期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.2c02127
关键词
nano-biochar; mineral transformation; root exudates; LMWOAs; (hydro)quinone; electron transfer
资金
- National Natural Science Foundation of China [41977278, 41573127, 41820104009]
- Jiangsu Agricultural Science and Technology Innovation Project [CX(20)3080]
Multiple lines of evidence suggest that natural organic matter can protect poorly crystalline iron oxides from certain factors. However, nano-sized biochar has been found to promote the phase transformation of iron oxides. Moreover, it has been observed that the aggregates between nano-BC and iron minerals undergo partial dissociation during co-transport.
Multiple lines of existing evidence indicate that natural organic matter (NOM) could protect poorly crystalline Fe(III) (oxyhydr)oxides from Fe(II)-catalyzed mineral trans-formation. Conversely, we find that nano-sized biochar (nano-BC), a pyrogenic form of NOM, promotes the phase trans-formation of ferrihydrite (Fh) in nano-BC/Fh heteroaggregates in the presence of aqueous Fe(II) and rice root exudates. The nano-BC/Fh heteroaggregates are composed of a core-shell like structure where the inner-layered nano-BC is more compacted and plays the dominant role in accelerating the phase trans-formation of Fh relative to that in the outer sphere. The extent of phase transformation is more regulated by the reversible redox reactions between quinone and hydroquinone in nano-BC than the electron transfer via its condensed aromatic structures. Furthermore, the reductive organic acids in root exudates contribute to the mineral transformation of nano-BC/Fh associations by donating electrons to Fe(III) through nano-BC. Our results suggest that heteroaggregates between nano-BC and Fe minerals are subjected to partial dissociation during their co-transport, and the stably attached nano-BC is favorable to the phase transformation of poorly crystalline Fe minerals (e.g., Fh), which might have profound implications on biogeochemical cycles of carbon and Fe in the prevailing redox environments.
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