粘胶基活性炭纤维湿氧化改性对甲苯吸附性能的影响  

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

作　　者：张登峰[1] 曾向东[1] 鹿雯[1] 杨丽莉[1] 王盼盼[1] 高志飞[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650093

出　　处：《环境科学研究》2008年第2期130-135,共6页Research of Environmental Sciences

基　　金：云南省自然科学基金资助项目(2004B0012M)

摘　　要：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.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 volume of ACFs modified with different concentrations of H2 O2 advanced and favored the toluene 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 toluene adsorption, 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.

关 键 词：粘胶基活性炭纤维 湿氧化 甲苯 表面化学性质 π-π色散力 

分 类 号：X701[环境科学与工程—环境工程]