Structural study of Fe(II) adsorption on hematite ( 1 1 ¯ 02 )
The structure of α - Fe 2 O 3 ( 1 1 ¯ 02 ) reacted with Fe(II) under anoxic conditions was studied using crystal truncation rod (CTR) diffraction. The CTR results show the crystalline termination of α - Fe 2 O 3 ( 1 1 ¯ 02 ) is modified due to adsorption of Fe(II) at crystallographic lattice sites....
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| Veröffentlicht in: | Geochimica et cosmochimica acta 2008-07, Vol.72 (14), p.3311-3325 |
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| container_title | Geochimica et cosmochimica acta |
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| creator | Tanwar, Kunaljeet S. Petitto, Sarah C. Ghose, Sanjit K. Eng, Peter J. Trainor, Thomas P. |
| description | The structure of
α
-
Fe
2
O
3
(
1
1
¯
02
)
reacted with Fe(II) under anoxic conditions was studied using crystal truncation rod (CTR) diffraction. The CTR results show the crystalline termination of
α
-
Fe
2
O
3
(
1
1
¯
02
)
is modified due to adsorption of Fe(II) at crystallographic lattice sites. In addition, the binding sites for adsorbed Fe are similar for all studied conditions: reaction for 2
h at pH 5.0, for 34
d at pH 5.0, and for 5.5
h at pH 7.0. The occupancy of adsorbed Fe increases with both reaction time and pH, which is consistent with typical cation adsorption behavior on iron (hydr)oxide surfaces. The metal–oxygen bond lengths of the (ordered) surface Fe atoms are characteristic of Fe(III), which provides indirect evidence for oxidation of adsorbed Fe(II) and is consistent with recent studies indicating that Fe(III)-hydroxides are effective oxidants for dissolved ferrous iron. Grazing-incidence X-ray diffraction measurements indicate that no crystalline surface reaction products formed during the course of Fe(II) reaction. Overall, the structural characterization of the Fe(II) adsorption reaction results in an enhanced understanding of how reduced iron affects the structure, stability and reactivity of hematite. |
| doi_str_mv | 10.1016/j.gca.2008.04.020 |
| format | Article |
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α
-
Fe
2
O
3
(
1
1
¯
02
)
reacted with Fe(II) under anoxic conditions was studied using crystal truncation rod (CTR) diffraction. The CTR results show the crystalline termination of
α
-
Fe
2
O
3
(
1
1
¯
02
)
is modified due to adsorption of Fe(II) at crystallographic lattice sites. In addition, the binding sites for adsorbed Fe are similar for all studied conditions: reaction for 2
h at pH 5.0, for 34
d at pH 5.0, and for 5.5
h at pH 7.0. The occupancy of adsorbed Fe increases with both reaction time and pH, which is consistent with typical cation adsorption behavior on iron (hydr)oxide surfaces. The metal–oxygen bond lengths of the (ordered) surface Fe atoms are characteristic of Fe(III), which provides indirect evidence for oxidation of adsorbed Fe(II) and is consistent with recent studies indicating that Fe(III)-hydroxides are effective oxidants for dissolved ferrous iron. Grazing-incidence X-ray diffraction measurements indicate that no crystalline surface reaction products formed during the course of Fe(II) reaction. Overall, the structural characterization of the Fe(II) adsorption reaction results in an enhanced understanding of how reduced iron affects the structure, stability and reactivity of hematite.