Nanomaterials (NMs) due to their very small size and shape have a wide range of applications, i.e., material science, catalysis, remediation of pollutants, recovery of resources, medical, energy, agriculture, photocatalysis, etc. The study of redox processes is crucial for designing circular models to solve various environmental concerns. The main objectives behind the development of redox-based circular models are to minimize to waste, maximize the efficiency, and promote the 3R concept, i.e., reduce, reuse, and recycling to reduce the environmental impacts. The motivation behind the study of chemistry of redox nanomaterials (RNMs) or hybrid redox nanomaterials (HRNMs) originates due to its novel applications in the field of resource recovery and pollutants remediation. By understanding the redox properties of NMs, one can develop novel and economical method/technology for water purification. In this chapter, we have concluded the recent development in the fields of RNMs and their applications in the field of environmental remediation and resource recovery from wastewater.