剪纸状碳的合成及其吸附性能(英文)

Synthesis of decoupage-like carbon sheets and their adsorption properties

以二茂铁和四氯乙烯作为反应物,采用热解法在600℃反应10h得到一种高产率的剪纸状的碳片.扫描电镜的结果表明,剪纸状碳材料的厚度为20～40nm,宽度为100～200nm.通过氮气吸附-脱附等温曲线计算出产物的比表面积高达1 209m2/g,孔径分布在0.58～1.2nm之间.一系列对比实验表明,合成剪纸状碳材料的最佳条件为:0.093g二茂铁,反应温度为600℃,反应时间为10h.通过调整二茂铁与四氯乙烯的比例,可控制产物的形貌从剪纸状转化为空心球.剪纸状碳对于苯酚的吸附性能(82%)要远高于对罗丹明B的吸附性能(48%),并对其给出了可能的解释.

Decoupage-like carbon sheets（DLCSs） were obtained on a large scale by pyrolysis of tetrachloroethylene and ferrocene in an autoclave at 600 ℃ for 10 h.The scanning electron microscopy（SEM） images show that the thickness and the width of DLCSs are about 20~40 nm,100~200 nm,respectively.The nitrogen adsorption/desorption isotherm experiments reveal that the Brunauer-Emmett-Teller（BET） specific surface area of the product is 1 209 m2/g and the pore-size distribution is concentrated in the range of 0.58~1.2 nm.A series of comparative experimental results demonstrate that the most favorable temperature,amount of ferrocene and reaction time are 600 ℃,0.093 g and 10 h for synthesis of DLCSs.By adjusting reaction parameters,hollow carbon spheres and carbon sheets can also be selectively prepared using one-pot reactions.A possible formation mechanism for the DLCSs was proposed based on the diffusion-limited aggregation（DLA） model.The adsorption behavior of DLCSs were evaluated by the removal of phenol and Rhodamine B（RB）,which can remove about 82% of phenol and 48% of RB without any other additives.A possible reason for this phenomenon was also discussed.