Preparation of Magnetic Coal-measure Kaolinite Nanomaterials and Adsorption of Cr(Ⅵ)
This is an article in the field of mineral materials.In order to develop the high-value utilization technology of coal associated mineral resources kaolinite,coal-measure kaolinite nanomaterials(CKN)were prepared by indirect intercalation-liquid phase exfoliation method using coal gangue/slime,which is a solid waste product from washing,as raw materials.On this basis,the magnetic coal-measure kaolinite nanomaterials(MCKN)were prepared by chemical precipitation method,and the physical and chemical properties of MCKN were analyzed by XRD,SEM,BET,etc,and the different quality the ratio(m(Fe3O4):m(CKN)=1∶3,1∶4,1∶5,1∶6,1∶7)MCKN adsorption of Cr(Ⅵ)behavior was discussed.The results show that MCKN with a mass ratio of Fe3O4 to CKN of 1∶5 has the best adsorption effect on Cr(Ⅵ),MCKN has a good magnetic separation effect,and the adsorption rate of Cr(Ⅵ)can still be maintained after the fifth adsorption and desorption above 87％.CKN has a relatively complete morphology,a smooth surface,and a multilayer structure,some of which form nanotube structures,but some of them still exist in sheet-like structures.After loading Fe3O4,the surface of MCKN becomes rough,with an obvious 30～40 nm granular coating,indicating the successful preparation of MCKN,and the specific surface area of MCKN is higher than that of coal-measure kaolinite,while the specific surface area of MCKN is about twice that of CKN.The adsorption of Cr(Ⅵ)by MCKN conforms to the quasi-second-order kinetics,the model is chemical adsorption.The adsorption isotherm conforms to the Langmuir model,the saturated adsorption capacity is 17.26 mg/g,and the adsorption is an endothermic spontaneous process.In summary,the coal-measure kaolinite MCKN has good adsorption performance of Cr(Ⅵ),and is convenient for magnetic recovery and reuse,and can be used as a potential material for waste treatment in industrial applications.
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