多形貌中空介孔SiO2的可控合成及复合物对Cu2+的吸附还原

以间苯二酚/甲醛(RF)树脂为软模板, 正硅酸乙酯(TEOS)为硅源, 十六烷基三甲基溴化铵(CTAB)为制孔剂, 采用一锅溶胶-凝胶法制备了多形貌中空介孔二氧化硅微球(HMSM). 通过改变甲醛用量调控软模板RF树脂的结构, 可以获得一系列不同形貌及结构的HMSM, 随着甲醛用量的增加, HMSM结构表现为单层壳空心球、 蛋黄壳空心球、 双层壳空心球等结构. 其中具有蛋黄壳空心球结构的HMSM比表面积可达691 m ²/g, 孔体积达2.23 cm ³/g, 孔径均匀(3.5 nm). 以硝酸铈铵为引发剂, 在具有蛋黄壳空心球结构的HMSM中引发丙烯腈自由基聚合, 并将支链聚丙烯腈上的氰基偕胺肟化, 制得HMSM接枝聚偕胺肟(HMSM-g-PAO). 以100 mg/L的CuCl₂溶液为目标溶液, 在pH=4.0时测试合成的HMSM-g-PAO对Cu ²⁺的吸附效果, 发现吸附平衡时Cu ²⁺吸附量达134 mg/g.

Controllable Synthesis of Multi-morphological Hollow Mesoporous SiO2 and Adsorption Reduction of Cu 2+ by Its Composites ?

A concise and facile one-pot sol-gel method was proposed by using resorcinol/formaldehyde(RF) resin as soft template, tetraethyl orthosilicate(TEOS) as silicon source, hexadecyl trimethyl ammonium bromide(CTAB) as pore-forming agent to fabricate hollow mesoporous silica microspheres(HMSM). A series of HMSM with different structures and topography was obtained by simply adjusting the formaldehyde amount. As the formaldehyde amount increased, the morphology of the as-prepared hollow spheres changed from single-shelled, to yolk-shelled, double-shelled and then turned back. The yolk-shelled HMSM possessed a large specific surface area(691 m ²/g), large pore volume(2.23 cm ³/g), and uniform mesopores(3.5 nm). HMSM-g-PAO(PAO=polyamidoximation) was prepared by tranforming the cyano groups in polyacrylonitrile(PAN) of 6-HMSM-g-PAN, which was prepared from yolk-shelled HMSM through polymerization of acrylonitrile initiated by ceric ammonium nitrate. As 100 mg/L CuCl₂ solution was used as the target solution, the adsorption and reduction effect of HMSM-g-PAO was tested at pH=4.0, and the adsorption amount could reach 134 mg/g when adsorption balanced.