Laboratorio de Sistemas de Separação e Otimização de Processos (LASSOP), Centro de Tecnologia, Universidade Federal de Alagoas, Maceió, AL, Brazil.
Laboratorio de Processos (LaPro), Centro de Tecnologia, Universidade Federal de Alagoas, Maceió, AL, 57072-970, Brazil.
Environ Sci Pollut Res Int. 2019 Jun;26(16):16470-16481. doi: 10.1007/s11356-019-05083-4. Epub 2019 Apr 13.
This work aims to produce activated carbon from the endocarp of Syagrus oleracea by vacuum pyrolysis and evaluate its potential as an adsorbent. The effects of pyrolysis temperature (400 °C, 500 °C, 600 °C, and 700 °C), particle diameter (0.467 mm, 0.267 mm, and lower than 0.234 mm), and activation agent (HSO, HPO, and KOH) on the potential for methylene blue adsorption were investigated. In addition, kinetics and adsorption equilibrium were evaluated. The best condition found was particle diameter < 0.234 mm, final pyrolysis temperature of 700 °C, and using KOH. Adsorption kinetics followed pseudo-second order, with equilibrium reached within 20 min. Isotherms followed the Freundlich model. Values of adsorption capacity were in the order of 30 mg/g. Thermodynamic parameters indicated that adsorption occurred spontaneously with a reduction in the heterogeneity of the solid interface/solution. The results obtained demonstrate the great adsorption capacity of the activated carbon prepared from endocarp of Syagrus oleracea via vacuum pyrolysis for the removal of up to 98% methylene blue from aqueous solutions.
本工作旨在通过真空热解从鱼尾葵的内果皮中制备活性炭，并评估其作为吸附剂的潜力。研究了热解温度（400°C、500°C、600°C 和 700°C）、粒径（0.467mm、0.267mm 和小于 0.234mm）和活化剂（HSO₄、HPO₄ 和 KOH）对亚甲基蓝吸附潜力的影响。此外，还评估了动力学和吸附平衡。发现最佳条件为粒径小于 0.234mm、最终热解温度为 700°C 且使用 KOH。吸附动力学符合拟二级动力学模型，20 分钟内达到平衡。吸附等温线符合 Freundlich 模型。吸附容量的顺序为 30mg/g。热力学参数表明，吸附是自发进行的，固-液界面的非均质性降低。结果表明，通过真空热解从鱼尾葵内果皮制备的活性炭对水溶液中亚甲基蓝的去除率高达 98%，具有很强的吸附能力。
