Kinetics and Equilibrium Adsorption Studies of Cd Adsorption by the Activated Carbon Containing Hydroxyapatite
- Kinetics and Equilibrium Adsorption Studies of Cd Adsorption by the Activated Carbon Containing Hydroxyapatite
- 안상우; 최재영; 박재우
- Activated carbon; Adsoption; Cadimium; Hydroxyapatite; Kinetic and equilibrium studies; 활성탄; 흡착; 카드뮴; 수산화 인회석; 동역학적 흡착과 흡착평형연구
- Issue Date
- 한국지반환경공학회 논문집
- VOL 11, NO 1, 45-51
- Cadmium (Cd) adsorption by the activated carbon containing hydroxyapatite (HAP) was investigated. Cd adsorption with
different HAP mass ranged from 10% to 30%. With more HAP, more Cd was adsorbed. These results suggest that the higher HAP
dose causes an increase of the ion exchange potential in HAP sorbent. Kinetics and equilibrium studies were investigated in series
of batch adsorption experiments. Langmuir and Freundlich isotherm models were fit to the equilibrium data and Cd adsorption on
HAP sorbent were found to follow the Freundlich isotherm model well in the initial adsorbate concentration range. The simple kinetic
model, the pseudo first order kinetic model and the pseudo second order kinetic model, were used to investigate the adsorption. The
adsorption reaction of Cd followed the pseudo second order kinetic model, and the adsorption pseudo second order kinetic constants
(k2) increased with increasing initial HAP amounts onto activated carbon. Also, intraparticle diffusion model was used to investigate
the adsorption mechanism between adsorbate and adsorbent in the aqueous phase. Surface adsorption reaction and intraparticle
diffusion occur simultaneously Cd adsorption mechanism from aqueous phase in this study.
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