The role of Al-Goethites on arsenate mobility

Silva, J, Mello, JWV, Gasparon, M, Abrahao, WAP, Ciminelli, VST and Jong, T (2010) The role of Al-Goethites on arsenate mobility. Water Research, 44 19: 5684-5692. doi:10.1016/j.watres.2010.06.056

Author Silva, J
Mello, JWV
Gasparon, M
Abrahao, WAP
Ciminelli, VST
Jong, T
Title The role of Al-Goethites on arsenate mobility
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2010-11-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2010.06.056
Open Access Status Not Open Access
Volume 44
Issue 19
Start page 5684
End page 5692
Total pages 9
Place of publication London, United Kingdom
Publisher IWA Publishing
Language eng
Formatted abstract
The geochemical fates of Fe and As are so closely correlated that methods of As removal from contaminated water are in general based on the high affinity of this metalloid for Fe (hydr)oxides. Dissimilatory Fe reducing bacteria, however, play a fundamental role in catalysing the redox transformations that ultimately control the mobility of As in anoxic environments. The potential of Al-goethites in adsorbing As(V) compared with hematite, goethite, ferrihydrite, and gibbsite, and the stability of As retained by the Fe compounds under anoxic conditions were investigated in this study. The (hydr)oxides were synthesised, and adsorption isotherms and As(V) adsorption maxima at different pH were measured. Arsenic loaded samples were anaerobically incubated in the presence of Shewanella putrefaciens, and periodically sampled to evaluate the contents of soluble As and Fe. The As(V) adsorption maxima decreased in the following order: Fh > AlGt13 > AlGt20 > AlGt23 > Gb > Hm > Gt. In terms of surface area, Gb, Gt, and Hm showed higher As(V) loading capacity than Fh, suggesting available reactive sites not fully occupied by arsenate on Fh. The same hypothesis can be considered for Al-goethites, as they showed even lower arsenate loading capacity per surface area. The presence of structural Al in the goethites enhanced considerably the As uptake capacity and stability under reducing conditions. Therefore, the Al-goethites showed good potential as adsorbents to remove As from water. S. putrefaciens cells were able to utilise both noncrystalline and crystalline Fe (hydr)oxides as electron acceptors, releasing As into solution. Al-goethites showed a decrease in Fe and As mobilisation as structural Al increased. © 2010 Elsevier Ltd.
Keyword Arsenic
Redox stability
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Issue 'Groundwater Arsenic: From Genesis to Sustainable Remediation' Edited by Jochen Bundschuh, Prosun Bhattacharya, Jan Hoinkis, Nalan Kabay, Jiin-Shuh Jean and Marta I. Litter.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 25 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 30 Jan 2011, 10:00:07 EST