用硼泥制备多孔二氧化硅及其性能表征

Preparation of Porous Silica with Boron Mud and Its Characterizations

以硼泥为原料，采用盐酸酸浸法制备了多孔二氧化硅，通过x射线衍射（XRD）、红外光谱（Pr-IR）、扫描电镜（SEM）和氮吸附脱附手段对其结构与性能进行了表征，通过吸附水中罗丹明B来测试其吸附性能。结果表明，多孔二氧化硅中SiO2含量为86．04％，且以无定形SiO2为主；其结构蓬松，存在大量狭缝孔，孔径在2-39nm之间连续分布，吸附平均孔径为6．992nm，BET多点比表面积为147m^2／g；多孔二氧化硅对水中罗丹明B的吸附性能较好，浓度为30mg／L时吸附量为1．23mg／g。

Porous silica was prepared through leaching by hydrochloric acid from boron mud. Its properties have been characterized by XRD, FT-IR, SEM and N2 absorption-desorption, and its absorption capacity was tested by absorption of Rhodamine B in aqueous. The results show that the SiO2 content of porous siliea is 86.04%, and the SiO2 is main in amorphous. The porous silica has fluffy structure, lots of slit pore. The pore size continuously distributes around 2-39 nm, average pore size is 6. 992 nm and the BET specific surface area is 147 m^2/g. The porous silica shows a better performance for the absorption of Rhodarnine B in aqueous. When the concentration of Rhodamine B is 30 mg/L, the absorption amount is of 1.23 mg/g.