Synergistic adsorption of Cd(II) with sulfate/phosphate on ferrihydrite: An in situ ATR-FTIR/2D-COS study

Jing Liu, Runliang Zhu, Xiaoliang Liang, Lingya Ma, Xiaoju Lin, Jianxi Zhu, Hongping He, Stephen C. Parker, Marco Molinari

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Elucidation of the co-adsorption characteristics of heavy metal cations and oxyanions on (oxyhydr)oxides can help to better understand their distribution and transformation in many geological settings. In this work, batch adsorption experiments in combination with in situ attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) were applied to explore the interaction mechanisms of Cd(II) with sulfate or phosphate at the ferrihydrite (Fh)-water interface, and the two-dimensional correlation spectroscopic analysis (2D-COS) was used to enhance the resolution of ATR-FTIR bands and the accuracy of analysis. The batch adsorption experiments showed enhanced adsorption of both sulfate (S) and phosphate (P) on Fh when co-adsorbed with Cd(II); additionally, the desorbed percentages of Cd(II) were much lower in the P + Cd adsorption systems than those in the S + Cd adsorption systems. The spectroscopic results suggested that in the single adsorption systems, sulfate primarily adsorbed as outer-sphere complexes with a small amount of bidentate inner-sphere complexes, while the dominant adsorbed species of phosphate were largely the bidentate nonprotonated inner-sphere complexes, although there was significant pH-dependence. In the co-adsorption systems, the synergistic adsorption of Cd(II) and sulfate was dominantly attributed to the electrostatic interaction, as well as the formation of Fe-Cd-S (i.e., Cd-bridged) ternary complexes. In contrast, Fe-P-Cd (i.e., phosphate-bridged) ternary complexes were found in all of the co-adsorption systems of phosphate and Cd(II); furthermore, electrostatic interaction should also contribute to the co-adsorption process. Our results show that in situ ATR-FTIR in combination with 2D-COS can be an efficient tool in analyzing the co-adsorption mechanisms of anions and heavy metal cations on iron (oxyhydr)oxides in ternary adsorption systems. The co-existence of Cd(II) with sulfate or phosphate can be beneficial for their accumulations on Fh, and phosphate is more efficient than sulfate for the long-term immobilization of Cd(II).

LanguageEnglish
Pages12-21
Number of pages10
JournalChemical Geology
Volume477
Early online date8 Dec 2017
DOIs
Publication statusPublished - 20 Jan 2018

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ferrihydrite
FTIR spectroscopy
Sulfates
reflectance
Phosphates
phosphate
sulfate
adsorption
Adsorption
Heavy Metals
Coulomb interactions
in situ
Cations
cation
heavy metal
Spectroscopic analysis
iron oxide
immobilization
Oxides
coexistence

Cite this

Liu, Jing ; Zhu, Runliang ; Liang, Xiaoliang ; Ma, Lingya ; Lin, Xiaoju ; Zhu, Jianxi ; He, Hongping ; Parker, Stephen C. ; Molinari, Marco. / Synergistic adsorption of Cd(II) with sulfate/phosphate on ferrihydrite : An in situ ATR-FTIR/2D-COS study. In: Chemical Geology. 2018 ; Vol. 477. pp. 12-21.
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Synergistic adsorption of Cd(II) with sulfate/phosphate on ferrihydrite : An in situ ATR-FTIR/2D-COS study. / Liu, Jing; Zhu, Runliang; Liang, Xiaoliang; Ma, Lingya; Lin, Xiaoju; Zhu, Jianxi; He, Hongping; Parker, Stephen C.; Molinari, Marco.

In: Chemical Geology, Vol. 477, 20.01.2018, p. 12-21.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synergistic adsorption of Cd(II) with sulfate/phosphate on ferrihydrite

T2 - Chemical Geology

AU - Liu, Jing

AU - Zhu, Runliang

AU - Liang, Xiaoliang

AU - Ma, Lingya

AU - Lin, Xiaoju

AU - Zhu, Jianxi

AU - He, Hongping

AU - Parker, Stephen C.

