Abstract In the present work, the pyrolysis of pecan nut shell was studied using microwave technology at different input power and exposure time. The carbonaceous products were characterized using elemental analysis, potentiometric titration, thermogravimetric analysis, N2 adsorption isotherms at −196 °C and FT-IR spectroscopy. The characteristics of microwave carbonaceous products were compared with carbons prepared by conventional heating and commercial carbons and finally, the interaction of textile dyes with the carbonaceous materials was studied. The results are indicating that it is possible to obtain carbonaceous materials with similar textural parameters in conventional and microwave systems, but for microwave heating the processing times are short (3 min). Also, the exposure time of 2 min of microwave are not enough for the complete depolymerization of the lignocellulosic matrix of the pecan nut shell and significant amount of cellulose and hemicelluloses remain in char after microwave treatment. Finally, all the carbons obtained by microwave heating are microporous materials with a high number of basic groups on their surface and the high molecular size of dyes is controlling the adsorption on these materials.

中文翻译：

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山核桃果壳的微波热解和碳质产品的热重、结构和光谱表征

摘要 在目前的工作中，利用微波技术研究了不同输入功率和暴露时间下山核桃壳的热解。使用元素分析、电位滴定、热重分析、-196 °C 下的 N2 吸附等温线和 FT-IR 光谱对碳质产物进行表征。将微波碳质产品的特性与常规加热制备的碳和商业碳进行比较，最后研究了纺织染料与碳质材料的相互作用。结果表明，在常规和微波系统中可以获得具有相似结构参数的碳质材料，但微波加热的处理时间很短（3 分钟）。还，微波 2 分钟的暴露时间不足以使山核桃壳的木质纤维素基质完全解聚，微波处理后大量纤维素和半纤维素仍留在炭中。最后，通过微波加热获得的所有碳都是表面具有大量碱性基团的微孔材料，染料的高分子尺寸控制着对这些材料的吸附。