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- Title
REMOVAL OF VANADIUM IONS FROM AQUEOUS SOLUTIONS USING DIFFERENT TYPE OF HYDROXYAPATITES: ADSORPTION ISOTHERM, KINETICS AND THERMODYNAMIC STUDIES.
- Authors
Zinicovscaia, Inga; Yushin, Nikita; Abdusamadzoda, Daler; Grozdov, Dmitrii; Humelnicu, Ionel; Ignat, Maria; Humelnicu, Doina
- Abstract
Removal of vanadium (V) by hydroxyapatite and its two modifications under different pH, contact time, vanadium concentration, and the temperature has been evaluated. The maximum removal of vanadium ions was achieved at pH 2.0. Four kinetic models (pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion model) and three isotherm models (Langmuir, Freundlich, and Temkin) were used to describe the adsorption kinetics and adsorption equilibrium data. The maximum adsorption capacity was obtained for hydroxyapatite treated with Pluronic P123 (24.1 mg/g), followed by hydroxyapatite treated with Pluronic F127 (14.20 mg/g) surfactant and untreated hydroxyapatite (18.10 mg/g). The standard free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were calculated to understand the nature of the adsorption process.
- Subjects
ADSORPTION kinetics; ADSORPTION isotherms; VANADIUM; AQUEOUS solutions; IONS; ADSORPTION capacity
- Publication
Environmental Engineering & Management Journal (EEMJ), 2021, Vol 20, Issue 6, p871
- ISSN
1582-9596
- Publication type
Article
- DOI
10.30638/eemj.2021.081