Laboratório de Processos (LaPro), Centro de Tecnologia (CTEC), Universidade Federal de Alagoas (UFAL), Maceió, AL, Brasil.
Laboratório de Eletroquímica Aplicada (LEAP), Instituto de Química e Biotecnologia (IQB), Universidade Federal de Alagoas, Maceió, AL, Brasil.
Environ Sci Pollut Res Int. 2019 Nov;26(31):31804-31811. doi: 10.1007/s11356-019-06288-3. Epub 2019 Sep 5.
In the present work, the composite MgAl-LDH/biochar using activated carbon from bovine bone as support for the layered double hydroxide particles was successfully synthesised and used as an alternative adsorbent for caffeine removal from water. Kinetic studies showed that the equilibrium was achieved in only 20 min of contact between the adsorbent and the adsorbate. The pseudo-first-order model represented the experimental data more satisfactorily (R = 0.95), suggesting a physical adsorption process. The isotherms were performed at three temperatures, in which it was observed the decrease in the adsorption in higher temperatures. It was obtained a maximum adsorption capacity of 26.219 mg/g at 40 °C, and the experimental data were better adjusted by Redlich-Peterson, R > 0.9942. In short, the study demonstrated that the composite was satisfactorily synthesised and its use in the caffeine removal was quite attractive, being a potential adsorbent for water treatment applications.
在本工作中，成功合成了以牛骨活性炭为载体的复合 MgAl-LDH/生物炭，并将其用作从水中去除咖啡因的替代吸附剂。动力学研究表明，吸附剂与吸附质在接触 20 min 内即可达到平衡。准一级模型更能很好地描述实验数据（R = 0.95），表明这是一个物理吸附过程。在三个温度下进行了等温线实验，观察到在较高温度下吸附量下降。在 40°C 时，获得了 26.219 mg/g 的最大吸附容量，实验数据通过 Redlich-Peterson 模型得到了更好的拟合，R > 0.9942。总之，该研究表明，成功合成了复合材料，其在咖啡因去除方面的应用具有吸引力，是一种有潜力的水处理应用吸附剂。
