A magnetic biosorbent was synthesized from rice straw (a biological waste) and magnetic particles of Fe3O4. The produced biosorbent, which was characterized by XRD, FE SEM, FTIR, and TGA experiments, was used for adsorption of two drug chemical components of Penicillin G and Amlodipine Besylate from aqueous solutions. Effects of various operating parameters such as adsorption temperature (10 to 70 °C), the dose of adsorbent (1 to 5 g/L), contact time (30 to 360 min), and pH of system (pH=4 to 11) on the adsorption efficiency were studied. The produced adsorbent can remove impurities with maximum adsorption efficiency of about 95% for Pen-G and 65% for AMB; therefore, it is a good adsorbent for removing pharmaceutical impurities from wastewater. Moreover, the produced biosorbent can easily separate from the solution by using an external magnetic field. Five isotherm models—linear adsorption model, Langmuir, Freundlich, Sips, and Toth—were used for describing the results; and based on Langmuir isotherm, the maximum adsorption capacity of the produced biosorbent is 164.7 mg/g for Pen-G and 229 mg/g for AMB. The adsorption kinetics was well fitted with the pseudo-first-order kinetic model, and it is shown that the adsorption is extremely in physical mode.

中文翻译：

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用于去除药物杂质的磁性生物吸附剂的生产

一种磁性生物吸附剂是由稻草（一种生物废物）和 Fe3O4 磁性颗粒合成的。制备的生物吸附剂通过XRD、FE SEM、FTIR和TGA实验表征，用于从水溶液中吸附青霉素G和苯磺酸氨氯地平两种药物化学成分。吸附温度（10～70℃）、吸附剂用量（1～5g/L）、接触时间（30～360min）、体系pH值（pH=4～11）等各种操作参数的影响对吸附效率进行了研究。生产的吸附剂可以去除杂质，最大吸附效率Pen-G约95%，AMB约65%；因此，它是去除废水中药物杂质的良好吸附剂。而且，通过使用外部磁场，产生的生物吸附剂可以很容易地从溶液中分离出来。五个等温线模型——线性吸附模型、Langmuir、Freundlich、Sips 和 Toth——用于描述结果；基于朗缪尔等温线，所生产的生物吸附剂的最大吸附容量为 Pen-G 164.7 mg/g 和 AMB 229 mg/g。吸附动力学符合准一级动力学模型，表明吸附是极端物理模式的。