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.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
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)
