论文部分内容阅读
海泡石除铁后用2 mol/L盐酸在80℃下处理3 h,使海泡石中的杂质和镁、铁等阳离子与热酸反应,通过过滤和洗涤去除,烘干后焙烧,得到脱镁海泡石。然后加十六烷基三甲基溴化铵(CTABBr)和去离子水,配比为n(CTAB):n(SiO_2):n(H_2O)=1:0.6:30的溶液,搅拌2 h后老化24 h,用NaOH调节pH值到12后,在110℃下密封水热合成反应72 h,用去离子水水洗、干燥后在空气中于550℃下焙烧,得到具有介孔特征的MCM-48介孔分子筛。用XRD、TEM、FT-IR、N_2吸附-脱附等方法,分析表征了MCM-48介孔分子筛的物相结构、孔径分布、比表面积等。结果表明,介孔MCM-48分子筛对亚甲基蓝的吸附量约为200 mg/g,吸附规律符合Frendlich等温吸附关系式。
Sepiolite iron with 2 mol / L hydrochloric acid at 80 ℃ for 3 h, so that impurities in sepiolite and magnesium, iron and other cations with hot acid reaction, filtered and washed to remove, after drying roasting, get Magnesium sepiolite. Then add cetyl trimethyl ammonium bromide (CTABBr) and deionized water, the ratio of n (CTAB): n (SiO 2): n (H 2 O) = 1: 0.6: 30 solution, stirred for 2 h Aging 24 h, pH adjusted to 12 with NaOH, at 110 ℃ sealed hydrothermal synthesis reaction 72 h, washed with deionized water, dried and calcined at 550 ℃ in air to obtain mesoporous MCM- 48 mesoporous molecular sieve. The phase structure, pore size distribution, specific surface area and other properties of MCM-48 mesoporous molecular sieve were characterized by XRD, TEM, FT-IR and N2 adsorption-desorption. The results show that the adsorption capacity of mesoporous MCM-48 molecular sieve to methylene blue is about 200 mg / g, and the adsorption law accords with Frendlich isotherm adsorption equation.