Simultaneous adsorption of Cd(II) and phosphate on Al13 pillared montmorillonite

Ma, Lingya, Zhu, Jianxi, Xi, Yunfei, Zhu, Runliang, He, Hongping, Liang, Xiaoliang, & Ayoko, Godwin A. (2015) Simultaneous adsorption of Cd(II) and phosphate on Al13 pillared montmorillonite. RSC Advances, 5(94), pp. 77227-77234.

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Abstract

Al13 pillared montmorillonites (AlPMts) prepared with different Al/clay ratios were used to remove Cd(II) and phosphate from aqueous solution. The structure of AlPMts was characterized by X-ray diffraction (XRD), Thermogravimetric analysis (TG), and N2 adsorption–desorption. The basal spacing, intercalated amount of Al13 cations, and specific surface area of AlPMts increased with the increase of the Al/clay ratio. In the single adsorption system, with the increase of the Al/clay ratio, the adsorption of phosphate on AlPMts increased but that of Cd(II) decreased. Significantly enhanced adsorptions of Cd(II) and phosphate on AlPMts were observed in a simultaneous system. For both contaminants, the adsorption of one contaminant would increase with the increase of the initial concentration of the other one and increase in the Al/clay ratio. The enhancement of the adsorption of Cd(II) was much higher than that of phosphate on AlPMt. This suggests that the intercalated Al13 cations are the primary co-adsorption sites for phosphate and Cd(II). X-ray photoelectron spectroscopy (XPS) indicated comparable binding energy of P2p but a different binding energy of Cd3d in single and simultaneous systems. The adsorption and XPS results suggested that the formation of P-bridge ternary surface complexes was the possible adsorption mechanism for promoted uptake of Cd(II) and phosphate on AlPMt.

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ID Code: 92194
Item Type: Journal Article
Refereed: Yes
Keywords: pillared montmorillonites, AlPMts
DOI: 10.1039/c5ra15744g
ISSN: 2046-2069
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 21 Jan 2016 04:52
Last Modified: 21 Jan 2016 22:18

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