氨基改性稻壳基介孔SiO_2的制备及其吸附铅离子的研究

Preparation of Amino Modified Mesoporous Silica from Rice Huck and Its Adsorption of Lead Ions

利用稻壳灰为原料,以CTAB(十六烷基三甲基溴化铵)和P123(聚环氧乙烷—聚环氧丙烷—聚环氧乙烷三嵌段共聚物)为模板剂,分别在酸性和碱性条件下合成了3种介孔二氧化硅(SiO_2),并通过BET(氮气等温吸脱附)对其孔径、比表面积、孔容等进行表征。结果表明:以CTAB为模板剂,在碱性条件下制备介孔SiO_2最好;然后用3-氨丙基三乙氧基硅烷(APTES)对其进行改性,用氨基改性后的稻壳基介孔SiO_2吸附铅离子,在最佳吸附条件下,铅离子的去除率可达87.5%。

Respectively, under acid and alkaline conditions, three kinds of mesoporous silica were syn- thesized, using rice husk as raw material, and using cetyl trimethyl ammonium bromide （CTAB） and polyethylene oxide polyoxyethylene propylene copolymer （P123） as model. Pore size, specific surface area and pore volum of me- soporous silica were characterized by nitrogen isothermal adsorption （BET）. Experimental results showed： the me- soporous silica was best that was prepared by using CTAB as a template in alkaline condition. Then it was modified with 3 - aminopropyl triethoxy silane （APTES） , and lead ion was adsorbed with the amino modified mesoporous silica, under the optimum adsorption conditions, lead ion removal rate reached 87.5 %.