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- 2017
氨基功能化纳米Fe3O4复合材料的一步法合成及其对五氯酚的吸附与降解性能
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Abstract:
采用溶剂热一步法制备氨基功能化纳米Fe3O4 磁性复合材料（NH2-nFe3O4）。通过EA、XRD、FTIR、TEM、VSM等手段对NH2-nFe3O4进行组成、结构、形貌、磁性等表征，并研究其吸附和降解水中五氯酚（PCP）污染物的性能。结果表明：NH2-nFe3O4平均粒径约为20 nm，饱和磁化强度为56.8 emu/g；对PCP的等温吸附线符合Freundlich模型，当PCP的初始浓度为1 000 mg/L时，吸附容量（q）可达899.2 mg/g。吸附动力学研究表明，吸附过程可在5 min内达到平衡，符合准二级动力学模型；将吸附PCP后的NH2-nFe3O4加入Fe3+-H2O2体系，采用类Fenton反应可以实现PCP在可见光下原位降解。在pH值为3.0~8.0、5 min内对固载量为6.25~120.0 mg/g 的PCP实现近100%降解，较普通Fenton反应体系有更宽的pH适用范围。且NH2-nFe3O4可循环使用，是具有优异潜力的水中PCP绿色吸附与降解材料。 An amino-functionalized nano-Fe3O4 magnetic composite material (NH2-nFe3O4) was synthesized by one-pot solvothermal method. The NH2-nFe3O4 was characterized by EA, XRD, FTIR, TEM and VSM. Its application for adsorption and degradation of pentachlorophenol (PCP) was investigated. The results show that the NH2-nFe3O4 has an average size of about 20 nm, with the saturation magnetization intensity of 56.8 emu/g. The adsorption capacities were investigated by adsorbing the PCP from aqueous solutions. Thermodynamic studies suggest that the adsorption processes fit the Freundlich isotherms well. The adsorption capacity of NH2-nFe3O4 is found to be 899.2 mg/g when the initial concentration of PCP at 1000 mg/L. The adsorption kinetic studies show that the adsorption processes reach the equilibrium within 5 min and the kinetic data are well fitted to the pseudo-second-order model. The post-adsorbed material was added to Fe3+-H2O2 system. In situ degradation of PCP via Fenton-like reaction under visible light can be realized. The results indicate that at pH 3.0—8.0, the degradation of PCP with loading concentration at 6.25—120.0 mg/g can be reached to almost 100% within 5 min. NH2-nFe3O4 can be reused after regeneration. It is a potential effective and reusable material for adsorption and degradation of PCP. 浙江省自然科学基金（LY14B04003）；国家级大学生创新创业训练计划项目（201513022009）；国家自然科学基金（51608479）
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