmental disasters. The outcome of this uncivilized negligence is modeling solemn dangers to health of living beings thus today; sustaining water reserves for the spirit of life is of severe concern. Thus, there is a prerequisite for an effectual, cost-effective, steadfast, feasible and eco-friendly technology to remove pollutants and bacterium from wastewater. Advanced oxidation processes would be one of greatest favorable preferences for wastewater mitigation. This chapter reviews the preparation and characterization of carbon nanocomposites, and photocatalytic and anti-bacterial activity of carbon nanocomposites. Furthermore, the comprehension breakdowns and research confronts have been underlined, incorporating fabrication, optimization and critical concerns linked with carbon nanocomposites for its commercialization for the bacterial disinfection and contaminant degradation.