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Pollution of heavy metals in water can affect the health of humans and the environment; therefore, removal of heavy metal ions is getting the attention of scientists. To reduce the negative impact of heavy metals on human health and the environment, Cd 2+  ions present in water were treated using hydroxyapatite (HAp) as adsorbent. The effects of contact time, initial Cd 2+  concentration, solution pH, and adsorbent mass on the adsorption capacity and efficiency of HAp were investigated. Cd 2+  uptake was quantitatively evaluated using Langmuir and Freundlich adsorption isotherms. The maximum monolayer adsorption capacity was 119 mg/g. The experimental adsorption data were analyzed using three kinetic models: Lagergren’s pseudo-first-order law, McKay and Ho’s pseudo-second-order law, and the intra-particle diffusion model. The results showed that the Cd 2+  removal process follows the pseudo-second-order law.

Adsorption behavior of Cd 2+ ions using hydroxyapatite (HAp) powder