Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite

Liu, Jing, Zhu, Runliang, Xu, Tianyuan, Xu, Yin, Ge, Fei, Xi, Yunfei, Zhu, Jianxi, & He, Hongping (2016) Co-adsorption of phosphate and zinc(II) on the surface of ferrihydrite. Chemosphere, 144, pp. 1148-1155.

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Abstract

Ferrihydrite (Fh) is of great importance in affecting the migration and transformation of heavy-metal cations and oxyanions. To advance the understanding of co-adsorption reactions on Fh surface, the co-adsorption of phosphate and Zn(II) from aqueous solution to a synthesized Fh was determined. The batch experiments demonstrated a synergistic adsorption of phosphate and Zn(II) on Fh. In the pH range of 3.5 to 6, the adsorption of the two contaminants showed strong pH dependence in the single solute adsorption systems, but the dependence alleviated in the simultaneous adsorption system. X-ray photoelectron spectroscopy (XPS) revealed that the chemical shifts of Zn 2p1/2 and Zn 2p3/2 binding energies were more significant than that of P 2p in the single and simultaneous adsorption systems. On the other side, in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) suggested increased formation of outer- and inner-sphere complexes of phosphate in the simultaneous system. Thus, the synergistic adsorption of the two contaminants could be attributed to the formation of ternary complexes as well as electrostatic interactions, while surface precipitation could not be completely ruled out. On the basis of the results from both the batch adsorption experiments and structural characterization, these two contaminants were likely to form phosphate-bridged ternary complexes (≡Fe-P-Zn) on Fh in the simultaneous adsorption system.

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ID Code: 98381
Item Type: Journal Article
Refereed: Yes
Keywords: Ferrihydrite, Zinc, Phosphate, Co-adsorption, Ternary complexes
DOI: 10.1016/j.chemosphere.2015.09.083
ISSN: 0045-6535
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000)
Divisions: Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
  • NNSF/41572031
  • NNSF/41322014
  • CAS-SAFEA/20140491534
  • GUANGDONG TOP-NOTCH/2014TQ01Z249
Copyright Owner: Copyright 2016 Elsevier
Copyright Statement: Licensed under the Creative Commons Attribution; Non-Commercial; No-Derivatives 4.0 International. DOI 10.1016/j.chemosphere.2015.09.083
Deposited On: 25 Aug 2016 03:17
Last Modified: 29 Aug 2016 16:34

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