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Phosphate effects on cadmium(II) sorption to ferrihydrite

Tiberg, Charlotta and Gustafsson, Jon Petter (2016). Phosphate effects on cadmium(II) sorption to ferrihydrite. Journal Of Colloid And Interface Science. 471, 103-111
[Journal article]

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Official URL: http://dx.doi.org/10.1016/j.jcis.2016.03.016

Abstract

Hypothesis: Phosphate influences the sorption of metals to iron (hydr)oxides. An enhanced formation of inner-sphere complexes on the (hydr)oxide surface can be attributed to electrostatic interactions and/or to changes in metal coordination on the iron (hydr)oxide surface. Phosphate was expected to increase cadmium(II) sorption on ferrihydrite. It should be possible to identify changes in cadmium(II) coordination upon phosphate addition by Extended X-ray absorption fine structure (EXAFS) spectroscopy and implement the identified complexes in a surface complexation model (SCM).Experiments: The effect of phosphate addition on cadmium(II) sorption to ferrihydrite was studied by a series of batch experiments covering the pH range from 4 to 8. EXAFS spectroscopy was performed on ferrihydrite from the batch experiments at the cadmium K edge. The identified surface complexes were incorporated in the Charge distribution multisite complexation (CD-MUSIC) model, and new surface complexation constants were optimized.Findings: Without phosphate addition cadmium(II) formed inner-sphere bidentate complexes on the ferrihydrite surface. With phosphate there was an increased cadmium(II) sorption that could not be explained by electrostatic interactions alone. The enhancement was best explained by the formation of a ternary complex including cadmium(II), phosphate and ferrihydrite surface groups.

Authors/Creators:Tiberg, Charlotta and Gustafsson, Jon Petter
Title:Phosphate effects on cadmium(II) sorption to ferrihydrite
Series/Journal:Journal Of Colloid And Interface Science (1095-7103)
Year of publishing :2016
Volume:471
Page range:103-111
Number of Pages:9
Publisher:Elsevier
ISSN:1095-7103
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Restricted
Agris subject categories.:X Agricola extesions > X50 Chemistry
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Inorganic Chemistry
Agrovoc terms:sorption, phosphates, cadmium, chemistry
Keywords:Iron oxide, Iron hydroxide, Adsorption, Extended X-ray absorption spectroscopy (EXAFS), Charge distribution multisite complexation (CD-MUSIC), Surface complex, Cadmium (Cd), Phosphate
URN:NBN:urn:nbn:se:slu:epsilon-e-3594
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3594
Additional ID:
Type of IDID
Web of Science (WoS)000374511900014
ID Code:13532
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:18 Aug 2016 06:17
Metadata Last Modified:18 Aug 2016 06:17

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