Applied Thermodynamic Research Unit UR11ES80, National Engineering School of Gabes, University of Gabes, Avenue Omar Ibn El Khattab, 6029, Gabes, Tunisia.
Department of Chemical and Environmental Engineering, University of Oviedo, C/ Julián Clavería s/n, E-33071, Oviedo, Spain.
Environ Sci Pollut Res Int. 2020 Jul;27(19):23447-23463. doi: 10.1007/s11356-018-3812-2. Epub 2019 Jan 3.
In this study, novel cellulose-bead-based biosorbents (CBBAS) were successfully synthesized from almond shell using a simple three-step process: (i) dissolution of bleached almond shell in ionic liquid (1-butyl-3-methylimidazolium chloride), (ii) coagulation of cellulose-ionic liquid solution in water and (iii) freeze-drying. Their morphological, structural and physicochemical properties were thoroughly characterized. These biomaterials exhibited a 3D-macroporous structure with interconnected pores, which provided a high number of adsorption sites. It should be noted that CBBAS biosorbents were efficiently employed for the removal of copper (II) ions from aqueous solutions, showing high adsorption capacity: 128.24 mg g. The biosorption equilibrium data obtained were successfully fitted to the Sips model and the kinetics were suitably described by the pseudo-second-order model. Besides, CBBAS biosorbents can be easily separated from the solution for their subsequent reuse, and thus, they represent a method for the removal of copper (II) from aqueous solutions that is not only eco-friendly but also economical.
在这项研究中，成功地从杏仁壳中合成了新型纤维素珠基生物吸附剂 (CBBAS)，采用了简单的三步法：(i) 在离子液体（1-丁基-3-甲基咪唑氯化物）中溶解漂白杏仁壳，(ii) 将纤维素-离子液体溶液在水中凝结，(iii) 冷冻干燥。对它们的形态、结构和物理化学性质进行了彻底的表征。这些生物材料具有 3D 大孔结构，具有相互连接的孔，提供了大量的吸附位点。值得注意的是，CBBAS 生物吸附剂可有效地用于从水溶液中去除铜 (II) 离子，表现出高吸附容量：128.24 mg g。获得的生物吸附平衡数据成功地拟合到 Sips 模型，动力学则适合用伪二阶模型来描述。此外，CBBAS 生物吸附剂可以很容易地从溶液中分离出来，以便随后重复使用，因此，它们代表了一种从水溶液中去除铜 (II) 的方法，不仅环保而且经济。
