摘要
以十六烷基三甲基溴化铵(CTAB)为表面活性剂,以1,3,5-三甲基苯(TMB)为辅助剂,合成出了不同孔径的MCM-41介孔分子筛。通过吸水率、XRD、N2吸附-脱附测试手段表征了合成样品的结构与性质。结果表明,当TMB与CTAB的摩尔比小于3时,随着TMB:CTAB摩尔比(0.5:1~3:1)的增大,分子筛的晶胞参数(4.411~4.861nm)、平均孔径(3.5~4.1nm)、比表面积(899-1021m^2/g)都相应增加;当TMB与CTAB的摩尔比大于3时,随着TMB:CTAB摩尔比(3:1~4:1)的增大,分子筛的晶胞参数(4.861-4.584nm)相应减小。此外,还研究了不同孔径MCM-41在处理含汞废水方面的应用。结果显示,MCM-41介孔分子筛对废水中的二价汞具有良好的吸附性,且随着孔径的增大,吸附率(78%~92.6%)逐渐增大。
The molecular sieve MCM-41 with different pore diameters is synthesized with Cetyltrimethylammonium bromide(CTAB) as the liquid crystal template and 1,3, 5-trimethylbenzene(TMB) as assistant agent. The samples are characterized by water absorption ratio, powder X-ray diffraction (XRD) and N2 adsorption at 77. 4K. The results show that the unit cell parameters (4. 411-4. 861 nm), mean pore diameters (3. 5-4. 1 nm) and BET surface areas (899-1021 m^2/g) of MCM-41 become larger with the TMB and CTAB molar ratio (0. 5 : 1-3 : 1) increasing; the unit cell parameters (4. 861-4. 584 nm) get smaller with increasing the TMB and CTAB molar ratio (3 : 1-4 : 1). The adsorption property of MCM-41 with different pore diameters in Hg^2+ polluted water is studied. The results show that MM-41 has a good adsorption property to Hg^2+ , and the adsorption ratio to Hg^2+ (78-92. 6%) increases with the mean pore diameters (3. 5-4. 1 nm) of MCM-41 becoming larger.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2006年第F05期216-218,221,共4页
Materials Reports
基金
中国地质大学(北京)科研基金(51900961022)
关键词
MCM-41
孔径
辅助剂
吸附性
MCM-41, pore diameters, assistant agent, adsorption