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成功合成了一种高岭土基新型多孔硅材料(ASM)并以FTIR,XRD,FE-SEM和N2吸附-脱附进行了系统的表征。ASM的制备过程涉及两步:SiO_3~(2-)提取和ASM的制备。SiO_3~(2-)提取的最优条件为煅烧温度为960℃,Na OH浓度为20%,反应温度为90℃,反应时间为90 min,在此条件下SiO_3~(2-)提取率为60.45%(w/w)。以此提取液为原材料,调整提取液中SiO_3~(2-)的浓度为12 g·L-1,反应温度为90℃,反应时间为60 min,然后再搅拌2 h可制得ASM。以此ASM对Ca~(2+)和Mg~(2+)进行吸附研究,脱除率分别可达94.99%和62.32%。
A novel kaolin based porous silicon material (ASM) was successfully synthesized and characterized by FTIR, XRD, FE-SEM and N2 adsorption-desorption. The preparation of ASM involves two steps: extraction of SiO_3 ~ (2-) and preparation of ASM. The optimum conditions for the extraction of SiO_3 ~ (2-) were calcination temperature 960 ℃, NaOH concentration 20%, reaction temperature 90 ℃ and reaction time 90 min. Under these conditions, the extraction rate of SiO_3 ~ (2-) was 60.45% (w / w). Using this extract as raw material, ASM was prepared by adjusting the concentration of SiO_3 ~ (2-) in the extract to 12 g · L-1, the reaction temperature was 90 ℃, the reaction time was 60 min, and then stirred for 2 h. ASM was used to study the adsorption of Ca 2+ and Mg 2+, with removal rates of 94.99% and 62.32%, respectively.