AU - Molinari, Marco

PY - 2018/1/20

Y1 - 2018/1/20

N2 - Elucidation of the co-adsorption characteristics of heavy metal cations and oxyanions on (oxyhydr)oxides can help to better understand their distribution and transformation in many geological settings. In this work, batch adsorption experiments in combination with in situ attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) were applied to explore the interaction mechanisms of Cd(II) with sulfate or phosphate at the ferrihydrite (Fh)-water interface, and the two-dimensional correlation spectroscopic analysis (2D-COS) was used to enhance the resolution of ATR-FTIR bands and the accuracy of analysis. The batch adsorption experiments showed enhanced adsorption of both sulfate (S) and phosphate (P) on Fh when co-adsorbed with Cd(II); additionally, the desorbed percentages of Cd(II) were much lower in the P + Cd adsorption systems than those in the S + Cd adsorption systems. The spectroscopic results suggested that in the single adsorption systems, sulfate primarily adsorbed as outer-sphere complexes with a small amount of bidentate inner-sphere complexes, while the dominant adsorbed species of phosphate were largely the bidentate nonprotonated inner-sphere complexes, although there was significant pH-dependence. In the co-adsorption systems, the synergistic adsorption of Cd(II) and sulfate was dominantly attributed to the electrostatic interaction, as well as the formation of Fe-Cd-S (i.e., Cd-bridged) ternary complexes. In contrast, Fe-P-Cd (i.e., phosphate-bridged) ternary complexes were found in all of the co-adsorption systems of phosphate and Cd(II); furthermore, electrostatic interaction should also contribute to the co-adsorption process. Our results show that in situ ATR-FTIR in combination with 2D-COS can be an efficient tool in analyzing the co-adsorption mechanisms of anions and heavy metal cations on iron (oxyhydr)oxides in ternary adsorption systems. The co-existence of Cd(II) with sulfate or phosphate can be beneficial for their accumulations on Fh, and phosphate is more efficient than sulfate for the long-term immobilization of Cd(II).

AB - Elucidation of the co-adsorption characteristics of heavy metal cations and oxyanions on (oxyhydr)oxides can help to better understand their distribution and transformation in many geological settings. In this work, batch adsorption experiments in combination with in situ attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) were applied to explore the interaction mechanisms of Cd(II) with sulfate or phosphate at the ferrihydrite (Fh)-water interface, and the two-dimensional correlation spectroscopic analysis (2D-COS) was used to enhance the resolution of ATR-FTIR bands and the accuracy of analysis. The batch adsorption experiments showed enhanced adsorption of both sulfate (S) and phosphate (P) on Fh when co-adsorbed with Cd(II); additionally, the desorbed percentages of Cd(II) were much lower in the P + Cd adsorption systems than those in the S + Cd adsorption systems. The spectroscopic results suggested that in the single adsorption systems, sulfate primarily adsorbed as outer-sphere complexes with a small amount of bidentate inner-sphere complexes, while the dominant adsorbed species of phosphate were largely the bidentate nonprotonated inner-sphere complexes, although there was significant pH-dependence. In the co-adsorption systems, the synergistic adsorption of Cd(II) and sulfate was dominantly attributed to the electrostatic interaction, as well as the formation of Fe-Cd-S (i.e., Cd-bridged) ternary complexes. In contrast, Fe-P-Cd (i.e., phosphate-bridged) ternary complexes were found in all of the co-adsorption systems of phosphate and Cd(II); furthermore, electrostatic interaction should also contribute to the co-adsorption process. Our results show that in situ ATR-FTIR in combination with 2D-COS can be an efficient tool in analyzing the co-adsorption mechanisms of anions and heavy metal cations on iron (oxyhydr)oxides in ternary adsorption systems. The co-existence of Cd(II) with sulfate or phosphate can be beneficial for their accumulations on Fh, and phosphate is more efficient than sulfate for the long-term immobilization of Cd(II).

KW - 2D-COS

KW - ATR-FTIR

KW - Cadmium

KW - Ferrihydrite

KW - Phosphate

KW - Sulfate

KW - Synergistic adsorption

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JO - Chemical Geology

JF - Chemical Geology

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