微波法改性煤系高岭土的制备及其性能

以内蒙古鄂尔多斯煤系高岭土为原料，使煤系高岭土与浓硫酸在微波条件下反应，制得具有较高比表面积的改性煤系高岭土。通过调节反应温度及反应时间进行改性实验，确定了最佳改性条件。与传统改性方法相比，微波法可一步完成改性，降低了反应温度，节约了反应时间。利用X射线衍射（XRD）、氮气吸附-脱附、化学成分分析、红外光谱分析（FT-IR）、透射电镜（TEM）等手段对改性前后样品进行了表征。结果表明，微波法改性煤系高岭土为具有较高比表面积、以介孔为主且有大量微孔存在的多孔结构材料，其比表面积从未改性时13 m2/g增大至改性后299 m2/g，其对次甲基蓝溶液最大吸附率从未改性时73.7%增大至改性后91.1%，可以作为良好的吸附材料。

Microwave assisted synthesis of modified coal-bearing kaolinites and properties thereof

Coal-bearing kaolinite in Ordos，Inner Mongolia，was treated with concentrated sulfuric acid under microwave ex-posure to improve its surface area.The optimum conditions were confirmed by adjusting the reaction temperature and reaction time.Comparing with the traditional modification method，this one could complete the modification in one step and reduced the reaction temperature and saved the reaction time.The obtained sample was characterized by X-ray diffraction analysis， N2 adsorption-desorption analysis，elemental analysis，Fourier transformed infrared spectroscopy，and transmission electron mi-croscopy.Results showed that the obtained sample was the porous structure material mainly with mesoporous and much micro-porous，the surface area increased from 13 m2/g to 299 m2/g，the maximum adsorbed percentage for methylene blue increa-sed from 73.7% to 91.1%.Owing to its high surface area，the synthesized material has the potential uses in adsorption.