This book presents a summary of my research entitled "Synthesis of polymers containing 1,2,3-triazole from Poly(Vinyl Chloride), valorization and application in the extraction of some metals and treatment of wastewater. The method used in this synthesis is the concept of click chemistry. This work was presented in two chapters : Chapter-1 : Synthesis of polymers with one unit of (1,2,3)-triazole from PVC and its application in the extraction of metals present in aqueous solutions. Chapter-2: Synthetic of new polymers containing several units of (1,2,3)-triazoles from poly(vinyl chloride) via click chemistry catalyzed by cooper iodide and its application in the extraction of nitrate and metals located in wastewater.