蒸发诱导三组分共组装制备有序介孔碳的制备条件对介观结构稳定性的影响

Influence of Preparation Conditions on Structural Stability of Ordered Mesoporous Carbons Synthesized by Evaporation-induced Triconstituent Co-assembly Method

采用蒸发诱导三组分共组装方法制备一系列的有序介孔碳．并利用X射线衍射仪、透射电镜以及N2吸附脱附仪探讨了碳含量，老化时间以及酸度对其介观结构稳定性的影响．结果表明：碳含量山36％增加到46％时，介观结构的稳定性随之增强，继续增加碳含量反而破坏了其结构稳定性；老化时间从0．5h逐渐增加到50h，其中2．0h介孔碳的结构稳定性较优且有效减少了介孔碳制备过程中的骨架收缩：0．2-1．2mol／L的HCl均能制得高度有序的介孔碳，且当酸度接近硅的等电点时，得到的介扎碳具有较稳定的介观结构．在46％碳含量、老化时间2．0h、0．2mol／LHCl制得的有序介孔碳具有最稳定的介观结构且BET表面积高达2281m^2/g.

Various ordered mesoporous carbons （OMCs） have been prepared by evaporation-induced trieonstituent co-assembly method. Their mesostructural stability under different carbon content, aging time and acidity were conveniently monitored by X-ray diffraction, transmission electron microscopy, and N2 sorption isotherms techniques. The results show mesostruetural stability of OMCs is enhanced as the carbon content increases from 36% to 46%, further increasing carbon content deteriorates the mesostructural stability. Increasing aging time from 0.5 h to 5.0 h make the mesostructural stability go through an optimum （2.0 h） and gradually reduce framework shrinkage of the OMCs. Highly OMCs can only be obtained in the acidity range of 0.2-1.2 mol/L HC1, when the acidity is near the isoelectrie point of silica, the resulting OMCs have the best mesostructure stability. Under the optimum condition, the carbon content of 46%, aging time of 2.0 h, and 0.2 mol/L HCl, the resulting OMCs have the best mesostrueture stability and the highest BET surface areas of 2281 m2/g.