Effect of phosphate complexation on Cd2+ sorption by manganese dioxide (β-MnO2)
Abstract
Sorption of metal ions on oxide/hydroxide surfaces mediates the fate and transport of these ions in many natural systems. These metallic ions often exist in bulk in the aqueous phase as complexes with inorganic and organic ligands. In the present study, we investigated the sorption properties of manganese dioxide in the presence of phosphate which is thought to be one of the most important complex forming species. The surface area, point of zero charge and structural morphology of the solid manganese dioxide were determined. Cd(2+) sorption studies were carried out on manganese dioxide as a function of pH, temperature and phosphate concentration. Cd(2+) sorption increased with increasing pH, temperature and phosphate concentration. It was found that phosphate formed both outer and inner sphere complexes via metal and ligand-like adsorption. The Langmuir equation was applied to describe the data and from the constants of this equation different thermodynamic parameters such as DeltaH(0), DeltaS(0) and DeltaG(0) were evaluated.
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Zaman et al. confirmed that the sorption of Cd on a manganese dioxide was increased by the presence of phosphate.
“Zaman et al. [40] confirmed that the sorption of Cd on a manganese dioxide was increased by the presence of phosphate.”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [40]
The formation of type-A-ternary complexes was the main mechanism at lower pH, while the formation of type-B-ternary complexes was the predominant mechanism at higher pH values.
“The formation of type-A-ternary complexes was the main mechanism at lower pH, while the formation of typeB-ternary complexes was the predominant mechanism at higher pH values.”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [40]
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- Authors
- Zaman, M. I., Mustafa, S., Khan, S., & Xing, B.
- Affiliations
- University of Massachusetts Amherst (US)
- University of Peshawar (PK)
- Corresponding author
- Mustafa, Syed
- Venue
- Journal of Colloid and Interface Science
- Publisher
- Elsevier BV
- Published
- 2009-02
- Volume
- 330
- Issue
- 1
- Pages
- 9-19
- ISSN
- 0021-9797 (ISSN-L)
- OpenAlex
- W2018619704
- Cited by
- 89
- References
- 1
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 7 · 2023: 9 · 2022: 3 · 2021: 5 · 2020: 7 · 2019: 7 · 2018: 8 · 2017: 5 · 2016: 7 · 2015: 3 · 2014: 4 · 2013: 4 · 2012: 4
- FWCI
- 3.66
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Colloid and Interface Science (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Higher Education Commission, Pakistan
- Higher Education Commision, Pakistan
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Keywords
- cadmium sorption, manganese dioxide, β-MnO2, phosphate complexation, metal ion adsorption, outer-sphere complexes, inner-sphere complexes, Langmuir isotherm, adsorption thermodynamics, pH effect, temperature effects, point of zero charge
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