Wang W.-Q.,Key Laboratory of Waste Solid Treatment and Resource Recycle of Ministry of Education |
Wang W.-Q.,University of Science and Technology of China |
Feng Q.-M.,Key Laboratory of Waste Solid Treatment and Resource Recycle of Ministry of Education |
Feng Q.-M.,University of Science and Technology of China |
And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2012
The effect of thermal treatment temperature on the crystal structure and microtopography of palygorskite were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy (SEM). The zeta (ζ) potential, specific surface area and the saturation ion exchange capacity to Cu2+ of thermal activated palygorskite were also measured by zeta potential analyzer, specific surface area analyzer, atomic absorption spectrometer (AAS). The results indicate that the zeta potential of palygorskite is not distinct changed by thermal activation temperature. The adsorbed water and partial coordinated water are dehydrated, and the specific surface area is distinct increasing, but the change of crystal structure is unconspicuous when the thermal activation temperature is below 250°C. The coordinated water and constitution water are dehydrated, the folded structure appears and the surface activated center of palygorskite was increased with the thermal activated temperature increasing from 350 to 650°C, the crystal structure of palygorskite was completely destructed at 750°C. The specific surface area is regularly decreasing along with the thermal activated temperature increasing from 350 to 750°C. The saturation ion exchange capacity to Cu2+ of thermal activated palygorskite is only related with the thermal treatment temperature and reaches the maximum at 450°C.