Application of Hydroxyapatite for the Adsorption of Heavy Metals in Water Treatment

In recent years, the increasingly severe environmental problems, especially those related to aquatic organisms and chemical pollution, have become a significant threat to the ecosystem and human health. Many new composite materials are used to control pollution because of their environmentally friendly properties. Hydroxyapatite is a kind of phosphate biomaterial. Compared with the original ore, it has improved the adsorption of heavy metals. Because of its eco-friendliness, good dispersibility, outstanding stability, and rich surface functional groups, it has a good prospect in treating water, air, and soil pollution. It is expected to inhibit toxic pollutants for a long time. Against this background, this paper introduces the adsorption of dyes and heavy metals by hydroxyapatite and its composites, and the influence of technological factors. For instance: contact solute concentration, time, temperature, pH of the solution, etc. on adsorption.