• 关键词：单质汞吸附  活性炭纤维  改性处理  孔结构  表面官能团

• 基金项目：国家自然科学基金(No.50608065);国家高技术研究发展计划(863)项目(No.2005AA520080)

• 任建莉
• 浙江工业大学机械工程学院, 杭州 310014

• 叶素娟
• 浙江工业大学机械工程学院, 杭州 310014

• 陈俊杰
• 浙江工业大学机械工程学院, 杭州 310014

• 平传娟
• 浙江工业大学机械工程学院, 杭州 310014

• 周劲松
• 浙江大学能源清洁利用国家重点实验室, 杭州 310027

• 摘要：选用了3种比表面积不同的粘胶基活性炭纤维(ACF-1、ACF-2和ACF-3),并对样品ACF-1进行了浓硝酸和氨水活化处理,获得样品ACF-N和ACF-NH₃,最后对这5种ACF样品进行表面特性表征和单质汞的吸附实验.氮分子吸附(77.4K)实验结果表明,ACF-N和ACF-NH₃的微孔容积与ACF-1相比有所减小,各样品的微孔(d<2nm)分布有一定差异.ACF含有许多不规则的表面微结构,其X射线光电子能谱(XPS)分析表明,ACF-N的含氧官能团(CO、COOH)和ACF-NH₃的含氮官能团含量与ACF-1相比均有明显增加.X射线衍射(XRD)分析结果表明,ACF-2和ACF-3的石墨化程度和晶体化程度较ACF-1有所提高.汞吸附实验表明,由于受到ACF表面微结构的影响,微孔容积与吸附能力之间并非简单的依附关系,增加含氧、含氮基团含量在一定程度上能提高ACF的汞吸附容量.

• Abstract：Three different specific surface area viscose-ACF (defined as ACF-1、ACF-2 and ACF-3) were chosen in the tests. The resulting materials ACF-Nand ACF-NH₃ were obtained after the sample ACF-1 was treated with HNO₃ acid digestion and ammonia solution. Then the characterization of surface properties and Hg adsorption tests were conducted for these five kinds of ACFs. The nitrogen adsorption test at temperature 77.4Kshowed that micro-pore distribution (d<2nm) of five samples existed differences. Micro-pore volume of ACF-Nand ACF-NH₃ samples were smaller than that of ACF-1. Surface micro-structure was analyzed by X-ray photoelectron spectroscopy (XPS). The results showed that oxygen functional groups such as carbonyl and carboxyl in ACF-Nand nitrogen-containing functional groups in ACF-NH₃ are significantly more than that in ACF-1. Microcrystalline structure was analyzed by X-ray diffraction (XRD) technique. It was found that graphitization and crystal level of ACF-2 and ACF-3 also increased comparing with ACF-1. Mercury removal tests revealed that mercury adsorption capacity does not simply depend on micro-pore volume because of the effect of surface micro-structure. Increasing the content of oxygen and nitrogen-containing functional groups,to some extent,can enhance mercury removal performance of ACF.

• Key words：elemental mercury adsorption  activated carbon fiber  modification  pore structure  surface functional group

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