Adsorption behavior of Cd2+ ions using hydroxyapatite (HAp) powder

• Main Authors: Thi Thom Nguyen, Thi Mai Thanh Dinh, Thi Nam Pham, Thu Phuong Nguyen, Buess-Herman Claudine
• Format: Article
• Language: English
• Published: De Gruyter 2018-10-01
• Series: Green Processing and Synthesis
• Subjects: adsorbent; adsorption; cd2+ ions; hydroxyapatite (hap)
• Online Access: https://doi.org/10.1515/gps-2018-0031

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, Cd2+ ions present in water were treated using hydroxyapatite (HAp) as adsorbent. The effects of contact time, initial Cd2+ concentration, solution pH, and adsorbent mass on the adsorption capacity and efficiency of HAp were investigated. Cd2+ 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 Cd2+ removal process follows the pseudo-second-order law.