Arsenic removal from natural groundwater using ‘green rust’: Solid phase stability and contaminant fate

Perez, Jeffrey Paulo H.; Schiefler, Adrian A.; Rubio, Sandra Navaz; Reischer, Markus; Overheu, Niels D.; Benning, Liane G.; Tobler, Dominique J.

doi:10.1016/j.jhazmat.2020.123327

Cited by 24 publications

(24 citation statements)

References 80 publications

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“…) displays the ability to remove arsenic (As) species and to be a host phase for As (Perez et al, 2021). It is, therefore, necessary to study the fate of Sb(V) sorbed on GR1(CO 3 2-…”

Section: Geochemical Significancementioning

confidence: 99%

Effect of Sb on precipitation of biogenic minerals during the reduction of Sb-bearing ferrihydrites

Zegeye

Carteret

Mallet

et al. 2021

Geochimica et Cosmochimica Acta

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“…) displays the ability to remove arsenic (As) species and to be a host phase for As (Perez et al, 2021). It is, therefore, necessary to study the fate of Sb(V) sorbed on GR1(CO 3 2-…”

Section: Geochemical Significancementioning

confidence: 99%

Effect of Sb on precipitation of biogenic minerals during the reduction of Sb-bearing ferrihydrites

Zegeye

Carteret

Mallet

et al. 2021

Geochimica et Cosmochimica Acta

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“…Upon reduction of Fe(III) oxides, the formation of secondary Fe(II)-containing minerals can also influence the partitioning of As between sediments and groundwater [7], [12,13]. With large surface to volume ratios, Fe(II)-bearing minerals such as Fe sulfides (pyrite, FeS2 or greigite, Fe3S4), Fe-carbonates (siderite, FeCO3), Fe-phosphates (vivianite, Fe3(PO4)2.8H2O), or Fe oxides (e.g., magnetite, Fe3O4) are each also able to sorb As to varying degrees, and can therefore retard As mobilization in groundwater [14][15][16][17]. For example, magnetite has been reported as the main secondary oxide and As carrier in Bangladesh sediments [18].…”

Section: Introductionmentioning

confidence: 99%

Vertical redox zones of Fe–S–As coupled mineralogy in the sediments of Hetao Basin – Constraints for groundwater As contamination

Wang

Göttlicher

Byrne

et al. 2021

Journal of Hazardous Materials

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The formation of iron-sulfur-arsenic (Fe-S-As) minerals during biogeochemical processes in As contaminated aquifers remains poorly understood despite their importance to understanding As release and transport in such systems. In this study, X-ray absorption and Mössbauer spectroscopies complemented by electron microscopy, and chemical extractions were used to examine vertical changes of As, Fe and S speciation for the example of sediments in the Hetao Basin.Reduction of Fe(III), As(V) and SO4 2species were shown to co-occur in the aquifers. Iron oxides were observed to be predominantly goethite and hematite (36 -12%) and appeared to decrease in abundance with depth. Furthermore, reduced As (including arsenite and As sulfides) and sulfur species (including S(-II), S(-I) and S 0 ) increased from 16% to 76% and from 13% to 44%, respectively.Iron oxides were the major As carrier in the sediments, and the lower groundwater As concentration consists with less desorbable and reducible As in the sediments. The formation of As-Fe sulfides (e.g., As containing pyrite and greigite) induced by redox heterogeneities likely contribute to localized lower groundwater As concentrations. These results help to further elucidate the complex relationship between biogeochemical processes and minerals formation in As contaminated aquifers.

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“…Therefore, we consider it safe to apply them directly into a groundwater aquifer and propose to use the SS900AT or SS900CO 2 + GR SO4 composite for in situ soil injection remediation. GR SO4 is a naturally occurring iron hydroxide with magnetite as oxidation product, which is a common iron oxide found in sediments 30,32 . GR SO4 is also considered safe for direct injection treatment of contaminated groundwater 29,31 …”

Section: Resultsmentioning

confidence: 99%

Reductive debromination of bromo‐substituted C2 aliphatics using a biochar–iron(II) composite

Lindhardt

Holm

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Tribromoethylene (TrBE), dibromoethylenes (DBEs) and 1,2‐dibromoethane (DBA) are widespread, toxic and persistent contaminants found in anaerobic soil and groundwater. The abiotic debromination of TrBE, DBEs and DBA using a layered iron(II)–iron(III) hydroxide (green rust, GR) with biochars acting as electron mediators was studied. A screening of biochar substrates was conducted. Reactive biochars were chosen for debromination of TrBE, DBEs and DBA in deionized water and groundwater. Post‐pyrolysis activation with CO2 was tested for reactivity enhancement. RESULTS Bone meal (BM) and shrimp shell (SS) biochars resulted in 60% and 90% debromination of TrBE, respectively. The SS biochar catalyzed debromination by elimination reactions of TrBE and DBEs resulting in formation of acetylene, while DBA was reduced to ethylene. All debrominations in deionized water followed pseudo‐first‐order kinetics with half‐lives t1/2 of 5.1, 1.3, 2.6 and 9.5 h for TrBE, cDBE, tDBE and DBA, respectively. For similar experiments in moderately hard groundwater, removal t1/2 values were on average 2.6 times slower, but still considered fast. Compared to removal t1/2 in deionized water, post‐pyrolysis activation with CO2 of an acid‐treated SS biochar produced a t1/2 11 times shorter for removal of TrBE and two times shorter for DBA. CONCLUSIONS Biochars are efficient mediators of reductive debromination of TrBE, DBEs and DBA. TrBE, DBEs and DBA can be effectively debrominated in deionized water and groundwater samples using a GR–SS biochar composite. The mediating ability of the SS biochar can be further improved by post‐pyrolysis CO2 activation. © 2022 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Arsenic removal from natural groundwater using ‘green rust’: Solid phase stability and contaminant fate

Cited by 24 publications

References 80 publications

Effect of Sb on precipitation of biogenic minerals during the reduction of Sb-bearing ferrihydrites

Effect of Sb on precipitation of biogenic minerals during the reduction of Sb-bearing ferrihydrites

Vertical redox zones of Fe–S–As coupled mineralogy in the sediments of Hetao Basin – Constraints for groundwater As contamination

Reductive debromination of bromo‐substituted C2 aliphatics using a biochar–iron(II) composite

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