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The Interfacial Behavior between Biochar and Soil Minerals and Its Effect on Biochar Stability

Yang, Fan, Zhao, Ling, Gao, Bin, Xu, Xiaoyun, Cao, Xinde·2016·Environmental Science & Technology

Abstract

In this study, FeCl3, AlCl3, CaCl2, and kaolinite were selected as model soil minerals and incubated with walnut shell derived biochar for 3 months and the incubated biochar was then separated for the investigation of biochar-mineral interfacial behavior using XRD and SEM-EDS. The XPS, TGA, and H2O2 oxidation were applied to evaluate effects of the interaction on the stability of biochar. Fe8O8(OH)8Cl1.35 and AlCl3·6H2O were newly formed on the biochar surface or inside of the biochar pores. At the biochar-mineral interface, organometallic complexes such as Fe-O-C were generated. All the 4 minerals enhanced the oxidation resistance of biochar surface by decreasing the relative contents of C-O, C═O, and COOH from 36.3% to 16.6-26.5%. Oxidation resistance of entire biochar particles was greatly increased with C losses in H2O2 oxidation decreasing by 13.4-79.6%, and the C recalcitrance index (R50,bicohar) in TGA analysis increasing from 44.6% to 45.9-49.6%. Enhanced oxidation resistance of biochar surface was likely due to the physical isolation from newly formed minerals, while organometallic complex formation was probably responsible for the increase in oxidation resistance of entire biochar particles. Results indicated that mineral-rich soils seemed to be a beneficial environment for biochar since soil minerals could increase biochar stability, which displays an important environmental significance of biochar for long-term carbon sequestration.

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Crossref · 10.1021/acs.est.5b03656

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Metadata

Authors
Yang, F., Zhao, L., Gao, B., Xu, X., & Cao, X.
Venue
Environmental Science & Technology
Published
2016-02-18
Volume
50
Issue
5
Pages
2264-2271
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2256602519
Cited by
397
References
7
FWCI
37.66
Type
journal article
Language
en
Open access
closed

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