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Interaction of Zn(II) with Hematite Nanoparticles and Microparticles: Part 2. ATR-FTIR and EXAFS Study of the Aqueous Zn(II)/Oxalate/Hematite Ternary System
Abstract
Sorption of Zn(II) to hematite nanoparticles (HN) (av diam=10.5 nm) and microparticles (HM) (av diam=550 nm) was studied in the presence of oxalate anions (Ox2-(aq)) in aqueous solutions as a function of total Zn(II)(aq) to total Ox2-(aq) concentration ratio (R=[Zn(II)(aq)]tot/[Ox2-(aq)]tot) at pH 5.5. Zn(II) uptake is similar in extent for both the Zn(II)/Ox/HN and Zn(II)/Ox/HM ternary systems and the Zn(II)/HN binary system at [Zn(II)(aq)](tot)<4 mM, whereas it is 50-100% higher for the Zn(II)/Ox/HN system than for the Zn(II)/Ox/HM ternary and the Zn(II)/HN and Zn(II)/HM binary systems at [Zn(II)(aq)]tot>4 mM. In contrast, Zn(II) uptake for the Zn(II)/HM binary system is a factor of 2 greater than that for the Zn(II)/Ox/HM and Zn(II)/Ox/HN ternary systems and the Zn(II)/HN binary system at [Zn(II)(aq)]tot<4 mM. In the Zn(II)/Ox/HM ternary system at both R values examined (0.16 and 0.68), attenuated total reflectance Fourier transform infrared (ATR-FTIR) results are consistent with the presence of inner-sphere oxalate complexes and outer-sphere ZnOx(aq) complexes, and/or type A ternary complexes. In addition, extended X-ray absorption fine structure (EXAFS) spectroscopic results suggest that type A ternary surface complexes (i.e., >O2-Zn-Ox) are present. In the Zn(II)/Ox/HN ternary system at R=0.15, ATR-FTIR results indicate the presence of inner-sphere oxalate and outer-sphere ZnOx(aq) complexes; the EXAFS results provide no evidence for inner-sphere Zn(II) complexes or type A ternary complexes. In contrast, ATR-FTIR results for the Zn/Ox/HN sample with R = 0.68 are consistent with a ZnOx(s)-like surface precipitate and possibly type B ternary surface complexes (i.e., >O2-Ox-Zn). EXAFS results are also consistent with the presence of ZnOx(s)-like precipitates. We ascribe the observed increase of Zn(II)(aq) uptake in the Zn(II)/Ox/HN ternary system at [Zn(II)(aq)]tot>or=4 mM relative to the Zn(II)/Ox/HM ternary system to formation of a ZnOx(s)-like precipitate at the hematite nanoparticle/water interface.
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“Recently, Ha et al. [23, 24] found that even variations in hematite particle sizes (nanoparticles with average diameter of 10.5 nm and microparticles with average diameter of 550 nm) affect the modes of Zn sorption, leading to the formation of different types of surface complexes and/or precipitates.”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [24]
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“The structure of sorbed species determines their stability on the sorbents [23, 24].”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [24]
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Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments
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Metadata
- Authors
- Ha, J., Trainor, T. P., Farges, F., & Brown, G. E.
- Affiliations
- Stanford University (US)
- University of Alaska Fairbanks (US)
- Centre National de la Recherche Scientifique (FR)
- SLAC National Accelerator Laboratory (US)
- Corresponding author
- Ha, Juyoung
- ORCID
- Ha, Juyoung
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-03-30
- Volume
- 25
- Issue
- 10
- Pages
- 5586-5593
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W1989284934
- Cited by
- 26
- References
- 38
- Citations by year
- 2026: 1 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 1 · 2018: 5 · 2017: 2 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 1 · 2012: 3
- FWCI
- 2.40
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Langmuir (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Materials Science › Materials Chemistry › Iron oxide chemistry and applications
- Physical Sciences › Environmental Science › Environmental Engineering › Environmental remediation with nanomaterials
- Keywords
- hematite nanoparticles, oxalate, ternary surface complexes, inner-sphere complexes, outer-sphere complexes, zinc adsorption, surface complexation, EXAFS, ATR-FTIR spectroscopy, pH 5.5, ternary systems, iron oxide, adsorption selectivity, particle size
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- CoChat. (2026). Citation check: Interaction of Zn(II) with Hematite Nanoparticles and Microparticles: Part 2. ATR-FTIR and EXAFS Study of the Aqueous Zn(II)/Oxalate/Hematite Ternary System. https://app.cochat.ai/papers/10.1021/la802895a
- The paper
- Ha, J., Trainor, T. P., Farges, F., & Brown, G. E. (2009). Interaction of Zn(II) with Hematite Nanoparticles and Microparticles: Part 2. ATR-FTIR and EXAFS Study of the Aqueous Zn(II)/Oxalate/Hematite Ternary System. Langmuir. https://doi.org/10.1021/la802895a
