氨水诱导硅核自组装制备介孔SiO_2

Preparation of Mesoporous SiO_2 via Ammonia-Induced Self-Assembly of Primary Silica Nanoparticles

在无模板剂的条件下，通过控制氨水用量，利用正硅酸乙酯水解制备了粒径约20nm的SiO2初级粒子；随后用过量氨水诱导SiO2初级粒子交联生长，得到孔径在10～50nm、孔容达2．05cm^3·g^-1的介孔SiO2；考察了介孔SiO2的吸附性能．结果表明，所制备的介孔SiO2具有优良的吸附性能．

Primary silica nanoparticles with an average size of 20 nm were prepared via ammonia- catalyzed hydrolysis of tetraethyl orthosilicate （TEOS） in the absence of template. Then excessive ammonia was introduced to induce crosslinking of the as-prepared primary silica nanoparticles generating mesoporous SiO2 with a pore size of 10-50 nm and pore volume of 2.05 cm^3·g^-1. The adsorption behavior of the mesoporous SiO2 was evaluated. Results indicate that the as-prepared mesoporous SiO2 possesses excellent adsorption ability.