微纳米多孔碳质材料的表面修饰及苯酚吸附性能

Surface Modification of Micro-Nano Porous Carbon Material and its Phenol Adsorption Property

采用不同修饰工艺对微纳米多孔碳质材料进行处理,考察了修饰前后材料表面官能团的变化及其对苯酚吸附能力的影响,并结合Boehm滴定、Fourier变换红外光谱仪和X射线光电子能谱对材料表面官能团进行表征。结果表明:经高温(800℃)和尿素修饰后,材料的比表面积分别下降了41.9%和19.6%,苯酚吸附性能分别提升了21.2%和37%;经硝酸预改性的样品表面存在大量的羧基和酚羟基酸性基团,尿素改性时更利于吡啶和吡咯结构的生成。

A micro-nano porous carbon material（MNC） was modified by different methods.The effect of surface functional groups on the phenol adsorption capacity was investigated by the Boehm titration,Fourier transform infrared spectroscopy and X-ray photo-electron spectroscopy,respectively.The results show that after heat treatment at a high temperature（800 ℃） and urea modification,the specific surface areas of the MNC are decreased by 41.9% and 19.6%,respectively,and the phenol adsorption capacities are in-creased by 21.2% and 37%,respectively.For the modification by nitric acid followed by urea,the presence of acidic groups（particu-larly for carboxyl and phenolic hydroxyl groups） improved the surface defects of graphite microcrystalline,which could favor the implant of nitrogen-containing functional groups,especially for the generation of pyridine and pyrrole.