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• W2078238238 endingPage "9112" @default.
• W2078238238 startingPage "9103" @default.
• W2078238238 abstract "Few studies have investigated the effects of structural heterogeneity (particularly the interactions of silicon and carbon) on the mechanisms for the recalcitrance of biochar. In this study, the molecular mechanisms for the recalcitrance of biochars derived from rice straw at 300, 500, and 700 °C (named RS300, RS500, and RS700, respectively) were elucidated. Short-term (24 h) and long-term (240 h) oxidation kinetics experiments were conducted under different concentrations of H2O2 to distinguish the stable carbon pools in the biochars. We discovered that the stabilities of the biochars were influenced not only by their aromaticity but also through possible protection by silicon encapsulation, which is regulated by pyrolysis temperatures. The aromatic components and recalcitrance of the biochars increased with increasing pyrolysis temperatures. The morphologies of the carbon forms in all of the biochars were also greatly associated with those of silica. Silica-encapsulation protection only occurred for RS500, not for RS300 and RS700. In RS300, carbon and silica were both amorphous, and they were easily decomposed by H2O2. The separation of crystalline silica from condensed aromatic carbon in RS700 eliminated the protective role of silicon on carbon. The effect of the biochar particle size on the stability of the biochar was greatly influenced by C–Si interactions and by the oxidation intensities. A novel silicon-and-carbon-coupled framework model was proposed to guide biochar carbon sequestration." @default.
• W2078238238 created "2016-06-24" @default.
• W2078238238 creator A5001762315 @default.
• W2078238238 creator A5090741037 @default.
• W2078238238 date "2014-07-24" @default.
• W2078238238 modified "2023-10-15" @default.
• W2078238238 title "Insights on the Molecular Mechanism for the Recalcitrance of Biochars: Interactive Effects of Carbon and Silicon Components" @default.
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• W2078238238 doi "https://doi.org/10.1021/es405647e" @default.
• W2078238238 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25017808" @default.
• W2078238238 hasPublicationYear "2014" @default.
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