氨基功能化SBA-15的制备及对三价铬吸附性能的研究

Preparation of Amino-functionalized SBA-15 and Its Adsorption Property to Cr^(3+)

以3-氨丙基三乙氧基硅烷(APTMS)为功能化试剂,用后嫁接法对介孔分子筛SBA-15进行化学改性,制备氨基功能化NH2-SBA-15。采用X射线衍射、红外光谱、透射电子显微镜、扫描电子显微镜、N2吸附-脱附等手段对NH2-SBA-15进行了表征。结果表明:ATPES成功地嫁接到介孔材料SBA-15上,NH2-SBA-15仍保持了SBA-15六方介孔结构。将此材料作为Cr3+的有效吸附剂进一步研究NH2-SBA-15的吸附性能,结果表明:介质pH值为4.5、温度为60℃、Cr3+溶液质量浓度为140mg.L-1、吸附时间为6h时,吸附剂的吸附量达15.59mg.g-1。

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 NHe-SBA-15 remained to keep the hexagonal, mesoporous structure. Adsorption property of NH2-SBA-15 to Cr^3＋ ion was studied. It was found that in an aqueous medium of pH 4. 5 containing 140 mg·L^-1 Cr^3＋ 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 Cr^3＋ ion at equilibrium was 15.59 mg ·L^-1.