活性炭低温氧/氮等离子体表面改性的研究

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（FTIR）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.

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

A commercial coal-based activated carbon was modified by low temperature oxygen plasma(P-O_2) and nitrogen plasma(P-N_2),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-O_2 modification is higher than that in P-N_2 modification at the same plasma strength.Meanwhile,the burn-off of activated carbon always increases with the increase of plasma strength in P-O_2 modification,but the burn-off of activated carbon has an obviously peak in the case of P-N_2 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.