Synthesis of hydroxyapatite from mussel shells for effective adsorption of aqueous Cd(II) | Zendy

S. Meski | Zendy; Nedjma Tazibt | Zendy; Hafit Khireddine | Zendy; Salima Ziani | Zendy; W. Biba | Zendy; Sabeha Yala | Zendy; Djahida Sidane | Zendy; Farés Boudjouan | Zendy; NAIMA MOUSSAOUI | Zendy

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Synthesis of hydroxyapatite from mussel shells for effective adsorption of aqueous Cd(II)

Author(s) -

S. Meski,

Nedjma Tazibt,

Hafit Khireddine,

Salima Ziani,

W. Biba,

Sabeha Yala,

Djahida Sidane,

Farés Boudjouan,

NAIMA MOUSSAOUI

Publication year - 2019

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2019.366

Subject(s) - adsorption , endothermic process , aqueous solution , phosphoric acid , langmuir adsorption model , chemistry , cadmium , dissolution , nuclear chemistry , precipitation , ion exchange , inorganic chemistry , ion , organic chemistry , physics , meteorology

We report the synthesis of hydroxyapatite (HAP) powder from waste mussel shells (decomposed to CaO) and phosphoric acid at room temperature without pH control. The powder synthesized was utilized for cadmium removal from aqueous solutions using the batch technique. The effects of solution pH, adsorbent dose; initial Cd2+ concentration, contact time, and temperatures were examined. Furthermore, the adsorption process revealed a pseudo-second-order reaction model and the Langmuir isotherm is the best-fit model to predict the experimental data and adsorption capacity was found to be 62.5 mg/g. Thermodynamic analysis revealed that because of the negative values of ΔGo and the positive value of ΔHo, the adsorption process was spontaneous and endothermic. Cadmium immobilization occurs through a two step mechanism: rapid ion exchange followed by partial dissolution of hydroxapatite and precipitation of cadmium containing hydroxyapatite.

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