ZIF-8基多孔碳的制备及吸附性能

doi:10.16085/j.issn.1000-6613.2017.01.038

摘要/Abstract

摘要： 氮气氛围中煅烧ZIF-8，对煅烧后样品采用XRD、FESEM、BET、HRTEM等进行表征，并通过对亚甲基蓝的脱除来测试其吸附和光催化性能。结果表明，煅烧温度低于500℃时，碳化样品保持了ZIF-8的结构及形貌。温度达到600℃时，ZIF-8开始分解碳化，结构中的Zn转变成ZnO，形成ZnO@C复合物，但其光催化活性较低，这是由于ZnO被C包裹减少了与亚甲基蓝分子接触概率。随着温度的进一步升高，ZIF-8碳化成为具有石墨相结构的多孔碳。煅烧的温度越高，颗粒的团聚越明显，纳米级颗粒聚结形成明显的的块状物；碳化样品的比表面积越高，介孔和大孔所占比例也越大。亚甲基蓝的脱除实验显示，随着碳化温度的增加，碳化样品的脱除效果显著提高，1000℃碳化所形成多孔碳的脱除效果优于市售的活性炭，主要与高的表面积及多的介孔及大孔相关。

关键词: ZIF-8, 热解, 多孔碳, 制备, 亚甲基蓝, 吸附

Abstract: ZIF-8 was calcined in nitrogen,and the calcined samples were characterized by XRD,FESEM,BET,and HRTEM. The adsorption and photocatalytic properties of the calcined samples were tested through the removal of methylene blue. The results showed that the structure and morphology of ZIF-8 were maintained when the calcination temperature was less than 500℃. When the temperature reached 600℃,ZIF-8 began to decompose,the Zn in the structure changed to ZnO,and the complex ZnO@C was formed. Unfortunately,the photocatalytic activity of ZnO@C was not high,because the formed ZnO was covered by C,which reduced tits contact with methylene blue molecules. With the further increase of the temperature,porous carbon of graphite structure was formed. The higher the calcination temperature,the more the particles' agglomeration and blocks of large particle size were formed by the aggregation of nano-sized particles. The increase of calcination temperature also led to the increases of specific surface area and the number of mesoporous and large pores of the calcined samples. The methylene blue removal experiments showed that the removal efficiency was significantly increased with the increase of carbonization temperature. The removal efficiency of porous carbon formed by carbonization at 1000℃ was better than that of commercial activated carbon,which is mainly because the former had the surface area and larger pore size.

Key words: ZIF-8, pyrolysis, porous carbon, preparation, methylene blue, adsorption

中图分类号:

O643

王春宇, 张晶, 张青云, 徐炳乾, 杜艳. ZIF-8基多孔碳的制备及吸附性能[J]. 化工进展, 2017, 36(01): 299-304.

WANG Chunyu, ZHANG Jing, ZHANG Qingyun, XU Bingqian, DU Yan. Preparation and adsorption properties of ZIF-8 based porous carbon[J]. Chemical Industry and Engineering Progree, 2017, 36(01): 299-304.

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