采用3种不同的氧化改性方法对MSC-30活性炭进行了氧化改性。结果表明，随着氧化程度逐渐加深，活性炭的比表面积（微孔孔容）逐渐降低，而表面含氧基团却逐渐增加。深度氧化有利于羧基的形成。对于单组份氮杂环化合物喹啉、吲哚和咔唑的吸附，原始活性炭对咔唑的吸附量最高，可达到1．104mmol／g。氧化后的活性炭样品保持对咔唑的吸附量，同时显著提高对喹啉和吲哚的吸附量。其中，对喹啉和吲哚的最高吸附量分别达到1．157和1．024mmol／g。活性炭对含3组分氮的模型油的吸附结果进一步表明3种氧化改性方法均提高了活性炭的吸氮量，尤其有利于碱性氮化物的吸附。
To improve the adsorption performance of activated carbon （AC） for denitrogenation oi liquid hydro- carbon fuels, a commercial AC was modified in this present study using concentrated H2SO4, saturated （NH4） 2 S2O8 solution and mixture of the two oxidants, respectively. It was seen that, as the specific surface area （micropore volume） of activated carbon decreased gradually with the increase of oxidation degree, the amount of surface oxygen-containing groups increased. Severely oxidization was beneficial to the formation of carboxylic group. On the adsorption capacities for single nitrogen containing compounds, the original activated carbon dis- played the highest adsorptive capacity for carbazole in quinoline, indole and carbazole, which could reach 1. 104 mmol/g. Activated carbons after oxidization maintained the adsorptive capacity for carbazole and meanwhile no- ticeably increased the adsorption capacity for quinoline and indole. Among them, the highest adsorptive capacity for quinoline and indole could reach 1. 157 and 1. 024mmol/g, respectively. The adsorption capacities of activa- ted carbons for triple nitrogen-containing compounds further illustrated that these three oxidative modification methods could enhance the adsorptive capacity for nitrogen compounds, especially for basic nitrogen compound quinoline.
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