| 磁性海藻酸钠复合凝胶球的制备及对铅离子的吸附性能 |
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| 引用本文： | 王珏,郭明,孙立苹. 磁性海藻酸钠复合凝胶球的制备及对铅离子的吸附性能[J]. 浙江农林大学学报, 2020, 37(6): 1112-1119. DOI: 10.11833/j.issn.2095-0756.20190751 |
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| 作者姓名： | 王珏 郭明 孙立苹 |
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| 作者单位： | 1.浙江农林大学 林业与生物技术学院,浙江 杭州 3113002.浙江农林大学 理学院,浙江 杭州 3113003.浙江农林大学 环境与资源学院,浙江 杭州 311300 |
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| 基金项目： | 浙江省自然科学基金资助项目(LY18B070003, LGN20B070001) |
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| 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1.5~2.0 mm;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。图10表1参25
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| 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 |
| 收稿时间： | 2019-12-21 |
Preparation of magnetic sodium alginate composite gel balls and their adsorption properties for Pb2+ |
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| WANG Jue,GUO Ming,SUN Liping. Preparation of magnetic sodium alginate composite gel balls and their adsorption properties for Pb2+[J]. Journal of Zhejiang A&F University, 2020, 37(6): 1112-1119. DOI: 10.11833/j.issn.2095-0756.20190751 |
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| Authors: | WANG Jue GUO Ming SUN Liping |
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| Affiliation: | 1.College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China2.College of Science, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China3.College of Environment and Resources, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China |
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| Abstract: | 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 was 1.5?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 Pb2+ 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. [Ch, 10 fig. 1 tab. 25 ref.] |
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