Abstract

In recent decades, the need for producing adsorbents with high absorption capacity and easy separation has led to preparation of magnetic absorbents. In this study, green synthesis of iron oxide/cellulose nanocomposite was used to remove metronidazole from aquatic solutions by application of aqueous extract of spent tea waste regarding its effective and magnetic separation capability. The properties of the synthesized nanocomposite was determined by several advanced techniques, including, X-ray spectroscopy, electron microscopy imaging, thermal analysis and magnetometry. The capability of the nanocomposite adsorption in removal of metronidazole from aqueous solution was evaluated by optimizing four important parameters (pH, initial concentration of metronidazole, amount of nanocomposite and contact time). Different equilibrium isotherms and kinetic models were tested to determine the mechanism and kinetics of adsorption. X-ray diffraction patterns and electron microscopic images showed that the prepared nanocomposite had spherical particles with an average size of at least 15.5 nm. pH of 5, concentration of 10 mg/L of metronidazole, nanocomposite amount of 25 mg/L and time of 30 min were determined to form the optimal operating conditions, with the removal efficiency of 97.04%. The best model for fitting the experimental data were Langmuir isotherm with a maximum adsorption capacity of 332 mg/g and pseudo-first-order kinetic model with a constant rate of 1.15 L/min and a correlation coefficient of 0.97. The prepared nanocomposite was proposed to be studied in drug delivery systems for its high adsorption capacity, suitable magnetic properties and environmental application.

中文翻译：

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绿色合成的Fe 3 O 4 /纤维素纳米复合材料，适合去除甲硝唑

摘要

近几十年来，对生产具有高吸收能力和易于分离的吸附剂的需求导致了磁性吸收剂的制备。在这项研究中，氧化铁/纤维素纳米复合材料的绿色合成通过应用废茶渣的水提物，从其水溶液和溶液中去除甲硝唑，有关其有效和磁分离能力。合成的纳米复合材料的性能是通过几种先进的技术确定的，包括X射线光谱，电子显微镜成像，热分析和磁力分析。通过优化四个重要参数（pH，甲硝唑的初始浓度，纳米复合物的量和接触时间），评估了纳米复合材料吸附从水溶液中去除甲硝唑的能力。测试了不同的平衡等温线和动力学模型，以确定吸附的机理和动力学。X射线衍射图和电子显微镜图像表明，所制备的纳米复合材料具有平均尺寸至少为15.5nm的球形颗粒。确定pH为5，浓度为10 mg / L的甲硝唑，纳米复合物的量为25 mg / L和时间为30分钟以形成最佳操作条件，去除效率为97.04％。拟合实验数据的最佳模型是最大吸附量为332 mg / g的Langmuir等温线和恒定速率为1.15 L / min和相关系数为0.97的拟一级动力学模型。拟议制备的纳米复合材料因其高吸附能力而在药物输送系统中进行研究，