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首页> 外文期刊>RSC Advances >Dual application of facilely synthesized Fe3O4 nanoparticles: fast reduction of nitro compound and preparation of magnetic polyphenylthiourea nanocomposite for efficient adsorption of lead ions
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Dual application of facilely synthesized Fe3O4 nanoparticles: fast reduction of nitro compound and preparation of magnetic polyphenylthiourea nanocomposite for efficient adsorption of lead ions

机译：纯合成Fe3O4纳米粒子的双重应用：硝基化合物的快速减少，磁性多苯脲氧寡核苷酸的制备，用于有效吸附铅离子

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Herein, magnetic Fe3O4 nanoparticles were synthesized by a relatively simple and fast sono-synthetic route within 2.0 min. The prepared nanoparticles and synergic effect of NaBH4 and Na2S2O4 (1 :0.3 mole ratio) were employed as a new magnetic recyclable catalyst system for fast (2-5 s) and effective reduction of nitroaniline to phenylenediamine. The progress of the catalytic reaction was monitored with UV-vis spectroscopy and the products were extracted with CHCl3 from an ethanol-water solution. Then, silicacoated magnetic nanoparticles were reacted with carbon disulfide and 1,4-phenylenediamine, which transformed from a monomeric form to a magnetic polyphenylthiourea nanocomposite. The prepared material was characterized with FT-IR, TGA, XRD, VSM, SEM, BET, TEM and EDS techniques. According to the characterization results, an average size of 50 nm was obtained for Fe3O4 nanoparticles. The specific surface area for nanocomposite and the saturated magnetization of the naked Fe3O4 and prepared composite were 47.9 m(2) g(-1), 37.5 emu g(-1) and 21.2 emu g(-1), respectively. The polymer nanocomposite shows relatively fast adsorption kinetics towards Pb2+ ions within 3 min and good adsorption capacity equal to 250 mg g(-1). The results of an isotherm study and kinetic modelling showed that the Freundlich isotherm model and a pseudo-second order model could better describe the lead adsorption property of the composite. The prepared catalyst and composite had good stability as the reduction efficiency and recovery for trace lead adsorption remained constant after 10 and 5 cycles, respectively.
机译：在此，通过在2.0分钟内通过相对简单和快速的超声合成途径合成磁Fe3O4纳米颗粒。使用NaBH4和Na 2 S 2 O 4（1：0.3摩尔比）的制备的纳米颗粒和协同作用作为新的磁性可回收催化剂体系，用于快速（2-5秒），并有效减少苯二胺的硝基苯胺。用UV-Vis光谱监测催化反应的进展，并用CHCl 3从乙醇 - 水溶液中萃取产物。然后，硅化硅酰化纳米粒子与二硫化碳和1,4-苯二胺反应，其从单体形式转变为磁性多苯脲纳米复合材料。制备的材料用FT-IR，TGA，XRD，VSM，SEM，BET，TEM和EDS技术进行了特征。根据表征结果，对于Fe3O4纳米颗粒获得了50nm的平均尺寸。用于纳米复合材料的比表面积和裸料Fe3O4和制备的复合材料的饱和磁化分别为47.9μm（2 )g（-1），37.5mEg（-1）和21.2 emu g（-1）。聚合物纳米复合材料在3分钟内显示出朝向PB2 +离子的相对快速的吸附动力学，并且良好的吸附能量等于250mg g（-1）。等温研究和动力学建模的结果表明，Freundlich等温模型和伪二次阶模型可以更好地描述复合材料的铅吸附性能。制备的催化剂和复合材料具有良好的稳定性，因为分别在10和5次循环后痕量铅吸附的还原效率和恢复仍然存在恒定。

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