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Surface interaction of cadmium and zinc metal ions on Al2O3 nanoparticles in aqueous solution.
- Source :
- International Journal of Environmental Analytical Chemistry; Dec2022, Vol. 102 Issue 17, p5321-5338, 18p
- Publication Year :
- 2022
-
Abstract
- The adsorbent ability of Al<subscript>2</subscript>O<subscript>3</subscript> nanoparticles (ANPs) was examined to remove Cd<superscript>2+</superscript> and Zn<superscript>2+</superscript> from aqueous solution. The sorption of Cd<superscript>2+</superscript> and Zn<superscript>2+</superscript> on ANPs as a function of pH, ionic strength (IS), humic acid (HA), contact time, foreign ions and the temperature were investigated. It was observed that physico-chemical factors (pH and ionic strength) strongly affect the sorption of Cd<superscript>2+</superscript> and Zn<superscript>2+</superscript> on ANPs. Comparatively, the sorption of Cd<superscript>2+</superscript> and Zn<superscript>2+</superscript> dominated by surface complexation of the outer sphere at low pH values (pH < 8.0), while surface complexation of the inner sphere was the major sorption mechanism at elevated pH values (pH > 8.0). The maximum sorption capacity of Cd<superscript>2+</superscript> and Zn<superscript>2+</superscript> on ANPs calculated from the Langmuir model was 8.40 and 9.00 mg g<superscript>–1</superscript> respectively at 303 K, exhibiting higher efficiency for Zn<superscript>2+</superscript> sorption than Cd<superscript>2+</superscript>.The thermodynamic parameters (∆H<superscript>0</superscript>, ∆S<superscript>0</superscript> and ∆G<superscript>0</superscript>) showed that the adsorption of Cd<superscript>2+</superscript> and Zn<superscript>2+</superscript> was endothermic and spontaneous. This investigation exhibited that ANP is an efficient, inexpensive process and thereby reasonable technology for the elimination of metal ions from the contaminated aqueous source. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03067319
- Volume :
- 102
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- International Journal of Environmental Analytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 160786258
- Full Text :
- https://doi.org/10.1080/03067319.2020.1796990