NaA/MCM-41微介复合分子筛的合成与表征

按n(SiO2)∶n(Na2O)∶n(Al2O3)∶n(H2O)=1∶1.5∶0.5∶100加料,在90℃下水热晶化3 h合成NaA微孔分子筛,再按n(SiO2)∶n(NaOH)∶n(CTAB)∶n(H2O)=1∶0.3∶0.3∶90依次添加到NaA微孔分子筛中,于110℃下水热晶化24 h合成NaA/MCM-41微介复合分子筛,并采用XRD、SEM(EDS)和TEM等方法对其进行了表征。吸附阳离子红X-5GN模拟染料废水结果表明,在50 mLρ(阳离子红X-5GN)=20 mg/L的水溶液中,NaA/MCM-41微介复合分子筛的投加量为0.6 g/L、pH=6、振荡时间为60 min时,脱色率可达到96.4%,比NaA分子筛和MCM-41介孔分子筛独自吸附脱色效果要好。

Synthesis and Characterization of NaA/MCM-41micro-mesoporous composite molecular sieve

NaA of microporous zeolites was prepared by hydrothermal synthesis method with molar ratio of n(SiO2)∶ n(Na2O)∶ n(Al2O3)∶ n(H2O)=1∶ 1.5∶ 0.5∶ 100 at 90 ℃ for 3 h,then followed by the addition of chemicals to the microporous zeolite NaA with molar ratio of n(SiO2)∶ n(NaOH)∶ n(CTAB)∶ n(H2O)=1∶ 0.3∶ 0.3∶ 90,composite micro-mesoporous molecular sieve of NaA/MCM-41 was successfully synthesized at 110 ℃ for 24 h.The structures of composite materials compared with the mechanical mixture were characterized by means of powder XRD,SEM(EDS) and TEM.The results show that: in 50 mL ρ(cationic red X-5GN)=20 mg/L solution,NaA/MCM-41 micro-mesoporous molecular sieve composite dosage is 0.6 g/L,pH is 6,the oscillation time is 60 min,the decolorization rate is 96.4%.Such adsorption decolorization effect is better than that of NaA zeolite and MCM-41 mesoporous molecular sieve.