Chemical characterization of rice straw-derived biochar for soil amendment
Chemical characterization of rice straw-derived biochar for soil amendment
复制标题
用于土壤改良的稻草生物炭的化学表征
DOI：
10.1016/j.biombioe.2012.09.034
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发表时间：
2012-12-01
影响因子：
6
通讯作者：
Chen, Yingxu
中科院分区：
文献类型：
--
作者：
Wu, Weixiang;Yang, Min;Chen, Yingxu
热解稻草产生用于土壤改良的生物炭似乎是解决改善土壤肥力、增加碳储存和减少温室气体排放等问题的一种有前途的方法。然而，稻草生物炭影响这些因素的能力可能因其特性而异。因此，在大规模应用稻草生物炭之前研究其特性非常有必要。在这项研究中，使用一套分析技术对在不同温度（300、400、500、600 和 700 摄氏度）和停留时间（1、2、3 和 5 小时）下生产的稻草生物炭进行了表征。结果表明，热解温度对低升温速率下稻草生物炭化学成分和结构的影响大于停留时间。特别是在400℃下生产的稻草生物炭具有高碱度和阳离子交换能力，以及高含量的有效磷和可提取阳离子。这些特性表明稻草生物炭作为肥料和土壤改良剂的潜在应用。傅里叶变换红外光谱表明较高的热解温度促进缩合反应。稻草衍生的生物炭在 400 摄氏度时含有乱层微晶，并在 500 摄氏度时表现出高水平的芳香化。提高炭化温度会增加生物炭的芳香性，并可能包括其不顺性。 (C) 2012 Elsevier Ltd. 保留所有权利。
Pyrolysis of rice straw to create biochar for soil amendment appears to be a promising method to address concerns with regard to improving soil fertility, increasing Carbon storage and decreasing Green House Gas emissions. However, the ability of rice straw-derived biochar to affect these factors might vary depending on its characteristics. It is therefore essential to investigate the properties before large-scale application of rice straw-derived biochar. In this study, rice straw-derived biochars produced at different temperatures (300, 400, 500, 600 & 700 degrees C) and residence time (1, 2, 3 & 5 h) were characterized using a suite of analytical techniques. Results showed that pyrolysis temperature had a greater influence than residence time on the chemical composition and structure of rice straw-derived biochar produced at low heating rate. The rice straw-derived biochars especially produced at 400 degrees C had high alkalinity and cation exchange capacity, and high levels of available phosphorus and extractable cations. These properties indicate potential application of rice straw-derived biochar as a fertilizer and soil amendment. Fourier transform infrared spectra showed that higher pyrolysis temperatures promote condensation reactions. Rice straw-derived biochars contained turbostratic crystallites at 400 degrees C, and displayed a high level of aromatization at 500 degrees C. Increasing charring temperature will increase the aromaticity of biochar, and might include its recalcitrance. (C) 2012 Elsevier Ltd. All rights reserved.