Laboratório de Processos (LaPro), Centro de Tecnologia, Universidade Federal de Alagoas, Maceió, AL, Brazil.
Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli Federico II, P.leTecchio, 80, 80125 Napoli, Italy.
Colloids Surf B Biointerfaces. 2020 Nov;195:111230. doi: 10.1016/j.colsurfb.2020.111230. Epub 2020 Jun 30.
Waste of Mytella falcata shell was used as low-cost adsorbent to remove the biocide Basic Green 4 (BG4) from water. Shells were collected form trash nearby the lagoon were Mytella falcata is fished. After clean, dry and crushed, the powder was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and X-ray dispersive energy spectroscopy (EDS). Both kinetic and equilibrium adsorption tests are carried out. Adsorbent regenerability was tested during adsorption/desorption cycles, using a UV photo-regeneration process. The maximum adsorption capacity reached 539.24 mg.g-1 (60 °C), which was higher than those retrieved for other materials with similar origin. The kinetic results indicated that the process followed pseudo-second order model. Equilibrium data indicate an increase in BG4 adsorption capacity with temperature and Sips model had better fit for all the investigated temperatures (30, 40, 50 and 60 °C). The regeneration/reuse test indicated that the adsorbent is able to assure a BG4 removal above 70 % during five adsorption/desorption cycles evaluated. Thermodynamic parameters suggested that adsorption is spontaneous, endothermal, governed by chemisorption and with structural changes in the solid surface upon adsorption.
废弃的贻贝贝壳被用作低成本吸附剂，从水中去除杀生剂碱性绿 4（BG4）。贝壳是从贻贝捕捞的泻湖附近的垃圾中收集的。清洁、干燥和粉碎后，用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、X 射线粉末衍射（XRD）和 X 射线能谱（EDS）对粉末进行了表征。进行了动力学和平衡吸附试验。在吸附/解吸循环中，使用 UV 光再生过程测试了吸附剂的可再生性。最大吸附容量达到 539.24mg.g-1（60°C），高于用类似来源的其他材料获得的吸附容量。动力学结果表明，该过程遵循准二级模型。平衡数据表明，BG4 吸附容量随温度升高而增加，Sips 模型对所有研究温度（30、40、50 和 60°C）都有更好的拟合。再生/再利用试验表明，在评估的五个吸附/解吸循环中，吸附剂能够保证 BG4 的去除率高于 70%。热力学参数表明，吸附是自发的、吸热的，由化学吸附控制，并且在吸附过程中固体表面发生结构变化。
