Higher Institute of Water Sciences and Techniques, University of Gabès, Zrig 6072, Tunisia; Laboratoire des Matériaux Composites et Matériaux Argileux, CNRSM, Technopole Borj Cedria B.P. 73, 8027, Soliman, Tunisia.
Departamento de Química Analítica, Escuela Politécnica Superior, Universidad de Sevilla. E-41011 Seville, Spain.
Chemosphere. 2023 Sep;335:139092. doi: 10.1016/j.chemosphere.2023.139092. Epub 2023 May 31.
Water contaminated by cytostatic drugs has many negative impacts on the ecosystems. In this work, cross-linked adsorbent beads based on alginate and a geopolymer (prepared from an illito-kaolinitic clay) were developed for a promising decontamination of the 5-fluorouracil (5-FU) cytostatic drug from water samples. The characterization of the prepared geopolymer and its hybrid derivative was performed by scanning electron microscopy, X-ray diffraction, Fourier transform infrared and termogravimetric analysis. Batch adsorption experiments indicated that alginate/geopolymer hybrid beads (AGHB) allow an excellent 5-FU removal efficiency of up to 80% for a dosage adsorbent/water of 0.002 g/mL and a concentration of 5-FU of 2.5 mg/L. The adsorption isotherms data follow well the Langmuir model. The kinetics data favor the pseudo-second-order model. The maximum adsorption capacity (q) was 6.2 mg/g. The optimal adsorption pH was 4. Besides pore filling sorption process, the carboxyl and hydroxyl groups from alginate immobilized onto the geopolymer matrix favored the retention of 5-FU ions by hydrogen bonds. Common competitors, such as dissolved organic matter, do not significantly affected the adsorption. In addition, this material has not only eco-friendly and cost-effective advantages but also excellent efficiency when applied to real environmental samples such as wastewater and surface water. This fact suggests that it could have a great application in the purification of contaminated water.
受细胞毒性药物污染的水会对生态系统造成许多负面影响。在这项工作中，开发了基于海藻酸钠和地质聚合物（由伊利石-高岭石粘土制备）的交联吸附珠，用于从水样中去除 5-氟尿嘧啶（5-FU）细胞毒性药物。通过扫描电子显微镜、X 射线衍射、傅里叶变换红外和热重分析对制备的地质聚合物及其杂化衍生物进行了表征。批量吸附实验表明，海藻酸钠/地质聚合物杂化珠（AGHB）在吸附剂/水的剂量为 0.002 g/mL、5-FU 浓度为 2.5 mg/L 时，可实现高达 80%的 5-FU 去除效率。吸附等温线数据很好地遵循朗缪尔模型。动力学数据有利于伪二阶模型。最大吸附容量（q）为 6.2 mg/g。最佳吸附 pH 值为 4。除了孔填充吸附过程外，固定在地质聚合物基质上的海藻酸钠的羧基和羟基通过氢键有利于 5-FU 离子的保留。常见的竞争物质，如溶解的有机物，不会显著影响吸附。此外，该材料不仅具有环保和经济高效的优势，而且在实际环境样品（如废水和地表水）中的应用效率也很高。这一事实表明，它可能在受污染水的净化方面有很大的应用。
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