磁性海藻酸钠复合凝胶球的制备及对铅离子的吸附性能  

Preparation of magnetic sodium alginate composite gel balls and their adsorption properties for Pb

作　　者：王珏 郭明[2] 孙立苹[3] WANG Jue;GUO Ming;SUN Liping(College of Forestry and Biotechnology,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;College of Science,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;College of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江农林大学林业与生物技术学院,浙江杭州311300 [2]浙江农林大学理学院,浙江杭州311300 [3]浙江农林大学环境与资源学院,浙江杭州311300

出　　处：《浙江农林大学学报》2020年第6期1112-1119,共8页Journal of Zhejiang A&F University

基　　金：浙江省自然科学基金资助项目(LY18B070003,LGN20B070001)。

摘　　要：【目的】磁性凝胶微球是新型吸附剂,其高效去除污染物的功能和重复利用性能受到热切关注,因此制备1种新型的磁性凝胶球极有必要。【方法】将离子共沉淀法制备的磁性粒子(MNP)用作载体进行硅烷化反应以合成具有氨基末端的磁性纳米颗粒(AM)。静电作用将海藻酸钠(SA)包覆在磁性颗粒表面,制备了1种富含氨基、羟基和羧基多官能团的新型磁性复合凝胶球(SA@AM)。利用傅立叶变换红外光谱(FTIR)、元素分析仪、X射线衍射仪(XRD)、扫描/透射电子显微镜(SEM/TEM)、振动样品磁力计(VSM)表征产物,并开展产物对重金属离子吸附性能研究。【结果】成功制备的目标功能复合凝胶球(SA@AM)呈顺磁性磁铁矿晶型,SA@AM凝胶球的尺寸为1.5~2.0mm;MNP、 AM、SA@AM的磁化值分别为13.8、13.4和6.85 A·m2·kg-1。吸附实验显示:SA@AM对重金属铅离子(Pb2+)表现出高效吸附能力,对Pb2+的最大吸附量为105.82 mg·g-1,吸附机理更符合Langmuir等温吸附模型。重复吸附-解吸实验表明:SA@AM对Pb2+的去除率≥76%。【结论】新型海藻酸钠磁性复合凝胶球对重金属Pb2+有着优异的吸附能力,同时磁性凝胶球有着良好的再生性能。[Objective] Magnetic gel balls are new adsorbents which can efficiently remove pollutants and can be reused. Therefore, it is necessary to prepare a new type of magnetic gel ball. [Method] Magnetic particles(MNP) prepared by the ion co-precipitation method were used as carries for silanization reaction to synthesize magnetic nanoparticles(AM) with amino terminals. A novel magnetic composite gel ball(SA@AM) containing amino, hydroxyl and carboxyl multifunctional groups was prepared by coating sodium alginate(SA) on the surface of magnetic particles with electrostatic effect. Fourier transform infrared spectroscopy(FTIR), elemental analyzer, X-ray diffractometer(XRD), scanning/transmission electron microscope(SEM/TEM), and vibrating sample magnetometer(VSM) were used to characterize the product, and the adsorption properties of the products for heavy metal ions were studied. [Result] The target functional composite gel ball(SA@AM) successfully prepared was of paramagnetic magnetite crystal type, and the size of the SA@AM gel ball was1.5-2.0 mm. The magnetization values of MNP, AM, SA@AM were 13.8, 13.4, and 6.85 A·m2·kg-1,respectively. Adsorption experiments showed that the maximum adsorption capacity of heavy metal Pb+2 by SA@AM was 105.82 mg·g-1, and the adsorption mechanism was more in line with the Langmuir isothermal adsorption model. Repeated adsorption-desorption experiments showed that the removal rate of Pb2+ by SA@AM was more than 76%. [Conclusion] The new sodium alginate magnetic composite gel ball has excellent adsorption capacity for heavy metal ions Pb2+, and the magnetic gel ball has good regeneration properties.

关 键 词：环境保护学 磁性纳米颗粒 海藻酸钠 吸附性能 铅离子 

分 类 号：X52[环境科学与工程—环境工程]