</description><identifier>ISSN: 0016-7037</identifier><identifier>EISSN: 1872-9533</identifier><identifier>DOI: 10.1016/j.gca.2008.04.020</identifier><language>eng</language><publisher>United States: Elsevier Ltd</publisher><subject>ADSORPTION ; BOND LENGTHS ; CRYSTAL STRUCTURE ; GEOSCIENCES ; HEMATITE ; IRON ; IRON OXIDES ; OXIDATION ; OXIDIZERS ; SORPTIVE PROPERTIES ; STABILITY ; X-RAY DIFFRACTION</subject><ispartof>Geochimica et cosmochimica acta, 2008-07, Vol.72 (14), p.3311-3325</ispartof><rights>2008 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a1926-f3c70ec8bf3991ed75739abb15e950c33f65856fb37b8e27ececc02e5c3b01eb3</citedby><cites>FETCH-LOGICAL-a1926-f3c70ec8bf3991ed75739abb15e950c33f65856fb37b8e27ececc02e5c3b01eb3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.gca.2008.04.020$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,780,784,885,3548,27923,27924,45994</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/1006716$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Tanwar, Kunaljeet S.</creatorcontrib><creatorcontrib>Petitto, Sarah C.</creatorcontrib><creatorcontrib>Ghose, Sanjit K.</creatorcontrib><creatorcontrib>Eng, Peter J.</creatorcontrib><creatorcontrib>Trainor, Thomas P.</creatorcontrib><creatorcontrib>Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)</creatorcontrib><title>Structural study of Fe(II) adsorption on hematite ( 1 1 ¯ 02 )</title><title>Geochimica et cosmochimica acta</title><description>The structure of
α
-
Fe
2
O
3
(
1
1
¯
02
)
reacted with Fe(II) under anoxic conditions was studied using crystal truncation rod (CTR) diffraction. The CTR results show the crystalline termination of
α
-
Fe
2
O
3
(
1
1
¯
02
)
is modified due to adsorption of Fe(II) at crystallographic lattice sites. In addition, the binding sites for adsorbed Fe are similar for all studied conditions: reaction for 2
h at pH 5.0, for 34
d at pH 5.0, and for 5.5
h at pH 7.0. The occupancy of adsorbed Fe increases with both reaction time and pH, which is consistent with typical cation adsorption behavior on iron (hydr)oxide surfaces. The metal–oxygen bond lengths of the (ordered) surface Fe atoms are characteristic of Fe(III), which provides indirect evidence for oxidation of adsorbed Fe(II) and is consistent with recent studies indicating that Fe(III)-hydroxides are effective oxidants for dissolved ferrous iron. Grazing-incidence X-ray diffraction measurements indicate that no crystalline surface reaction products formed during the course of Fe(II) reaction. Overall, the structural characterization of the Fe(II) adsorption reaction results in an enhanced understanding of how reduced iron affects the structure, stability and reactivity of hematite.</description><subject>ADSORPTION</subject><subject>BOND LENGTHS</subject><subject>CRYSTAL STRUCTURE</subject><subject>GEOSCIENCES</subject><subject>HEMATITE</subject><subject>IRON</subject><subject>IRON OXIDES</subject><subject>OXIDATION</subject><subject>OXIDIZERS</subject><subject>SORPTIVE PROPERTIES</subject><subject>STABILITY</subject><subject>X-RAY DIFFRACTION</subject><issn>0016-7037</issn><issn>1872-9533</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNp9kMFKw0AQhhdRsFYfwNviqR4SZ7PdbIIHkWK1UPCgnpfNZGJT2qTsboU-le_gk7mhnmUG5vL9P8PH2LWAVIDI79bpJ9o0AyhSmKaQwQkbiUJnSamkPGUjiFCiQepzduH9GgC0UjBiD2_B7THsnd1wH_b1gfcNn9Nksbjltva924W273jcFW1taAPxCRdxfr45ZPz2kp01duPp6u-O2cf86X32kixfnxezx2ViRZnlSSNRA2FRNbIsBdVaaVnaqhKKSgUoZZOrQuVNJXVVUKYJCREyUigrEFTJMbs59vY-tMZjfARX2HcdYTACINcij5A4Quh67x01ZufarXWHSJhBk1mbqMkMmgxMTdQUM_fHDMXvv1pyQzl1SHXrhu66b_9J_wKAm21O</recordid><startdate>20080715</startdate><enddate>20080715</enddate><creator>Tanwar, Kunaljeet S.</creator><creator>Petitto, Sarah C.</creator><creator>Ghose, Sanjit K.</creator><creator>Eng, Peter J.</creator><creator>Trainor, Thomas P.