Fe3O4/纤维素纳米复合材料的制备及其对亚甲基蓝的吸附

采用化学沉淀法与液相复合方法联合制备磁性无机-有机Fe3O4/纤维素复合材料。采用扫描电镜及红外光谱对其进行结构表征，以亚甲基蓝溶液为模拟废水，考察了接触时间、溶液初始pH及反应温度等因素对其吸附性能的影响，分别用准一级动力学和准二级动力学方程对数据进行拟合。结果表明，温度为22℃，溶液初始pH为7.55，Fe3O4/纤维素纳米复合材料加量为0.67 g·L-1，接触时间2 h，30 mg·L-1亚甲基蓝脱色率达99.20%，准二级动力学模型能更好地描述Fe3O4/纤维素复合材料对亚甲基蓝的吸附行为。同时，Fe3O4/纤维素纳米复合材料具有较强的磁性，可通过简单的磁铁吸引作用进行分离。

Preparation of Fe3O4/cellulose Nanocomposites and its adsorption to methylene blue

An inorganic-organic Fe3O4/cellulose nanocomposite was synthesized by chemical precipitation and liquid phase methods. The resulting composite was characterized by scanning electron microscopy (SEM) and infrared spectroscopy (IR), and its adsorption performance was investigated using an aqueous solution of methylene blue (MB) dye as the simulated wastewater. The effects of contact time, initial pH, and reaction temperature on MB color removal were investigated. In addition, the kinetic data were examined in terms of the pseudo-first-order and pseudo-second-order kinetic models. In the color removal experiments, 99.20% MB color removal was achieved at 22℃, pH 7.55, and with a 2 h contact time, and an initial MB concentration of 30 mg·L-1. The adsorption data fit best with the pseudo-second-order kinetic model. Finally, a strong magnetic capacity was detected, indicating that the nanocomposite could be separated using a simple magnet.