Ma Kaixuan, Wang Qiu, Rong Qianyun, Zhang Dapeng, Cui Shihai, Yang Jing
Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, College of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China E-mail:
Water Sci Technol. 2017 Nov;76(9-10):2680-2689. doi: 10.2166/wst.2017.384.
Nanoscale zero-valent iron (NZVI) was first assembled on magnetic carbon/FeO (CM) with a combination of hydrothermal and liquid phase reduction methods. The novel NZVI@CM magnetic nanocomposites have the merits of large surface area, unique magnetic property, low cost and environmental friendliness. They can be used for Pb(II) removal in aqueous solution. The materials were characterized by using transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) adsorption. The various parameters, such as reaction time, dosage of catalyst, solution pH and acid ions concentrations were studied. The removal efficiency of Pb(II) can be obviously increased by the combination of appropriate CM and NZVI. The removal efficiency of Pb(II) is 99.7% by using 60 mg of NZVI@CM at pH 7. The kinetics study indicates that the Pb(II) removal accords to pseudo-second-order kinetics model.
通过水热法和液相还原法相结合，首次在磁性碳/FeO（CM）上组装了纳米零价铁（NZVI）。新型NZVI@CM磁性纳米复合材料具有比表面积大、独特的磁性、低成本和环境友好等优点。它们可用于去除水溶液中的Pb(II)。通过透射电子显微镜（TEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、热重分析（TGA）、振动样品磁强计（VSM）、X射线光电子能谱（XPS）和布鲁诺尔-埃米特-泰勒（BET）吸附等手段对材料进行了表征。研究了反应时间、催化剂用量、溶液pH值和酸离子浓度等各种参数。适当的CM和NZVI组合可显著提高Pb(II)的去除效率。在pH值为7时，使用60 mg的NZVI@CM，Pb(II)的去除效率为99.7%。动力学研究表明，Pb(II)的去除符合准二级动力学模型。