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20080715</creationdate><title>Structural study of Fe(II) adsorption on hematite ( 1 1 ¯ 02 )</title><author>Tanwar, Kunaljeet S. ; Petitto, Sarah C. ; Ghose, Sanjit K. ; Eng, Peter J. ; Trainor, Thomas P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a1926-f3c70ec8bf3991ed75739abb15e950c33f65856fb37b8e27ececc02e5c3b01eb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>ADSORPTION</topic><topic>BOND LENGTHS</topic><topic>CRYSTAL STRUCTURE</topic><topic>GEOSCIENCES</topic><topic>HEMATITE</topic><topic>IRON</topic><topic>IRON OXIDES</topic><topic>OXIDATION</topic><topic>OXIDIZERS</topic><topic>SORPTIVE PROPERTIES</topic><topic>STABILITY</topic><topic>X-RAY DIFFRACTION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tanwar, Kunaljeet S.</creatorcontrib><creatorcontrib>Petitto, Sarah C.</creatorcontrib><creatorcontrib>Ghose, Sanjit K.</creatorcontrib><creatorcontrib>Eng, Peter J.</creatorcontrib><creatorcontrib>Trainor, Thomas P.</creatorcontrib><creatorcontrib>Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Geochimica et cosmochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tanwar, Kunaljeet S.</au><au>Petitto, Sarah C.</au><au>Ghose, Sanjit K.</au><au>Eng, Peter J.</au><au>Trainor, Thomas P.</au><aucorp>Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Structural study of Fe(II) adsorption on hematite ( 1 1 ¯ 02 )</atitle><jtitle>Geochimica et cosmochimica acta</jtitle><date>2008-07-15</date><risdate>2008</risdate><volume>72</volume><issue>14</issue><spage>3311</spage><epage>3325</epage><pages>3311-3325</pages><issn>0016-7037</issn><eissn>1872-9533</eissn><abstract>The structure of
α
-
Fe
2
O
3
(
1
1
¯
02
)
reacted with Fe(II) under anoxic conditions was studied using crystal truncation rod (CTR) diffraction. The CTR results show the crystalline termination of
α
-
Fe
2
O
3
(
1
1
¯
02
)
is modified due to adsorption of Fe(II) at crystallographic lattice sites. In addition, the binding sites for adsorbed Fe are similar for all studied conditions: reaction for 2
h at pH 5.0, for 34
d at pH 5.0, and for 5.5
h at pH 7.0. The occupancy of adsorbed Fe increases with both reaction time and pH, which is consistent with typical cation adsorption behavior on iron (hydr)oxide surfaces. The metal–oxygen bond lengths of the (ordered) surface Fe atoms are characteristic of Fe(III), which provides indirect evidence for oxidation of adsorbed Fe(II) and is consistent with recent studies indicating that Fe(III)-hydroxides are effective oxidants for dissolved ferrous iron. Grazing-incidence X-ray diffraction measurements indicate that no crystalline surface reaction products formed during the course of Fe(II) reaction. Overall, the structural characterization of the Fe(II) adsorption reaction results in an enhanced understanding of how reduced iron affects the structure, stability and reactivity of hematite.</abstract><cop>United States</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.gca.2008.04.020</doi><tpages>15</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0016-7037 |
| ispartof | Geochimica et cosmochimica acta, 2008-07, Vol.72 (14), p.3311-3325 |
| issn | 0016-7037 1872-9533 |
| language | eng |
| recordid | cdi_osti_scitechconnect_1006716 |
| source | ScienceDirect Journals (5 years ago - present) |
| subjects | ADSORPTION BOND LENGTHS CRYSTAL STRUCTURE GEOSCIENCES HEMATITE IRON IRON OXIDES OXIDATION OXIDIZERS SORPTIVE PROPERTIES STABILITY X-RAY DIFFRACTION |
| title | Structural study of Fe(II) adsorption on hematite ( 1 1 ¯ 02 ) |
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