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考察了不同结构的活性炭样品对高浓度和低浓度甲苯蒸汽的吸附行为,采用低温(77K)氮气吸附和129Xe-核磁共振方法对所用活性炭的结构进行了表征。并将活性炭对甲苯的吸附性能与其结构进行了关联。结果表明:孔容积大的活性炭对高浓度甲苯蒸汽吸附容量大,而具有丰富微孔和较小平均孔径的活性炭对低浓度(2×10-5)甲苯蒸汽具有高的吸附容量。沥青基活性炭纤维对低浓度(2×10-5)甲苯蒸汽表现出较好的吸附能力。随着比表面积的增大,活性炭纤维对低浓度(2×10-5)甲苯蒸汽的吸附容量略有增加。OG5A,OG10A,OG15A和OG20A在30℃下对2×10-5甲苯蒸汽的饱和吸附容量分别为:202mg/g,219mg/g,221mg/g和235mg/g。
The adsorption behavior of high-concentration and low-concentration toluene vapor of activated carbon samples with different structures was investigated. The structure of activated carbon was characterized by low temperature (77K) nitrogen adsorption and 129Xe-NMR. The adsorption capacity of toluene on activated carbon was related to its structure. The results show that activated carbon with large pore volume has high adsorption capacity for high concentration toluene vapor while activated carbon with rich micropores and small average pore size has high adsorption capacity for low concentration (2 × 10-5) toluene vapor. Pitch-based activated carbon fibers show good adsorption capacity for low concentration (2 × 10-5) toluene vapor. With the increase of specific surface area, the adsorption capacity of activated carbon fiber to low concentration (2 × 10-5) toluene vapor increased slightly. The saturated adsorption capacity of OG5A, OG10A, OG15A and OG20A to 2 x 10-5 toluene vapor at 30 ° C was 202 mg / g, 219 mg / g, 221 mg / g and 235 mg / g, respectively.