LAQV-REQUIMTE/Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal; Departamento de Procesos Químicos, Facultad de Ciencias Matemáticas, Físicas y Químicas, Universidad Técnica de Manabí, Portoviejo, Ecuador; Laboratorio de Análisis Químicos y Biotecnológicos, Instituto de Investigación, Universidad Técnica de Manabí, Portoviejo, Ecuador.
Departamento de Procesos Químicos, Facultad de Ciencias Matemáticas, Físicas y Químicas, Universidad Técnica de Manabí, Portoviejo, Ecuador.
Bioresour Technol. 2024 Mar;396:130453. doi: 10.1016/j.biortech.2024.130453. Epub 2024 Feb 14.
In this study, a hybrid material, MIL-53(Al)@CBS, was synthesized via the solvothermal method, involving the growth of MIL-53(Al) crystals on cocoa bean shell residues (CBS). Physicochemical characterization techniques, including TGA, BET, FTIR, XRD, and SEM, confirmed successful hybridization. MIL-53(Al)@CBS was employed as an adsorbent for antibiotics (oxytetracycline, tetracycline, chlortetracycline) separation from aqueous solutions. Parameters like pH, adsorbent dose, concentration, time, and temperature were systematically evaluated. FTIR revealed π-π interactions and hydrogen bonds between tetracyclines and the adsorbent. MIL-53(Al)@CBS exhibited adsorption, with removal rates up to 98.92%, 99.04%, and 98.24% for OTC, TC, and CTC, respectively. Kinetics suggested adsorption depends on active site availability, with TC adsorbing fastest. Microscopic models showed adsorption on three distinct active site types with different affinities without competition or adherence to the Langmuir hypothesis. Importantly, MIL-53(Al)@CBS maintained high adsorption capacity even after ten washing cycles, highlighting its potential for water treatment.
在这项研究中，通过溶剂热法合成了一种混合材料 MIL-53(Al)@CBS，其中包括在可可豆壳残渣 (CBS) 上生长 MIL-53(Al) 晶体。TGA、BET、FTIR、XRD 和 SEM 等物理化学特性分析技术证实了成功的杂交。MIL-53(Al)@CBS 被用作从水溶液中分离抗生素（土霉素、四环素、金霉素）的吸附剂。系统地评估了 pH 值、吸附剂剂量、浓度、时间和温度等参数。FTIR 揭示了四环素与吸附剂之间的π-π 相互作用和氢键。MIL-53(Al)@CBS 表现出吸附作用，对 OTC、TC 和 CTC 的去除率分别高达 98.92%、99.04%和 98.24%。动力学表明吸附取决于活性位点的可用性，TC 的吸附速度最快。微观模型表明，吸附作用发生在三种不同的具有不同亲和力的活性位点上，不存在竞争或符合朗缪尔假设。重要的是，MIL-53(Al)@CBS 即使在经过十次洗涤循环后仍保持高吸附能力，这突出了其在水处理中的应用潜力。
