Abstract
Palygorskite has excellent sorption properties due to its porous structure and fibrous morphology. In this paper, the thermal modified palygorskite was prepared and characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM), N2 adsorptiondesorption and thermogravimetric-differential scanning calorimetry (TG-DSC) analysis. The adsorption properties of the raw palygorskite and the thermal modified palygorskite were investigated by removal of methylene blue (MB) from aqueous solution. The effects of the calcination temperature, the initial MB concentration and the pH value on the MB removal were evaluated. The results show that the structure of palygorskite was destroyed gradually with increasing the calcination temperature, and the adsorption capacity of the palygorskite can be improved by thermal modification in appropriate temperature ranges. The isotherms and the kinetic data of the MB adsorption onto the modified palygorskite were studied by the Freundlich model and the pseudo-s...
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