Low temperature hydrogen production during experimental hydration of partially-serpentinized dunite

Miller, Hannah M.; Mayhew, L. E.; Ellison, Eric T.; Kelemen, P. B.; Kubo, Mike; Templeton, Alexis S.

doi:10.1016/j.gca.2017.04.022

Cited by 55 publications

(63 citation statements)

References 87 publications

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“…Reactions to form H2 or CH4 during olivine dissolution appear to be favored by the presence of magnetite, chromite or and/or other metal-rich minerals on the surface of olivine (Neubeck et al, 2011;Etiope et al, 2013Etiope et al, , 2017. Miller et al (2017) reported measurable production of H2 during the interaction of partially serpentinized Oman dunite in both artificial rainwater and artificial seawater at 100 o C during experiments that lasted only 9 months. The origin of the produced H2, however, was attributed to the presence of Fe 2+ in the original brucite present in the rock rather than from the abundant forsterite.…”

Section: The Generation Of Hydrogen and Methane From Olivine Dissolutmentioning

confidence: 95%

Olivine dissolution rates: A critical review

Declercq²,

et al. 2018

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The dissolution rates of olivine have been considered by a plethora of studies in part due to its potential to aid in carbon storage and its ease in obtaining pure samples for laboratory experiments. Due to the relative simplicity of its dissolution mechanism, most of these studies provide mutually consistent results such that a comparison of their rates can provide insight into the reactivity of silicate minerals as a whole. Olivine dissolution is controlled by the breaking of octahedral M 2+-oxygen bonds at or near the surface, liberating adjoining SiO4 4tetrahedra to the aqueous fluid. Aqueous species that adsorb to these bonds apparently accelerate their destruction. For example, the absorption of H + , H2O and, at some conditions, selected aqueous organic species will increase olivine dissolution rates. Nevertheless, other factors can slow olivine dissolution rates. Notably, olivine dissolution rates are slowed by lowering the surface area exposed to the reactive aqueous fluid, by for example the presence and/or growth on these surfaces of either microbes or secondary phases. The degree to which secondary phases decelerate rates

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Section: The Generation Of Hydrogen and Methane From Olivine Dissolutmentioning

confidence: 95%

Olivine dissolution rates: A critical review

Declercq²,

et al. 2018

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“…Furthermore, aquifers may contain dissolved hydrogen due to the hydration and oxidation of rocks and minerals (Miller et al, 2017). As an electron donor, hydrogen possesses several advantages in that it is inexpensive, widely available, and non-toxic (Rittmann et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Synchronous microbial vanadium (V) reduction and denitrification in groundwater using hydrogen as the sole electron donor

et al. 2018

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Groundwater co-contaminated by vanadium (V) (V(V)) and nitrate requires efficient remediation to prevent adverse environmental impacts. However, little is known about simultaneous bio-reductions of V(V) and nitrate supported by gaseous electron donors in aquifers. This study is among the first to examine microbial V(V) reduction and denitrification with hydrogen as the sole electron donor. V(V) removal efficiency of 91.0 ± 3.2% was achieved in test bioreactors within 7 d, with synchronous, complete removal of nitrate. V(V) was reduced to V(IV), which precipitated naturally under near-neutral conditions, and nitrate tended to be converted to nitrogen, both of which processes helped to purify the groundwater. Volatile fatty acids (VFAs) were produced from hydrogen oxidation. High-throughput 16S rRNA gene sequencing and metagenomic analyses revealed the evolutionary behavior of microbial communities and functional genes. The genera Dechloromonas and Hydrogenophaga promoted bio-reductions of V(V) and nitrate directly coupled to hydrogen oxidation. Enriched Geobacter and denitrifiers also indicated synergistic mechanism, with VFAs acting as organic carbon sources for heterotrophically functional bacteria while reducing V(V) and nitrate. These findings are likely to be useful in revealing biogeochemical fates of V(V) and nitrate in aquifer and developing technology for removing them simultaneously from groundwater.

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“…Brucite is often fine-grained and intimately intergrown with serpentine (e.g. [1,[13][14][15]), which can render it both difficult to detect and quantify in partially serpentinized rocks. Brucite can be detected at the bulk scale using X-ray Diffraction (XRD).…”

Section: Review (A) Brucite (Mg X Fe 2+mentioning

confidence: 99%

“…These drill chips were obtained in 2004 by the Ministry of Regional Municipalities, Environment and Water Resources of Oman. This sample has been previously characterized by Miller et al [13] by X-ray diffraction, EMPA and Raman spectroscopy. The optical mineralogy shows opaque magnetite in vein centres, colourless serpentine matrix, and orange-brown areas dominated by Fe-bearing brucite.…”

Section: Review (A) Brucite (Mg X Fe 2+mentioning

confidence: 99%

“…A significant portion of the Fe in partially serpentinized rocks resides in brucite [3,5,6,[8][9][10][11]. The Mg# of brucite (where Mg# = Mg/(Mg + Fe) mole ratio) can often vary from 0.95 to much lower values such as 0.65 when there is a notable Fe(OH) 2 component [2,12,13] (figure 1). Anomalously ferroan brucite, with Mg#s as low as 0.4 have also been observed in highly reduced mineral assemblages in serpentinite [14].…”

Section: Review (A) Brucite (Mg X Fe 2+mentioning

confidence: 99%

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