活性炭低温氧/氮等离子体表面改性的研究  

Surface Modification of Activated Carbon by Low Temperature Oxygen/Nitrogen Plasma

作　　者：解强[1] 李兰亭[1] 李静[2] 张香兰[1] 张军[1] 

机构地区：[1]中国矿业大学化学与环境工程学院,北京100083 [2]防化研究院,北京100083

出　　处：《中国矿业大学学报》2005年第6期688-693,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50204011)

摘　　要：利用低温氧、氮等离子体将商品活性炭进行表面改性,采用傅立叶变换红外光谱(FT IR)和电位滴定法分析、测定改性前后活性炭表面官能团的种类与数量.结果表明,同功率下P-O2改性时活性炭烧失率远比P-N2改性的高;在P-O2改性过程中,活性炭烧失率随等离子体发生功率的增大而升高,而在P-N2改性过程中,活性炭烧失率随着等离子体发生功率的变化有一峰值,该峰值在低功率范围内随功率的增大而增大,在高功率范围内随功率的进一步增大反而降低.活性炭经P-O2改性在炭表面上引入了大量的含氧官能团,经P-N2改性的活性炭随着活性炭表面改性强度的提高,表面含氧酸性官能团逐渐减少,含氮官能团逐渐增加,获得了富含硝基、胺基和酰胺基的活性炭.A commercial coal-based activated carbon was modified by low temperature oxygen plasma （P-O2） and nitrogen plasma （P-N2）, respectively. Fourier Transform Infrared （FTIR） and electric titration were exploited to determine the changes in surface chemistry of activated carbon. The results show that the burn-off of activated carbon in P-O2 modification is higher than that in P- N2 modification at the same plasma strength. Meanwhile, the burn-off of activated carbon always increases with the increase of plasma strength in P-O2 modification, but the burn-off of activated carbon has an obviously peak in the case of P-N2 modification. Treatment of activated carbon by oxygen plasma results in the introduction of oxygen-containing functional groups, while modification of activated carbon by nitrogen plasma diminishes acidic oxygen-containing functional groups and enhances the nitrogen-containing functional groups, by which an activated carbon rich in nitryl, amidocyanogen and imide suitable for water treatment and flue gas purification can be prepared.

关 键 词：活性炭 改性 氧等离子体 氮等离子体 FTIR-电位滴定 

分 类 号：TQ53[化学工程—煤化学工程]