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中文摘要：
引言 燃油燃烧产生大量的废气，特别是SO2的排放，严重污染环境，为此，各个国家制定严格法规限制燃油中的硫含量。欧美等国相继要求，到2008年汽油和柴油中的硫含量降至10μg·g^-1。因此，生产超净燃油和“零硫”燃油已成为全球炼油企业和石化行业面临的技术挑战。目前我国汽油硫含量为800μg·g^-1，柴油硫含量更高为2000μg·g^-1，远远高于欧美国家的标准。为满足环保要求和提高我国油品的国际竞争力，国家规定到2010年，油品的硫含量全面与国际接轨。这对于国内的石化企业是一个重大挑战。用于燃油脱硫的技术很多，传统的加氢脱硫技术能脱除燃油中大部分硫化物，但对于噻吩类硫化物，特别是多环有机硫的脱除效果不佳。吸附脱硫由于具有成本低、操作简单、操作条件缓和、适宜深度脱硫等优点，受到越来越多的关注。
英文摘要：
The effect of thermal oxidation of activated carbon surface on its adsorption of dibenzothiophene was investigated. The surface oxidation of the activated carbon was carried out by heating at different temperatures in the air. Static equilibrium adsorption experiments were conducted to determine the isotherms of dibenzothiophene on the original and oxidized activated carbons. The type and concen;tration of oxygen functional groups on the activated carbons were determined by diffuse reflectance infrared Fourier transform spectroscopy （DRIFTS） and Boehm titration respectively. The influence of the surface chemistry of the activated carbons on the adsorption capacity for dibenzothiophene was discussed. The results showed that the acid oxygen-containing groups of the activated carbon surfaces played an important role in enhancing the adsorption of dibenzothiophene. It was shown that the use of thermal oxidation could increase the concentration of oxygencontaining groups on the activated carbon surfaces, and consequently increase its adsorption capacity for dibenzothiophene. It was also found that the higher the oxidation temperature, the more the oxygen- containing groups on activated carbon surface, which enhanced the adsorption capacity of dibenzothiophene on its surfaces. The Langmuir equation was shown to fit well these isotherms.
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