纳米Fe_3O_4/高岭土复合粉体制备及其对亚甲基蓝吸附性能研究  

Preparation of Nano-Fe_3O_4/Kaolin Composites and Their Adsorption Property for Methylene Blue

作　　者：陈培[1] 许红亮[1] 张敏捷[1] 邵刚[1] 陈德良[1] 张锐[1,2] 

机构地区：[1]郑州大学材料科学与工程学院,郑州450001 [2]郑州航空工业管理学院,郑州450015

出　　处：《人工晶体学报》2015年第3期711-716,共6页Journal of Synthetic Crystals

基　　金：河南省高等学校重点科研项目计划(15A430010);郑州大学研究生教育基金

摘　　要：以天然高岭土为载体、利用化学共沉淀法成功地制备出纳米Fe3O4/高岭土复合粉体。采用XRD、FSEM对复合粉体的物相组成、粒径、显微结构、形貌进行了表征,并研究了其磁分离性能和对亚甲基蓝（MB）的吸附性能。结果显示,复合粉体中的铁氧化物呈单一的Fe3O4相,Fe3O4晶粒的尺寸为10~30 nm,且均匀负载于高岭石晶体表面。当Fe3O4、高岭土质量比为1∶5时,复合粉体的磁分离率高达90.12%,并具有良好的吸附性能。复合粉体对MB的去除率随着吸附时间的延长、吸附温度的升高、溶液p H的增大和投入量的增加而逐步提高,随着MB溶液初始浓度的增大而逐步减小;对MB的吸附量随初始浓度的增大而逐步增大。With natural kaolin as the carrier, the nano-Fe3O4/ Kaolin composites were prepared successfully by chemical co-precipitation method. The phase composition,particle size,microstructure and morphology of the composites were characterized by X-ray diffraction（ XRD） and Field Emission Scanning Electron Microscopy（ FSEM）,and its magnetic separation performance and the adsorption properties to methylene blue（ MB） were studied. The results show that the iron oxide in the composites is a single Fe3O4 phase with the grain size from 10 nm to 30 nm. The Fe3O4 grains are evenly loaded on the surface of kaolinite crystals. When the mass ratio of Fe3O4 to kaolin is 1 ∶ 5,the composites have a magnetic separation rate of 90. 12% and excellent adsorption performance in aqueous solution. The removal rate of the composites to MB increases gradually with the extension of adsorption time,the elevation of adsorption temperature,the increment of p H value and input quantity of composites,and decreases with the increasing of the initial concentration of MB. However,the adsorption capacity to MB increases gradually with the increasing of initial concentration of MB.

关 键 词：纳米Fe3O4/高岭土复合材料 化学共沉淀 亚甲基蓝 吸附 

分 类 号：TB332[一般工业技术—材料科学与工程]