Effects of pretreatment on the surface chemistry and pore size properties of nitrogen functionalized and alkylated granular activated carbon

化学 X射线光电子能谱 傅里叶变换红外光谱 氮气 微型多孔材料 核化学 碳纤维 甲醛 比表面积 烷基化 表面改性 活性炭 有机化学 吸附 化学工程 材料科学 复合数 物理化学 催化作用 复合材料 工程类
作者
Jiajun Chen,Yunbo Zhai,Hongmei Chen,Caiting Li,Guangming Zeng,Daoxiong Pang,Pei Lu
出处
期刊:Applied Surface Science [Elsevier BV]
卷期号:263: 247-253 被引量:17
标识
DOI:10.1016/j.apsusc.2012.09.038
摘要

In this paper, granular activated carbon (GAC) from coconut shell was pretreated by HNO3, H2O2 and urea-formaldehyde resin, respectively. Then the obtained materials were functionalized in the same way for nitrogen group, and then alkylated. Effects of pretreatment on the surface chemistry and pore size of modified GACs were studied. Surface area and micropore volume of modified GAC which pretreated by HNO3 were 723.88 m2/g and 0.229 cm3/g, respectively, while virgin GAC were 742.34 m2/g and 0.276 cm3/g. Surface area and micropore volume decrease of the modified GACs which pretreated by the others two methods were more drastically. The types of groups presented were analyzed by electrophoresis, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). NCH3 group and CN group were detected on the surfaces of these three kinds of modified GACs. Results of XPS showed that the nitrogen functions of modified GAC which pretreated by H2O2 was 4.07%, it was more than that of the others two pretreatment methods. However, the modified GAC which pretreated by urea-formaldehyde resin was fixed more pyridine structure, which structure percentage was 45.88%, in addition, there were more basic groups or charge on the surface than the others.
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