Abstract Activated carbons (ACs) were prepared from furfural residues (FRs) by microwave-assisted pyrolysis and activation under CO2 atmosphere in this study. At microwave activation temperature of 800 °C and activation time of 20 min, KOH impregnated ACs (MKFRAC*) reached the maximum adsorption ability. While water-washed FRs (MWFRAC*) needed higher processing temperature and longer treatment time (850 °C/60 min) to attain its maximum adsorption capacity. Raman showed MKFRAC* had a high R-value, indicating the graphite structure's low crystallinity caused by the porous structure. The iodine adsorption value, Methylene Blue (MB) number, and yield of MKFRAC* were 1159.1 mg/g, 448.0 mg/g and 26.8% wt%, respectively. The mesopore volume of MKFRAC* was >48%, more than those of other ACs mainly due to the synergistic effect of chemical reagents, carbon structure and microwave irradiation. The investigation on the adsorption mechanism of MB on ACs revealed that MB adsorption capacities of MKFRAC were well described by the Langmuir model, showing a maximum monolayer adsorption capacity of 562.9 mg/g, while MB adsorption kinetics of MKFRAC followed a pseudo-second-order model. The results showed microwave preparation of FR-based ACs was a feasible technique with potential industrial applications.

中文翻译：

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糠醛残渣微波辅助热解活化制备活性炭的表征与分析

摘要 本研究以糠醛残渣 (FRs) 为原料，在 CO2 气氛下通过微波辅助热解和活化制备活性炭 (ACs)。在 800°C 的微波活化温度和 20 分钟的活化时间下，KOH 浸渍的活性炭（MKFRAC*）达到最大吸附能力。而水洗阻燃剂 (MWFRAC*) 需要更高的处理温度和更长的处理时间（850 °C/60 分钟）才能达到其最大吸附容量。拉曼光谱显示 MKFRAC* 具有高 R 值，表明多孔结构导致石墨结构的低结晶度。MKFRAC* 的碘吸附值、亚甲蓝 (MB) 值和产率分别为 1159.1 mg/g、448.0 mg/g 和 26.8% wt%。MKFRAC* 的介孔体积 >48%，高于其他 ACs，主要是由于化学试剂的协同作用，碳结构和微波辐射。MB在活性炭上的吸附机理研究表明，Langmuir模型很好地描述了MKFRAC对MB的吸附容量，显示最大单层吸附容量为562.9 mg/g，而MKFRAC的MB吸附动力学遵循伪二级模型。结果表明，微波制备基于阻燃剂的活性炭是一种具有潜在工业应用的可行技术。