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- Title
Adsorption mechanism of Pb(II) and Ni(II) from aqueous solution by TiO<sub>2</sub> nanoparticles: kinetics, isotherms and thermodynamic studies.
- Authors
Khan, Shamshad; Zhang Dan; He Haiyan
- Abstract
In this work, TiO2 nanoparticles (TNPs) were used as an absorbent to remove Pb(II) and Ni(II) from aqueous solution. The effect of pH, ionic strength (IS), humic acid (HA), contact time, foreign ions and temperature on the adsorption of Pb(II) and Ni(II) onto TNPs were examined by batch technique. The results showed that the adsorption of Pb(II) and Ni(II) was dominated by outer-sphere surface complexation at pH < 6.0, whereas, inner-sphere surface complexation was the main absorption mechanism at pH > 6.0. The maximum absorption capacity of Pb(II) and Ni(II) onto TNPs calculated from a Langmuir model was 40.00 and 26.32 mg g-1, respectively at 303 K, exhibiting higher efficiency for Pb(II) absorption than Ni(II). The thermodynamic parameters (ΔH°, ΔS° and ΔG°) of Pb(II) and Ni(II) onto TNPs were calculated from the temperature dependent absorption, and their results demonstrated that absorption was endothermic and spontaneous. This analysis demonstrates that the TNPs can be utilized as an appropriate absorbent for the absorption of metal ions from solutions.
- Subjects
AQUEOUS solutions; ADSORPTION (Chemistry); DYNAMICS; ATMOSPHERIC temperature; HUMIC acid; SOLUTION (Chemistry); IONIC strength
- Publication
Desalination & Water Treatment, 2019, Vol 155, p237
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2019.23933