Polyamidoximation of Hollow Mesoporous Silica and Its Application in Adsorption of Cr (VI)

Polyamidoximation of hollow mesoporous silica (HMS/PAO) was prepared by tranforming the cyano groups in polyacrylonitrile grafted from hollow mesoporous silica (HMS) through polymerization of acrylonitrile initiated by ceric ammonium nitrate. The hollow mesoporous silica was prepared by a facile one pot solgel method. The microstructure and characteristic of the HMS and HMS/PAO were examined by Fourier transform Infrared spectra (FTIR), X-ray diffraction, scanning electron microscope (SEM), N-2 adsorption desorption isotherm. The results showed that the diameter of the HMS was about 400 nm, and the size of the mesoporous was ca. 11. 0 nm. The size of the mesoporous was ca. 4. 6 nm and more uniform and smaller. As potassium dichromate solution (K2Cr2O7) was used as a target solution for detecting adsorption ca. pacity of the prepared HMS/PAO, the adsorption chromium kinetics was consistent with the pseudo second order kinetics model by analyzing the adsorption amount as a function of the sorbent dispersed duration in solu. tion at pH = 2..0. The adsorption capacity of HMS/PAO for chromium was as much as 0. 46 mmol/g. There. fore, it is an adsorbent with high efficiency.