Abstract: Surface modification with silicon coupling reagent was used to treat ultrafine silicon dioxide waste material in fiber manufacturing. Then mesoporous powder of SiO2 was synthesized by using the modified material. The experimental results with Fourier transform infrared (FTIR) spectroscopy and thermogravimetric (TG) analyzer showed that the surface Si－OH bonds infrared intensity of ultrafine silicon dioxide decreased and thermogravimetric loss increased，indicating reaction of the surface Si－OH bonds of ultrafine silicon dioxide with silicon coupling reagent. By laser light scattering (LLS) determination the particle size of ultrafine silicon dioxide decreased and the dispersibility was obviously improved，indicating enhanced hydrophobic property of ultrafine silicon dioxide after modification. The structure appearance of silicon dioxide powders was characterized with transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results showed that it was possible to synthesize ordered porous material of SiO2 at an appropriate temperature. This surface modification provides a wide market to reuse ultrafine silicon dioxide waste material.

摘要： 从回收利用二氧化硅废料颗粒的角度出发，用硅烷类偶联剂对废料颗粒进行表面改性，并将其作为合成有序硅基孔结构材料的原料。傅里叶红外光谱、热重分析、激光光散射结果表明达到了改性目的。然后用TEM和SEM研究了晶化温度对硅基孔材料形态的影响，发现优化合成条件可以得到有序结构材料，为超细二氧化硅废料的回收利用提供了可能。