论文部分内容阅读
采用印刻法制得煤沥青基中孔活性炭,并以硝酸为氧化剂对其进行了表面氧化改性,考察了硝酸浓度、氧化温度和氧化时间对活性炭孔隙结构和表面化学性质的影响。结果表明,活性炭的孔隙结构和表面含氧基团的浓度随氧化改性条件的变化而改变。在硝酸体积分数65%、氧化温度60℃、反应时间3h的最佳条件下,活性炭的平均孔径基本没有变化,比表面积和表面含氧基团的浓度大幅提高,活性炭的中孔率和收率也达到最大值。然而,过度的氧化改性导致了活性炭孔壁的严重坍塌,比表面积和表面含氧基团的浓度明显下降。
The coal pitch pitch-based mesoporous activated carbon was prepared by imprinting, and the surface was oxidized with nitric acid as oxidizing agent. The effects of nitric acid concentration, oxidation temperature and oxidation time on the pore structure and surface chemical properties of activated carbon were investigated. The results showed that the pore structure of activated carbon and the concentration of oxygen-containing groups on the surface of the activated carbon changed with the oxidative modification conditions. Under the optimal conditions of volume fraction of nitric acid 65%, oxidation temperature 60 ℃ and reaction time 3 h, the average pore diameter of activated carbon remained almost unchanged, and the specific surface area and the concentration of oxygen-containing groups on the surface were greatly increased. The mesopore and yield of activated carbon Also reached the maximum. However, excessive oxidative modification resulted in a serious collapse of the activated carbon pore walls, with a marked decrease in specific surface area and surface oxygen-containing groups.