Journal article 1631 views 308 downloads
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 
,
Nina Finlay,
Steve Robertson,
Fred Worrall,
Chris Greenwell
,
Nina Finlay,
Steve Robertson,
Fred Worrall,
Chris Greenwell
Nature Communications, Volume: 6
Swansea University Author:
Jesus Ojeda Ledo
-
PDF | Version of Record
Download (1.33MB)
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...
| Published in: | Nature Communications |
|---|---|
| ISSN: | 2041-1723 2041-1723 |
| Published: |
2015
|
| Online Access: |
Check full text
|
| URI: | https://cronfa.swan.ac.uk/Record/cronfa24435 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| 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 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. |
|---|---|
| Item Description: |
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: |
Faculty of Science and Engineering |