Abstract: China has an extremely large production and stockpiling volume of phosphogypsum ( PG),which seriously damages the ecological environment and poses potential threats to human health. In order to achieve the comprehensive governance model of " treating waste with waste" ,the chemical conversion of waste phosphogypsum into hydroxyapatite (PGHAP) and its application in the environmental field represent a novel resource utilization approach,holding significant importance in fields such as phosphorus chemistry,environmental materials,and water treatment. Through literature analysis,this paper summarizes the synthesis methods and mechanisms of PGHAP,introduces its unique physicochemical properties and environmental functions,and reviews the application research of PGHAP and its composite materials in the environmental field in recent years. The results showed that PGHAP can serve as a low-cost and high-performance environmental functional material,demonstrating excellent adsorption performance for ionic pollutants such as heavy metal ions and fluoride ions. Its main adsorption mechanisms include electrostatic interaction,surface complexation,dissolution-precipitation,and ion exchange between heavy metals and the crystal lattice. PGHAP also shows potential and prospects in removing phenols,dyes,antibiotics,etc. ,from water. Elemental doping modification and composite material development are the trends and directions for PGHAP materials. However,existing research reports are relatively scarce,and further expansion and exploration in research and application are required in the future. 

Key words: phosphogypsum,hydroxyapatite,chemical transformation,water treatment,environmental field