摘要
采用三甲基氯硅烷（TMCS）对MIL-101（Cr）进行表面改性处理以改变材料的疏水亲油性能，经XRD、FT-IR、N2吸附和脱附、表面羟基滴定等表征证明TMCS分子通过与MIL-101（cr）表面羟基缩合进入骨架。采用C5～C7正构烷烃模拟油气组份，测试了MIL-101（Cr）和TMCS．MIL-101（Cr）的油气和水蒸气的静态吸附性能，并考察了相对湿度对油气动态吸附性能的影响。结果表明，25℃下C5～C7正构烷烃以及水蒸气在TMCS-MIL-101（Cr）上静态吸附量分别为0．433、0．510、0．464和0．233g·^-1，与MIL-101（Cr）相比TMCS-MIL—101（Cr）的C5～C7正构烷烃静态吸附量较高，水蒸气静态吸附量较低；根据穿透曲线计算，在相对湿度97％时TMCS—MIL-101（CO对C5～C7正构烷烃的动态吸附量为相对湿度0％时的80％以上。改性后材料的油气静态吸附性能提升明显，且水蒸气对TMCS-MIL-101（Cr）油气吸附影响较小。
MIL-101 （Cr） was modified with trimethylchlorosilane（TMCS） to adjust its hydrophobic properties, and XRD, N2 adsorption and desorption, FT-IR spectra and surface hydroxyl titration results confirmed that TMCS molecules were grafted via condensation reaction with hydroxyl groups on MIL-101（Cr） surface. Static adsorption capacities of gasoline vapor and water vapor on MIL-101（Cr） and TMCS-MIL-101（Cr） were measured, and the effect of relative humidity on dynamic adsorption of gasoline vapor was also investigated with C5-C7 n-alkanes as the model feed. Experimental results show that static adsorption capacities of C5-C7 n-alkanes and water vapor on TMCS-MIL-101（Cr） at 25℃ are 0.433 g.g^-1, 0.510 g.g^-1, 0.464 g.g^-1 and 0.233 g.g^-1 respectively. TMCS-functionalized materials show higher C5-C7 n-alkanes adsorption efficiency and lower water vapor adsorption efficiency when comparing to MIL-101（Cr）. The dynamic adsorption capacities of n-alkanes on TMCS-MIL-101（Cr） at relative humidity 97% were 80% higher than that at relative humidity 0%. Gasoline vapor adsorption performance is significantly enhanced after modification, and water vapor has few effects on gasoline vapor adsorption on TMCS-MIL-101 （Cr）.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2016年第4期814-821,共8页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(21276029
51574044
21406018)
江苏省自然科学基金(BK20131142)
江苏省高校青蓝工程创新团队
江苏省333高层次人才培养工程(BRA2015375)
