Nunes Franciane Batista, da Silva Bruckmann Franciele, da Rosa Salles Theodoro, Rhoden Cristiano Rodrigo Bohn
Laboratório de Materiais Magnéticos Nanoestruturados, LaMMaN, Universidade Franciscana - UFN, Santa Maria-RS, Brazil.
Programa de Pós-Graduação Em Nanociências, Universidade Franciscana - UFN, Santa Maria-RS, Brazil.
Environ Sci Pollut Res Int. 2023 Jan;30(5):12658-12671. doi: 10.1007/s11356-022-23075-9. Epub 2022 Sep 17.
Due to its wide use in anticonvulsant pharmacotherapy, phenobarbital (PHEN) is an aquatic contaminant with a high prevalence in the environment. In this adsorption study, chitosan and chitosan-based magnetic adsorbents containing different amounts of incorporated magnetite (CS, CS·FeO 1:1, CS·FeO 1:5, and CS·FeO 1:10) were used for phenobarbital removal. The magnetic adsorbents were synthesized by co-precipitation method and characterized through FTIR, XRD, MEV, and VSM analysis. In PHEN adsorption, the equilibrium and adsorption kinetic were better adjusted by the Sips and pseudo-second-order model, respectively. Among the four nanoadsorbents used, the maximum phenobarbital adsorption capacity was 94.60 mg g using 25 mg of CS·FeO 1:5, with a concentration of PHEN (50 mg L), pH 7.0 at room temperature. The parameters of pH, adsorbent dosage, ionic strength, and thermodynamic study were tested for the adsorbent with the highest performance (CS·FeO 1:5). The nanoadsorbent demonstrates efficiency in the removal of the contaminant for diverse adsorption cycles. Finally, the protocol employing magnetic adsorbents dispenses the subsequent steps of filtration and centrifugation.
由于苯巴比妥（PHEN）在抗惊厥药物治疗中广泛应用，它成为一种在环境中普遍存在的水生污染物。在这项吸附研究中，壳聚糖以及含有不同含量磁铁矿的壳聚糖基磁性吸附剂（CS、CS·FeO 1:1、CS·FeO 1:5和CS·FeO 1:10）被用于去除苯巴比妥。磁性吸附剂通过共沉淀法合成，并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（MEV）和振动样品磁强计（VSM）分析进行表征。在苯巴比妥吸附过程中，Sips模型和准二级模型分别能更好地拟合平衡吸附和吸附动力学。在所使用的四种纳米吸附剂中，在室温下，使用25 mg的CS·FeO 1:5，苯巴比妥浓度为50 mg/L、pH为7.0时，最大吸附容量为94.60 mg/g。对性能最佳的吸附剂（CS·FeO 1:5）测试了pH、吸附剂用量、离子强度和热力学研究等参数。该纳米吸附剂在不同吸附循环中都表现出去除污染物的高效性。最后，采用磁性吸附剂的方案无需后续过滤和离心步骤。
