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首页> 外文期刊>Environmental Science & Technology >Transformation, Morphology, and Dissolution of Silicon and Carbon in Rice Straw-Derived Biochars under Different Pyrolytic Temperatures
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Transformation, Morphology, and Dissolution of Silicon and Carbon in Rice Straw-Derived Biochars under Different Pyrolytic Temperatures

机译：不同热解温度下稻草衍生生物炭中硅和碳的转化，形态和溶解

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摘要

Biochars are increasingly recognized as environmentally friendly and cheap remediation agents for soil pollution. The roles of silicon in biochars and interactions between silicon and carbon have been neglected in the literature to date, while the transformation, morphology, and dissolution of silicon in Si-rich biochars remain largely unaddressed. In this study, Si-rich biochars derived from rice straw were prepared under 150-700 ℃ (named RS150-RS700). The transformation and morphology of carbon and silicon in biochar particles were monitored by FTIR, XRD, and SEM-EDX. With increasing pyrolytic temperature, silicon accumulated, and its speciation changed from amorphous to crystalline matter, while the organic matter evolved from aliphatic to aromatic For rice straw biomass containing amorphous carbon and amorphous silicon, dehydration (＜250 ℃) made silicic acid polymerize, resulting in a closer integration of carbon and silicon. At medium pyrolysis temperatures (250-350 ℃), an intense cracking of carbon components occurred, and, thus, the silicon located in the inside tissue was exposed. At high pyrolysis temperatures (500-700 ℃), the biochar became condensed due to the aromatization of carbon and crystallization of silicon. Correspondingly, the carbon release in water significantly decreased, while the silicon release somewhat decreased and then sharply increased with pyrolytic temperature. Along with SEM-EDX images of biochars before and after water washing, we proposed a structural relationship between carbon and silicon in biochars to explain the mutual protection between carbon and silicon under different pyrolysis temperatures, which contribute to the broader understanding of biochar chemistry and structure. The silicon dissolution kinetics suggests that high Si biochars could serve as a novel slow release source of biologically available Si in low Si agricultural soils.
机译：生物炭日益被认为是对土壤污染的环境友好且廉价的补救剂。迄今为止，硅在生物炭中的作用以及硅与碳之间的相互作用一直被忽略，而硅在富硅生物炭中的转化，形态和溶解仍未解决。在本研究中，在150-700℃下制备了稻秸秆中富含硅的生物炭（命名为RS150-RS700）。通过FTIR，XRD和SEM-EDX监测生物炭颗粒中碳和硅的转变和形态。随着热解温度的升高，硅积累，硅的形态从无定形变为晶体，有机物由脂肪族变为芳香族。对于稻草中含有无定形碳和无定形硅的生物，脱水（＜250℃）使硅酸聚合，碳和硅的紧密结合。在中等的热解温度（250-350℃）下，碳组分发生了强烈的裂解，因此，暴露了内部组织中的硅。在高温下（500-700℃），由于碳的芳构化和硅的结晶，生物炭冷凝。相应地，随着热解温度的增加，水中的碳释放量显着下降，而硅的释放量有所下降，然后急剧增加。结合水洗前后生物炭的SEM-EDX图像，我们提出了生物炭中碳与硅之间的结构关系，以解释不同热解温度下碳与硅之间的相互保护，这有助于对生物炭化学和结构的更广泛理解。 。硅的溶解动力学表明，高硅生物炭可以作为低硅农业土壤中生物有效硅的新型缓释源。

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  • 来源
    《Environmental Science & Technology》 |2014年第6期|3411-3419|共9页
  • 作者

    Xin Xiao; Baoliang Chen; Lizhong Zhu;

  • 作者单位

    Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China ,Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China;

    Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China ,Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China;

    Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China ,Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang 310058, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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