Novel Insights into the Impact of Nano-Biochar on Composition and Structural Transformation of Mineral/Nano-Biochar Heteroaggregates in the Presence of Root Exudates,Environmental Science & Technology

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Novel Insights into the Impact of Nano-Biochar on Composition and Structural Transformation of Mineral/Nano-Biochar Heteroaggregates in the Presence of Root Exudates
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-06-20 , DOI: 10.1021/acs.est.2c02127
Fei Lian _{1,

2} , Shiguo Gu ₂ , Yaru Han ₂ , Zhenyu Wang ₂ , Baoshan Xing ₃

Affiliation

Multiple lines of existing evidence indicate that natural organic matter (NOM) could protect poorly crystalline Fe(III) (oxyhydr)oxides from Fe(II)-catalyzed mineral transformation. Conversely, we find that nano-sized biochar (nano-BC), a pyrogenic form of NOM, promotes the phase transformation 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 transformation 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.

中文翻译：

在根系分泌物存在下纳米生物炭对矿物/纳米生物炭异聚集体的组成和结构转变的影响的新见解

多条现有证据表明，天然有机物 (NOM) 可以保护结晶度差的 Fe(III)（氢氧化物）氧化物免受 Fe(II) 催化的矿物转化。相反，我们发现纳米级生物炭 (nano-BC) 是 NOM 的一种热解形式，在 Fe(II) 水溶液和水稻根系分泌物存在的情况下，促进了 nano-BC/Fh 杂聚体中水铁矿 (Fh) 的相变。 . 纳米BC/Fh杂聚体由核壳状结构组成，其中内层纳米BC更加致密，并且在加速Fh相对于外球相的相变中起主导作用。相变的程度更多地受纳米BC中醌和氢醌之间的可逆氧化还原反应的调节，而不是通过其稠合芳族结构的电子转移。此外，根系分泌物中的还原性有机酸通过纳米 BC 向 Fe(III) 提供电子，从而有助于纳米 BC/Fh 缔合的矿物转化。我们的研究结果表明，纳米 BC 和 Fe 矿物之间的杂聚体在共运过程中会发生部分解离，稳定附着的纳米 BC 有利于结晶较差的 Fe 矿物（例如 Fh）的相变，这可能具有在普遍的氧化还原环境中对碳和铁的生物地球化学循环产生深远的影响。

更新日期：2022-06-20

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