林产化学与工业2017，Vol.37Issue(2)：35-41,7.DOI:10.3969/j.issn.0253-2417-2017-02-004
氨气改性活性炭表面含氮官能团的形成与演变
Formation and Evolution of Surface Nitrogen Functionalities on Activated Carbons by Ammonia Modification
摘要
Abstract
Three types of ammonia modification was carried out in 300-1 000 ℃ using nitric acid oxidized activated carbon obtained commercially from steam activation using coconut shell as raw materials.The formation and evolution of surface nitrogen functional groups of the activated carbon were investigated.Element analysis, Boehm titration and X-ray photoelectric spectroscopy (XPS) were employed to determine the element contents, acid and basic functional groups contents and the types of nitrogen-containing functional groups of activated carbons.The results showed that when the activated carbon were treated at the temperature below 700 ℃, nitrogen functional groups were mostly nitrogen oxides(N-X, such as amides, imides and lactams) generated mainly by combining ammonia and surface oxygen-containing functional groups, and some pyridinic(N-6) and pyrrolic(N-5) groups by the reaction of ammonia and carbon atoms in the carbon matrix.when the temperature increased to 800 ℃, the formation of nitrogen functional groups were contributed to the combination of ammonia and carbon atoms and pyridinic, pyrrolic and quaternary(N-Q) groups were predominantly generated.With the temperature increasing, amides, lactams and imides were progressively converted into pyridinic, pyrrolic groups and eventually into quaternary groups.Besides, there was no quaternary surface group below 800 ℃.关键词
活性炭/氨气改性/含氮官能团/演变Key words
activated carbon/ammonia modification/nitrogen functional groups/evolution分类
化学化工引用本文复制引用
张文彬,左宋林,王宜望..氨气改性活性炭表面含氮官能团的形成与演变[J].林产化学与工业,2017,37(2):35-41,7.基金项目
国家自然科学基金资助项目(31270621) （31270621）
江苏高校品牌专业建设工程项目(PPZY2015C221) （PPZY2015C221）
