Boron isotopic fractionation in aqueous boric acid solutions over synthetic minerals: Effect of layer and surface charge on fractionation factor
Source abstract
Abstract
Abstract Boron isotopic fractionation in boric acid solutions during adsorption on synthetic manganese oxides (birnessite “B” and cryptomelane “C”) and Mg–Al-layered double hydroxide “LDH” was investigated. The materials were characterized by elemental analyses, powder X-ray diffraction, FTIR spectra, BET surface area and zeta potential measurements. Batch experiments were conducted without changing the solution pH to correlate the boron sorption properties of the adsorbents with isotopic fractionation in the associated boric acid solutions. The results showed that boron isotopic composition of the contact solution is heavily dependent on the selective adsorption of B(OH)3 or B(OH)4− species due to the charge properties of the minerals. With B and C, possessing negatively charged surfaces, 10B(OH)4− was preferentially fractionated in the solution due to the transfer of the Lewis acidic 11B(OH)3 species while with LDH selective adsoption of 10B(OH)4− by positive layers was favorable resulting in the enrichment of the heavier isotope in the solution.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Layered Double Hydroxides Synthesis and Applications · Chemical Synthesis and Characterization · Geochemistry and Elemental Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (29)
Show source-provided references
1. Layered double hydroxides with interlayer borate anions: a critical evaluation of synthesis methodology and pH-independent orientations in nanogalleries10.1016/j.clay.2010.12.015 ↗
2. A critical evaluation of the thermodynamic data for boron ions, ion pairs, complexes, and polyanions in aqueous solution at 298.15K and 1bar10.1016/0016-7037(80)90069-1 ↗
3. Hydrotalcite-type anionic clays: preparation, properties and applications10.1016/0920-5861(91)80068-K ↗
4. Time-dependent CO2 sorption hysteresis in a one-dimensional microporous octahedral molecular sieve10.1021/ja3014133 ↗
5. Garrett · 1998
6. The interaction of boron with goethite: experiments and CD–MUSIC modeling10.1016/j.chemosphere.2010.11.034 ↗
7. Boron isotopic composition and concentration in modern marine carbonates10.1016/0016-7037(92)90151-8 ↗
8. Mineral fluid partitioning and isotopic fractionation of boron in synthetic calcium carbonate10.1016/0016-7037(95)00288-B ↗
9. Hosmane · 2012
10. Experimental measurements of boron isotope fractionation in seawater10.1016/j.epsl.2006.05.034 ↗
11. Boron isotopic fractionation related to boron sorption on humic acid and the structure of surface complexes formed10.1016/j.gca.2005.02.024 ↗
12. How surface complexes impact boron isotope fractionation: evidence from Fe and Me oxide sorption experiments10.1016/j.epsl.2007.05.039 ↗
13. Ab initio molecular orbital calculations of reduced partition function ratios of polyboric acids and polyborate anions10.1515/zna-2000-6-710 ↗
14. Critical evaluation of the boron isotope pH-proxy: the accuracy of ancient ocean pH estimates10.1016/j.gca.2004.07.029 ↗
15. Temperature and pH controls over isotopic fractionation during absorption of boron on marine clay10.1016/0016-7037(87)90285-7 ↗
16. ATR-FTIR spectroscopic studies of boric acid adsorption on hydrous ferric oxide10.1016/S0016-7037(03)00096-6 ↗
17. Manganese oxide minerals: crystal structures and economic and environmental significance10.1073/pnas.96.7.3447 ↗
18. Sorption of borate onto layered double hydroxides assembled on filter paper through in situ hydrothermal crystallization10.1016/j.clay.2013.12.003 ↗
19. 2001
20. Boron isotopic fractionation between minerals and fluids: new insights from in situ high pressure–high temperature vibrational spectroscopic data10.1016/j.gca.2005.03.054 ↗
21. Seawater pH control on the boron isotopic composition of calcite: evidence from inorganic calcite precipitation experiments10.1016/S0016-7037(99)00437-8 ↗
22. Borate raw materials
23. Boron isotope exhange between seawater and ocean crust10.1016/0016-7037(87)90198-0 ↗
24. Removal of boron species by layered double hydroxides: a review10.1016/j.jcis.2013.03.051 ↗
25. Weicher · 1963 · 2406
26. The geochemical cycle of boron: constraints from boron isotope partitioning experiments between mica and fluid10.1016/j.lithos.2005.02.003 ↗
27. An unusual isotopic fractionation of boron in synthetic calcium carbonate precipitated from seawater and saline water
28. Boron isotope fractionation during brucite deposition from artificial seawater10.5194/cp-7-693-2011 ↗
29. Stable boron isotope fractionation between dissolved B(OH)3 and B(OH)4−10.1016/j.gca.2004.12.011 ↗