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以3-氨基丙基三乙氧基硅烷(APTS)和N-[3-(二甲氧基甲硅烷基)丙基]乙二胺(TPED)为表面胺基修饰剂,通过化学接枝法制备了胺基修饰的SBA-15介孔硅片(SBA-15-EHP)吸附剂。采用SEM、全自动气体吸附仪、XRD、TGA等测试手段对胺基修饰的SBA-15-EHP进行表征,研究了胺基修饰的SBA-15-EHP的表面形貌,孔隙结构,晶体结构,SBA-15-EHP表面胺基的接枝量及CO_2的吸附特性。结果表明,在常压、35℃下,TPED修饰的SBA-15-EHP的CO_2吸附能力优于APTS修饰的SBA-15-EHP,最大的CO_2吸附容量为53.0mg/g,这是由于胺基与CO_2发生酸碱反应形成盐类的可逆化学吸附过程所致。
Using 3-aminopropyltriethoxysilane (APTS) and N- [3- (dimethoxysilyl) propyl] ethylenediamine (TPED) as surface amine modifier, An amine-modified SBA-15 mesoporous silica (SBA-15-EHP) adsorbent was prepared. The amino-modified SBA-15-EHP was characterized by SEM, automatic gas sorbent, XRD and TGA. The surface morphology, pore structure, crystal structure, Grafting amount of amine groups on SBA-15-EHP surface and adsorption characteristics of CO_2. The results showed that the CO 2 adsorption capacity of TPED-modified SBA-15-EHP was better than that of APTS modified SBA-15-EHP at 35 ℃ under atmospheric pressure. The maximum CO 2 adsorption capacity was 53.0 mg / g, Reacts with CO 2 to form a salt by acid-base reaction reversible chemisorption process.