Efficient and low-cost production of activated carbon (AC) is a challenge due to environmental and economic concerns. The combination of microwave pyrolysis and the use of lignocellulosic waste is a promising alternative to reduce the AC production costs in a sustainable way. In the present study, the adaptation performed in a domestic microwave oven is described, with no radiation leak, being a safe, simple, and fast method for AC production. Activated carbon samples from coffee grounds (CG), olive stones (OS), and Kraft lignin (KL) were produced by chemical activation (H₃PO₄ as activating agent), resulting in surface areas of 550, 1125, and 1170 m²g⁻¹ and yields of 19, 21, and 23%, respectively. Phosphoric acid favored the microwave absorption by the lignocellulosic material (CG, OS, and KL), making the AC production viable for all tested raw materials. This result was confirmed by FTIR and XRD analyses, showing, respectively, the reduction of functional groups and the presence of characteristic carbon bands at 24° and 44° in the treated samples. Scanning electron microscopy analyses confirmed that the morphology of ACs is strongly influenced by the nature of the precursors. The maximum adsorption capacity of methylene blue dye (MB) was of 80, 90, and 85 mgg⁻¹, i.e., 82, 95, and 92% for the ACCG, ACOS, and ACKL samples, respectively. The obtained results allow concluding that the microwave-assisted pyrolysis is a process with great potential for rapid and low-cost AC production.

由于环境和经济问题，活性炭 (AC) 的高效和低成本生产是一项挑战。微波热解和使用木质纤维素废物的结合是一种有前途的替代方案，可以以可持续的方式降低 AC 生产成本。在本研究中，描述了在家用微波炉中进行的适应，没有辐射泄漏，是一种安全、简单、快速的交流生产方法。来自咖啡渣 (CG)、橄榄石 (OS) 和牛皮纸木质素 (KL) 的活性炭样品通过化学活化（H ₃ PO ₄作为活化剂）产生，表面积分别为 550、1125 和 1170 m ² g ^-1产率分别为 19%、21% 和 23%。磷酸有利于木质纤维素材料（CG、OS 和 KL）的微波吸收，使 AC 生产适用于所有测试的原材料。该结果通过 FTIR 和 XRD 分析得到证实，分别显示处理样品中官能团的减少和 24° 和 44° 处的特征碳带的存在。扫描电子显微镜分析证实，ACs 的形态受到前体性质的强烈影响。亚甲蓝染料 (MB) 的最大吸附量分别为 80、90 和 85 mgg ^-1，即 ACCG、ACOS 和 ACKL 样本分别为 82、95 和 92%。获得的结果可以得出结论，微波辅助热解是一种具有快速和低成本生产交流电的巨大潜力的过程。