Linked Life Data

19796874

Source:http://linkedlifedata.com/resource/pubmed/id/19796874

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-3
pubmed:dateCreated
2009-12-7
pubmed:abstractText
Removal of hexavalent chromium (Cr(VI)) from wastewater typically involves reduction of Cr(VI) to insoluble Cr(III) using zerovalent iron (Fe(0)) or ferrous iron (Fe(II)). This study investigates the effectiveness of Fe(II)-treated faujasite (zeolite Fe(II)-Y) for reduction of Cr(VI) and immobilization (adsorption/co-precipitation) of the Cr(III) reaction product. The Fe(II)-faujasite material effectively removed high concentrations of dissolved Cr(VI) from aqueous solution resulting in Cr solid loadings as high as 0.30 mmol Cr per gram Fe(II)-faujasite or approximately 1.5% Cr (w:w). Results of Cr K-edge X-ray absorption near edge spectroscopy (XANES) confirmed that the oxidation state of Cr in Cr(VI)-treated Fe(II)-faujasite was Cr(III). The local atomic structure of Cr was investigated by extended X-ray absorption fine structure (EXAFS) spectroscopy and the structure of Cr in the product was described by a Cr-O first shell of six O atoms at 1.98(+/-0.02)A plus a second atomic shell of metal (Cr, Fe) at 3.13(+/-0.02)A. The EXAFS results, combined with SEM imaging and X-ray diffraction analyses, suggested that the product of the reaction of Cr(VI) with Fe(II)-faujasite is primarily a poorly order Cr(x)Fe(1-x)(OH)(3) mixed phase similar to previous investigations of the reaction of Cr(VI) with Fe(0) and not solely Cr(III) bound directly to zeolite cation exchange sites.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1873-3336
pubmed:author
pubmed:issnType
Electronic
pubmed:day
15
pubmed:volume
174
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
167-74
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Reduction and immobilization of chromium(VI) by iron(II)-treated faujasite.
pubmed:affiliation
Department of Chemistry and Biochemistry, San Francisco State University, San Francisco, CA 94132, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't