| 四氧化三铁/聚乙烯亚胺纳米颗粒的制备及除磷性能的研究 |
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| 引用本文： | 胡小莲,唐婉莹,何世颖,杨林章,张婉,修瑞瑞.四氧化三铁/聚乙烯亚胺纳米颗粒的制备及除磷性能的研究[J].环境科学学报,2017,37(11):4129-4138. |
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| 作者姓名： | 胡小莲 唐婉莹 何世颖 杨林章 张婉 修瑞瑞 |
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| 作者单位： | 1. 南京理工大学化工学院, 南京 210094;2. 江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014,南京理工大学化工学院, 南京 210094,江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014,江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014,南京理工大学化工学院, 南京 210094,江苏省农业科学院农业资源与环境研究所, 农业部长江下游平原农业环境重点实验室, 南京 210014 |
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| 基金项目： | 农业部公益性行业（农业）科研专项（No.20150306）；江苏省农业自主创新资金项目（No.CX（15）5004） |
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| 摘 要： | 采用化学共沉淀法,以聚乙烯亚胺(PEI)为改性剂,制备了聚乙烯亚胺改性的纳米四氧化三铁复合材料(Fe3O4/PEI).Zeta电位、透射电镜和FTIR表征结果显示,PEI修饰提高了纳米Fe3O4在水中的分散性和稳定性,同时也增强了其表面正电荷,从而提高了Fe3O4对水中磷酸根的去除能力.在磷酸根初始浓度为50 mg·L~(-1),Fe3O4/PEI投加量为200 mg,p H=3,温度为25℃的条件下,Fe3O4/PEI对100 m L磷酸根的吸附去除率达到91%.吸附过程在3 h内达到平衡.吸附等温数据表明,该吸附过程符合Langmuir吸附等温方程,可决系数R2达到0.99,最大吸附量为29.88 mg·L~(-1).Fe3O4/PEI复合材料重复利用性好,在第5次吸附-解析后还能保持对磷酸根75%以上的吸附去除率.磷的解析效率随着p H增加而增加,在p H=13时,解析效率达到65%.
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| 关 键 词： | Fe3O4 PEI改性 Fe3O4/PEI 磷 吸附效率 吸附机制 |
| 收稿时间： | 2017/3/20 0:00:00 |
| 修稿时间： | 2017/6/8 0:00:00 |
Preparation of Fe3O4/polyethyleneimine and its application for phosphate adsorption |
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| HU Xiaolian,TANG Wanying,HE Shiying,YANG Linzhang,ZHANG Wan and XIU Ruirui.Preparation of Fe3O4/polyethyleneimine and its application for phosphate adsorption[J].Acta Scientiae Circumstantiae,2017,37(11):4129-4138. |
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| Authors: | HU Xiaolian TANG Wanying HE Shiying YANG Linzhang ZHANG Wan and XIU Ruirui |
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| Institution: | 1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094;2. Institute of Agricultural Science and Environment, Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downsteam of Yangtze Plain, Ministry of Agriculture, Nanjing 210014,School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094,Institute of Agricultural Science and Environment, Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downsteam of Yangtze Plain, Ministry of Agriculture, Nanjing 210014,Institute of Agricultural Science and Environment, Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downsteam of Yangtze Plain, Ministry of Agriculture, Nanjing 210014,School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094 and Institute of Agricultural Science and Environment, Jiangsu Academy of Agricultural Sciences, Key Lab of Agri-environment in Downsteam of Yangtze Plain, Ministry of Agriculture, Nanjing 210014 |
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| Abstract: | In this study, magnetite (Fe3O4) modified with polyethyleneimine (PEI) was synthesized by chemical coprecipitation method. This magnetic composite (Fe3O4/PEI) was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and Zeta potential. Furthermore, the adsorption-desorption process and mechanisms of Fe3O4/PEI towards phosphate were investigated in aqueous solutions. Results indicated that adsorption efficiency of phosphate by Fe3O4/PEI reached 91%, which was higher than that of Fe3O4,under the condition of 50 mg·L-1 of initial phosphate concentration, 200 mg Fe3O4/PEI, and pH 3 at room temperature, the desorption efficiency reached 65% at pH 13. Polyethyleneimine not only improved the dispersibility of Fe3O4, but also increased the positive charge on the surface of Fe3O4. The phosphate adsorption behavior by Fe3O4/PEI was in good agreement with the Langmuir adsorption model. Adsorption kinetic study showed that the equilibrium was reached in 3 hours, and the adsorption process is well fit by pseudo-second-order kinetic model. Phosphate was adsorbed to the Fe3O4/PEI surface via electrostatic attraction and ligand exchange. In conclusion, our investigation indicates that Fe3O4/PEI is a type of stable and highly efficient material for adsorption of phosphate. |
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| Keywords: | Fe3O4 nanoparticle polyethyleneimine modification Fe3O4/PEI nano-composites phosphate removal adsorption mechanisms |
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