粘胶基活性炭纤维湿氧化改性对甲苯吸附性能的影响

为了研究粘胶基活性炭纤维(ACFs)湿氧化改性对甲苯吸附性能的影响，采用实验室模拟的方法，研究了H₂O₂湿氧化改性ACFs结构性质和表面化学性质对甲苯吸附性能的影响.结果表明:相比原样，改性ACFs的微孔孔容和表面积等结构参数均有所增大，从而有利于吸附甲苯.不同浓度的改性ACFs样品具有相似的结构性质和不同的表面化学性质；随着H₂O₂浸渍浓度的提高，ACFs表面CO型含氧基团含量递减且有利于吸附甲苯；CO₂型含氧基团含量递增且不利于吸附甲苯；整体上，ACFs表面含氧基团(包括CO型和CO₂型基团)总量的增多不利于甲苯吸附.ACFs与甲苯分子之间π-π色散力作用是影响湿氧化改性后ACFs对甲苯吸附性能的关键因素. 

Role of Viscose Activated Carbon Fibers Modified with Wet Oxidant in Adsorption of Toluene

In order to study effect of viscose activated carbon fibers (ACFs) modified with wet oxidant, the influence of textural characteristics and surface chemistry of ACFs modified with wet oxidant of H₂O₂ in the adsorption of toluene were studied under laboratory tests. The experimental results indicated that compared with the original sample, the textural characteristics such as micro volumeof ACFs modified with different concentrations of H₂O₂ advanced and favoredthetoluene adsorption. ACFs modified with different concentrations were prepared to have similar textural characteristics but different surface chemistry. It was observed that with the increase of the impregnated concentration of H₂O₂, the amount of CO-evolving groups of ACFs was reduced gradually and favored the tolueneadsorption, however, the amount of CO₂-evolving groups was increased gradually and was detrimental for toluene adsorption. In general, the total number of oxygen surface groups (i.e., both CO and CO₂-type groups) was high, but the toluene adsorption capacity was low. The results confirmed that π-π dispersion force between ACFs and toluene molecule was the key factor for toluene adsorption on ACFs modified with wet oxidant.