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首页> 外文期刊>Environmental Science & Technology >Redox Properties of Plant Biomass-Derived Black Carbon (Biochar)
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Redox Properties of Plant Biomass-Derived Black Carbon (Biochar)

机译：植物生物质黑碳（生物炭）的氧化还原特性

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摘要

Soils and sediments worldwide contain appreciable amounts of thermally altered organic matter (chars). Chars contain electroactive quinoid functional groups and polycondensed aromatic sheets that were recently shown to be of biogeochemical and envirotechnical relevance. However, so far no systematic investigation of the redox properties of chars formed under different pyrolysis conditions has been performed Here, using mediated electrochemical analysis, we show that chars made from different feedstock and over a range of pyrolysis conditions are redox-active and reversibly accept and donate up to 2 mmol electrons per gram of char. The analysis of two thermosequences revealed that chars produced at intermediate to high heat treatment temperatures (HTTs) (400-700 ℃) show the highest capacities to accept and donate electrons. Combined electrochemical, elemental, and spectroscopic analyses of the thermosequence chars provide evidence that the pool of redox-active moieties is dominated by electron-donating, phenolic moieties in the low-HTT chars, by newly formed election accepting quinone moieties in intennediate-HTT chars, and by electron accepting quinones and possibly condensed aromatks in the high-HTT chars. We propose to consider chars in environmental engineering applications that require controlled electron transfer reactions. Electroactive char components may also contribute to the redox properties of traditionally defined "humic substances".
机译：全世界的土壤和沉积物都含有相当数量的热改变的有机物（炭）。炭含有电活性醌型官能团和缩聚的芳族片材，最近发现它们具有生物地球化学和环境技术的意义。但是，到目前为止，尚未对在不同热解条件下形成的焦炭的氧化还原特性进行系统的研究。在这里，使用介导的电化学分析，我们表明，由不同原料和在一定的热解条件下制成的焦炭具有氧化还原活性，并且可逆地被接受每克炭最多可贡献2 mmol电子。对两个热序列的分析表明，在中等至高温热处理温度（HTT）（400-700℃）下产生的炭表现出最高的接受和捐赠电子的能力。对热序炭进行的电化学，元素和光谱分析相结合，提供了证据，证明氧化还原活性基团由低HTT炭中的供电子酚类部分占主导地位，这是通过在强化HTT炭中新选择的接受醌部分来实现的。 ，并通过电子接受高HTT焦炭中的醌和可能缩合的芳香族化合物。我们建议在需要受控电子转移反应的环境工程应用中考虑使用炭。电活性炭组分也可能有助于传统定义的“腐殖质”的氧化还原性能。

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  • 来源
    《Environmental Science & Technology》 |2014年第10期|5601-5611|共11页
  • 作者

    Laura Kluepfel; Marco Keiluweit; Markus Kleber; Michael Sander;

  • 作者单位

    Department of Environmental Systems Science, Institute of Biogeochemistry andPollutant Dynamics, Swiss Federal Institute of Technology (ETH) Zurich, 8092 Zurich, Switzerland;

    Department of Crop and Soil Science, Oregon State University, Corvallis, Oregon 97331, United States,Department of Environmental Earth System Science, Soil and Environmental Biogeochemistry, Stanford University, Stanford,California 94305, United States;

    Department of Crop and Soil Science, Oregon State University, Corvallis, Oregon 97331, United States,Institute of Soil Landscape Research, Leibniz-Center for Agricultural Landscape Research (ZALF), 15374 Muencheberg, Germany;

    Department of Environmental Systems Science, Institute of Biogeochemistry andPollutant Dynamics, Swiss Federal Institute of Technology (ETH) Zurich, 8092 Zurich, Switzerland;

  • 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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