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- Title
Polyaspartic acid-grafted montmorillonite composite: a new adsorbent for the removal of copper(II), zinc(II), nickel(II).
- Authors
Dongshen Tong; Min Wan; Youmiao Zheng; Yanrui Han; Jun Hu
- Abstract
Environment-friendly water treatment has received considerable attention in recent decades. Polyaspartic acid (PASP) is the biodegradable green materials with carboxyl groups (–COOH) and amido groups (–CO–NH–). A new adsorbent, PASP-grafted montmorillonite (Mt) nanocomposite, was prepared and used to remove Cu(II), Zn(II), and Ni(II) ions from aqueous solutions. The synthesized materials were characterized by X-ray diffraction, Fourier transform-infrared spectroscopy, and thermal analysis. The effects of absorbent amount, pH, initial concentration, and temperature were investigated. The first-order Lagergren model and second-order Lagergren models were used to describe the kinetic data, and the Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin adsorption models were applied to describe the equilibrium isotherms. The results showed the adsorption of Cu(II) onto PASP/Mt is more suitable for Freundlich model, while Zn(II) and Ni(II) ions adsorption belongs to Temkin and Langmuir models, respectively. Second-order model represents the experimental kinetic data in a better manner than first order. In addition, the activation energy, change of Gibbs free energy, enthalpy, and entropy of adsorption were also evaluated for the adsorption. The competitive experiments were also studied to determine adsorptive selectivity of Cu(II), Zn(II), and Ni(II) ions and the selectivity of PASP/Mt for the metals was arranged in follows: Cu(II) > Zn(II) > Ni(II).
- Subjects
MONTMORILLONITE; SORBENTS; SEWAGE purification
- Publication
Desalination & Water Treatment, 2018, Vol 133, p103
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2018.22849