球状碳气凝胶基磁性吸附材料制备

Preparation of Spherical Magnetic Adsorption Material from Resorcinol Formaldehyde

以十二烷基苯磺酸钠为表面活性剂,柠檬酸为催化剂,在硝酸镍存在下间苯二酚和甲醛经过溶胶-凝胶反应、还原气体保护下碳化处理得到球状碳气凝胶基磁性吸附材料。采用X射线衍射、扫描电子显微镜、磁力测试、粒径分析对所制备磁性吸附材料进行了表征,结果表明:材料的磁性能优良,比饱和磁化强度和矫顽力分别为17emu/g、124Oe,颗粒分布均匀,均值约5μm。通过原子吸收测试表明:材料对重金属离子Pb2+的饱和吸附容量可达62.5mg/g。

The sample was prepared by sol-gel polymerization of reaction system and subsequent carbonization of the gelated intermidate synthesized from the reaction of formaldehyde,resorcinol and nickel nitrate with citric acid and sodium dodecyl sulfate as catalyst and dispersing agent,respectively.It was characterized by X-ray diffraction,scanning electron microscopy,magnetization measurements and particle size distribution test.The results show that the material have an excellent magnetic property with value of saturation magnetization of 17 emu/g and its coercivity is determined to 124 Oe and theirs particles of 5 μm have uniform distribution.The adsorption capacity of the sample for heavy metal ions of Pb2＋ can achieve 62.5 mg/g via atomic absorption test.