2026-09-21T13:45:28Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/105146 2023-07-11 col_2142_5131 col_2142_14737 com_2142_5130 com_2142_690 com_2142_397

Arai, Yuji Chen, Ai 2019-08-23T20:44:35Z 2019-08-23T20:44:35Z 2021-08-24T09:15:10Z 2019-03-25 2019-05 Phytic acid is the most predominant organic phosphorus species in soils. Its stability in soils is mainly due to its high affinity for soil colloids, especially Fe (oxyhydr)oxides. They have been acknowledged as mobile/reactive adsorbents for P in soil-water environments. Although several sorption mechanisms were proposed, it is not clear how multi phosphate groups of phytic acid contribute to the surface complexation and/or precipitation processes. In this study, sorption behavior of phytic acid in ferrihydrite was examined using experimental geochemistry, solution 31P nuclear magnetic resonance spectroscopy, X-ray diffraction and scanning electron microscopy. The results indicated inner-sphere surface complexation via P1,3 and P2 functional groups under both pH 5 and 8.5. Under alkaline pH, an additional P5 functional group became active. Coprecipitation experiments showed evidence of the formation of Fe(III)-phytate-like bulk precipitates when the initial phytic acid/Fe(III) molar ratio was high (0.45-0.5). At the low phytic acid/Fe(III) (<0.1), the formation of ferrihydrite was unaffected, but further transformation was still inhibited. The study suggests a new role of phytic acid in the formation of Fe oxyhydroxide minerals. Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-05-01 The student, Ai Chen, accepted the attached license on 2019-03-22 at 09:27. The student, Ai Chen, submitted this Thesis for approval on 2019-03-22 at 09:39. This Thesis was approved for publication on 2019-03-25 at 10:06. DSpace SAF Submission Ingestion Package generated from Vireo submission #13441 on 2019-08-22 at 16:20:26 Made available in DSpace on 2019-08-23T20:44:35Z (GMT). No. of bitstreams: 2 CHEN-THESIS-2019.pdf: 1920983 bytes, checksum: 29cd594d8d0011039bf498f5ec805648 (MD5) LICENSE.txt: 4204 bytes, checksum: 2acc9ddd552dbf2984db2bbd626e9a2b (MD5) Previous issue date: 2019-03-25 Embargo set by: Seth Robbins for item 112265 Lift date: 2021-08-23T20:44:50Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 112265 Lift date: 2021-08-23T20:46:41Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 112265 Lift date: 2021-08-23T20:47:38Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Embargo set by: Seth Robbins for item 112265 Lift date: 2021-08-23T20:48:32Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system Limited Restriction Lifted for Item 112265 on 2021-08-24T09:15:10Z. application/pdf http://hdl.handle.net/2142/105146 en Copyright 2019 Ai Chen phytic acid sorption ferrihydrite NMR XRD SEM Effects of phytic acid sorption on iron polymerization and at the ferrihydrite-water interface text text Natural Res & Env Sci Natural Res & Env Sciences University of Illinois at Urbana-Champaign Thesis M.S.