Preparation of Amino-functionalized SBA-15 and Its Adsorption Property to Cr3+

Amino-functionalized mesoporous material SBA-15 (NH2-SBA-15) was prepared by a post-grafting method using 3-aminopropyltrimethoxy-silane (APTMS). The NH2-SBA-15 was characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and N2 adsorption/desorption isotherms. It was proved that ATPMS was grafted on SBA-15, and NH2-SBA-15 remained to keep the hexagonal mesoporous structure. Adsorption property of NH2-SBA-15 to Cr3+ ion was studied. It was found that in an aqueous medium of pH 4.5 containing 140 mg·L-1 Cr3+ ion, the NH2-SBA-15 behaved to adsorb strongly and equilibrium of adsorption was achieved after 6h at the temperature of 60 ℃, and the adsorptive capacity of Cr3+ ion at equilibrium was 15.59 mg·g-1.