Effect of Surface Functionalization on the Adsorption of Arsenic Using Magnetite Nanocrystals
Bare-magnetite nanocrystals with an average size of 10 nm, synthesized using the co-precipitation method, were functionalized with sodium oleate (SO) in aqueous media. The SO–magnetite nanocrystals were then functionalized with meso-dimercaptosuccinic acid (DMSA) through a ligand-exchange process. U...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publications
2013-09-01
|
| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.31.9.807 |
| Summary: | Bare-magnetite nanocrystals with an average size of 10 nm, synthesized using the co-precipitation method, were functionalized with sodium oleate (SO) in aqueous media. The SO–magnetite nanocrystals were then functionalized with meso-dimercaptosuccinic acid (DMSA) through a ligand-exchange process. Ultrasonication of the magnetite promoted the ligand-exchange reaction; suitable functionalization with DMSA was achieved after 1 hour of contact. The actual functionalization of the nanocrystals was verified using Fourier transform infrared and Raman spectroscopy techniques. The adsorption capability of bare-magnetite, SO–magnetite and DMSA–magnetite nanocrystals for arsenate and arsenite aqueous species was assessed at different pHs. The DMSA–magnetite exhibited the maximum uptake capacity of 14.05 mg/g for arsenate species at a pH 6.5, whereas bare magnetite showed the highest uptake capacity of 11.53 mg/g for arsenite species at a pH 7.5. The adsorption isotherms fit the Freundlich model. Scatchard plots for arsenic species sorption suggested that the adsorption process took place via a single-step process. |
|---|---|
| ISSN: | 0263-6174 2048-4038 |