Adsorption kinetics of lead and zinc Ions by coffee residues

• Autorzy: Wu C.-H. , Kuo C.-Y. , Guan S.-S.
• Języki publikacji: EN

Abstrakty

EN

Untreated coffee residues (UCRs) were used to remove heavy metal ions from aqueous solutions. The effects of solution pH, heavy metal ions, and UCR concentrations on heavy metal ion removal by UCRs were determined. The removal percentage for heavy metal ions increased as pH and UCR doses increased; conversely, it decreased as the concentration of heavy metal ions increased. This study employed the pseudo firstand second-order kinetics models, the intraparticle diffusion model, and the Bangham model to simulate adsorption kinetics of Pb²⁺ and Zn²⁺ onto UCRs. Simulation results indicate that adsorption kinetics fit well with the pseudo second-order model. After reaction for 180 min at [adsorbate] = 20 mg/L, [UCRs] = 2 g/L, and pH 5, the adsorption percentage of Pb²⁺ and Zn²⁺ was 96% and 44%, respectively; moreover, the adsorption density of Pb²⁺ and Zn²⁺ onto UCRs was 9.7 and 4.4 mg/g (4.7×10⁻² and 6.8×10⁻² mmol/g), respectively. The adsorption of Pb²⁺ and Zn²⁺ onto UCRs is controlled mainly by surface diffusion.

• Wydawca: -
• Czasopismo: Polish Journal of Environmental Studies
• Rocznik: 2015
• Tom: 24
• Numer: 2
• Opis fizyczny: p.761-767,fig.,ref.

Twórcy

autor

Wu C.-H.

• Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung, Taiwan

autor

Kuo C.-Y.

• Department of Environmental and Safety Engineering, National Yunlin University of Science and Technology, 123 University Road, Sec. 3, Douliou, Yunlin, Taiwan

autor

Guan S.-S.

• Department of Environmental Engineering, Da-Yeh University, Da-Tsuen, Chang-Hua, Taiwan

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Identyfikatory

DOI

10.15244/pjoes/31222