Abd El-Monaem Eman M, Omer Ahmed M, Khalifa Randa E, Eltaweil Abdelazeem S
Chemistry Department, Faculty of Science, Alexandria University, 21321 Alexandria, Egypt.
Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P. O. Box: 21934, Alexandria, Egypt.
J Colloid Interface Sci. 2022 Aug 15;620:333-345. doi: 10.1016/j.jcis.2022.04.010. Epub 2022 Apr 7.
Removal of pharmaceutical wastes, especially antibiotics from aquatic systems is an imperative issue from both human-health and ecological perspectives. Herein, zwitterionic UiO-66/ZIF-8 binary MOF/polydopamine@cellulose acetate composite (UiO-66/ZIF-8/PDA@CA) were fabricated in the form of floated beads for the adsorptive removal of tetracycline (TC). The formulated composite beads were characterized by FTIR, XRD, SEM, BET, Zeta potential and XPS analysis tools. Under optimum adsorption conditions, the UiO-66/ZIF-8/PDA@CA composite beads demonstrated large specific surface area, good adsorption performance with a relatively short equilibrium time (60 min) and ease separation. Furthermore, the adsorption data fit Temkin > Langmuir > Freundlich with a maximal adsorption capacity of 290.69 mg/g at 25 °C, while the adsorption kinetics were well-described by pseudo-second order kinetics. The thermodynamics studies refereed that the adsorption process was endothermic and spontaneous. Besides, the floated UiO-66/ZIF-8/PDA@CA beads displayed better adsorption property for eight reuse cycles with a maximal removal (%) reached 67%, reflecting its promising applicability as reusable adsorbent for efficient removal of antibiotics from water bodies.
从人类健康和生态角度来看，去除水生系统中的药物废物，尤其是抗生素，是一个紧迫的问题。在此，制备了两性离子UiO-66/ZIF-8二元金属有机框架/聚多巴胺@醋酸纤维素复合材料（UiO-66/ZIF-8/PDA@CA），呈漂浮珠状用于吸附去除四环素（TC）。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）、比表面积分析仪（BET）、Zeta电位和X射线光电子能谱（XPS）分析工具对制备的复合珠进行了表征。在最佳吸附条件下，UiO-66/ZIF-8/PDA@CA复合珠表现出较大的比表面积、良好的吸附性能、相对较短的平衡时间（60分钟）且易于分离。此外，吸附数据符合Temkin等温线＞Langmuir等温线＞Freundlich等温线，在25℃时最大吸附容量为290.69mg/g，而吸附动力学可用准二级动力学很好地描述。热力学研究表明吸附过程是吸热且自发的。此外，漂浮的UiO-66/ZIF-8/PDA@CA珠在八个重复使用周期中表现出较好的吸附性能，最大去除率达到67%，这反映出其作为可重复使用吸附剂从水体中高效去除抗生素的应用前景广阔。
