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Towards a mechanistic understanding of carbon stabilization in manganese oxides

Karen Johnson, Graham Purvis, Elisa Lopez-Capel, Caroline Peacock, Neil Gray, Thomas Wagner, Christian Marz, Leon Bowen, Jesus Ojeda Ledo Orcid Logo, Nina Finlay, Steve Robertson, Fred Worrall, Chris Greenwell

Nature Communications, Volume: 6

Swansea University Author: Jesus Ojeda Ledo Orcid Logo

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DOI (Published version): 10.1038/ncomms8628

Abstract

Minerals stabilize organic carbon (OC) in sediments, thereby directly affecting global climate at multiple scales, but how they do it is far from understood. Here we show that manganese oxide (Mn oxide) in a water treatment works filter bed traps dissolved OC as coatings build up in layers around cl...

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Published in: Nature Communications
ISSN: 2041-1723 2041-1723
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa24435
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spelling 2021-02-15T14:02:21.2463942 v2 24435 2015-11-16 Towards a mechanistic understanding of carbon stabilization in manganese oxides 4c1c9800dffa623353dff0ab1271be64 0000-0002-2046-1010 Jesus Ojeda Ledo Jesus Ojeda Ledo true false 2015-11-16 CHEG Minerals stabilize organic carbon (OC) in sediments, thereby directly affecting global climate at multiple scales, but how they do it is far from understood. Here we show that manganese oxide (Mn oxide) in a water treatment works filter bed traps dissolved OC as coatings build up in layers around clean sand grains at 3%w/wC. Using spectroscopic and thermogravimetric methods, we identify two main OC fractions. One is thermally refractory (>550 °C) and the other is thermally more labile (<550 °C). We postulate that the thermal stability of the trapped OC is due to carboxylate groups within it bonding to Mn oxide surfaces coupled with physical entrapment within the layers. We identify a significant difference in the nature of the surface-bound OC and bulk OC . We speculate that polymerization reactions may be occurring at depth within the layers. We also propose that these processes must be considered in future studies of OC in natural systems. Journal Article Nature Communications 6 2041-1723 2041-1723 21 7 2015 2015-07-21 10.1038/ncomms8628 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=MEDLINE&amp;KeyUT=MEDLINE:26194625&amp;KeyUID=MEDLINE:26194625 This work is licensed under a Creative Commons Attribution 4.0International License. The images or other third party material in thisarticle are included in the article’s Creative Commons license, unless indicated otherwisein the credit line; if the material is not included under the Creative Commons license,users will need to obtain permission from the license holder to reproduce the material.To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2021-02-15T14:02:21.2463942 2015-11-16T16:49:22.4335773 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Karen Johnson 1 Graham Purvis 2 Elisa Lopez-Capel 3 Caroline Peacock 4 Neil Gray 5 Thomas Wagner 6 Christian Marz 7 Leon Bowen 8 Jesus Ojeda Ledo 0000-0002-2046-1010 9 Nina Finlay 10 Steve Robertson 11 Fred Worrall 12 Chris Greenwell 13 0024435-15122015160001.pdf ncomms8628.pdf 2015-12-15T16:00:01.2230000 Output 1425073 application/pdf Version of Record true 2015-12-15T00:00:00.0000000 false
title Towards a mechanistic understanding of carbon stabilization in manganese oxides
spellingShingle Towards a mechanistic understanding of carbon stabilization in manganese oxides
Jesus Ojeda Ledo
title_short Towards a mechanistic understanding of carbon stabilization in manganese oxides
title_full Towards a mechanistic understanding of carbon stabilization in manganese oxides
title_fullStr Towards a mechanistic understanding of carbon stabilization in manganese oxides
title_full_unstemmed Towards a mechanistic understanding of carbon stabilization in manganese oxides
title_sort Towards a mechanistic understanding of carbon stabilization in manganese oxides
author_id_str_mv 4c1c9800dffa623353dff0ab1271be64
author_id_fullname_str_mv 4c1c9800dffa623353dff0ab1271be64_***_Jesus Ojeda Ledo
author Jesus Ojeda Ledo
author2 Karen Johnson
Graham Purvis
Elisa Lopez-Capel
Caroline Peacock
Neil Gray
Thomas Wagner
Christian Marz
Leon Bowen
Jesus Ojeda Ledo
Nina Finlay
Steve Robertson
Fred Worrall
Chris Greenwell
format Journal article
container_title Nature Communications
container_volume 6
publishDate 2015
institution Swansea University
issn 2041-1723
2041-1723
doi_str_mv 10.1038/ncomms8628
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
url http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=MEDLINE&amp;KeyUT=MEDLINE:26194625&amp;KeyUID=MEDLINE:26194625
document_store_str 1
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description Minerals stabilize organic carbon (OC) in sediments, thereby directly affecting global climate at multiple scales, but how they do it is far from understood. Here we show that manganese oxide (Mn oxide) in a water treatment works filter bed traps dissolved OC as coatings build up in layers around clean sand grains at 3%w/wC. Using spectroscopic and thermogravimetric methods, we identify two main OC fractions. One is thermally refractory (>550 °C) and the other is thermally more labile (<550 °C). We postulate that the thermal stability of the trapped OC is due to carboxylate groups within it bonding to Mn oxide surfaces coupled with physical entrapment within the layers. We identify a significant difference in the nature of the surface-bound OC and bulk OC . We speculate that polymerization reactions may be occurring at depth within the layers. We also propose that these processes must be considered in future studies of OC in natural systems.
published_date 2015-07-21T03:28:58Z
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