CAJ | 학술논문

采用简单的方法合成高浓度氨基修饰的高度有序氧化硅材料并深入研究氨基官能化材料的孔结构以及氨基的存在状态和可利用性.结果表明,氨基基团共价连接到SBA-15的孔表面,即使初始合成体系中的APTES(氨丙基三乙氧基硅烷)浓度高达30mol%时材料依然保持高度的有序性.合成体系中APTES浓度为20%的样品还保持良好的介孔结构,比表面积为680 m2·g-1,孔容为0.89 cm3·g-1,此介孔结构中的氨基官能团对镍离子表现出很强的亲和力,Ni2+的吸附量高达1.88 mmol·g-1,相比之下未官能化的SBA-15对Ni2+没有吸附作用.当初始合成体系中APTES的浓度进一步增大到30%时,修饰到介孔氧化硅材料的氨基含量也随之增大,但由于材料的孔隙度急剧降低,这些氨基的可利用性也降低.
채용간단적방법합성고농도안기수식적고도유서양화규재료병심입연구안기관능화재료적공결구이급안기적존재상태화가이용성.결과표명,안기기단공개련접도SBA-15적공표면,즉사초시합성체계중적APTES(안병기삼을양기규완)농도고체30mol%시재료의연보지고도적유서성.합성체계중APTES농도위20%적양품환보지량호적개공결구,비표면적위680 m2·g-1,공용위0.89 cm3·g-1,차개공결구중적안기관능단대얼리자표현출흔강적친화력,Ni2+적흡부량고체1.88 mmol·g-1,상비지하미관능화적SBA-15대Ni2+몰유흡부작용.당초시합성체계중APTES적농도진일보증대도30%시,수식도개공양화규재료적안기함량야수지증대,단유우재료적공극도급극강저,저사안기적가이용성야강저.
A facile strategy was used to synthesize highly ordered mesoporous silica SBA-15 functionalized with high concentration of amino groups, which seems to be rather difficult to be incorporated into mesoporous silica without disrupting the ordered mesoscopic structure compared to other functional groups. The pore structure of functionalized materials, together with the presence and accessibility of functional groups, were investigated in detail. It is shown that amino groups are attached covalently to the pore wall of SBA-15 and the ordered mesoscopic architecture of the functionalized samples remains almost intact even with a large concentration of aminopropyltriethoxysilane (APTES) up to 30mol% in the initial synthetic mixture. The samples with 20mol% takes place with unfunctionalized mesoporous silica. The amount of amino groups incorporated increase as the APTES concentration further increases to 30mol%, but the amino groups are less accessible due to the dramatic decrease in the porosity of functionalized samples.