da Costa Matheus Londero, Pavoski Giovani, Espinosa Denise Crocce Romano, de Vasconcellos Noeli Júlia Schüssler, da Silva William Leonardo
Chemical Engineering Course, Franciscan University, Santa Maria, Brazil.
Polytechnical School of Chemical Engineering, University of São Paulo, São Paulo, SP Brazil.
Water Air Soil Pollut. 2022;233(2):65. doi: 10.1007/s11270-022-05528-6. Epub 2022 Feb 12.
The work aims to synthesize and characterize vegetal charcoal (or biochar) from Syzygium cumini (AC-SC), evaluating the adsorption capacity for dexamethasone drug (DEX) removal, using the kinetic and equilibrium adsorption. The samples were characterized by N porosimetry, X-ray diffraction, scanning electron microscopy with energy-dispersive spectroscopy, zeta potential, and zero charge point. Adsorption equilibrium was carried out applying the Langmuir, Freundlich, Redlich-Peterson, Sips, and Toth models, and kinetic adsorption applied the pseudo-first order, pseudo-second order, Elovich, Avrami, and Weber-Morris models. AC-SC showed a heterogeneous and porous surface, negatively charged, crystalline structure, specific surface area of the 2.14 m g and pH = 7.36. About the effect of the AC-SC concentration, 5.0 g L showed the best DEX removal (53.02%), about the others' concentration (2.0 and 7.5 g L). About the equilibrium and kinetic adsorption, the Sips model and pseudo-second order showed the best experimental data adjusted, indicating that the adsorption monolayer was dependent on the ions onto the biosorbent, with a maximum adsorption capacity of 0.744 mg g after 180 min. Therefore, AC-SC can be used as an alternative material in the removal of organic pollutants, such as drug removal.
这项工作旨在合成并表征来自蒲桃（AC-SC）的植物炭（或生物炭），通过动力学和平衡吸附评估其对去除地塞米松药物（DEX）的吸附能力。通过N孔隙率测定法、X射线衍射、带能谱的扫描电子显微镜、zeta电位和零电荷点对样品进行表征。应用朗缪尔、弗伦德利希、雷德利希-彼得森、西普斯和托特模型进行吸附平衡研究，应用准一级、准二级、埃洛维奇、阿夫拉米和韦伯-莫里斯模型进行动力学吸附研究。AC-SC呈现出异质且多孔的表面，带负电荷，具有晶体结构，比表面积为2.14 m²/g，pH值为7.36。关于AC-SC浓度的影响，5.0 g/L表现出最佳的DEX去除率（53.02%），优于其他浓度（2.0和7.5 g/L）。关于平衡吸附和动力学吸附方面，西普斯模型和准二级模型显示出最佳拟合实验数据，表明吸附单层依赖于生物吸附剂上的离子，180分钟后最大吸附容量为0.744 mg/g。因此，AC-SC可作为去除有机污染物（如药物去除）的替代材料使用。
