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通过等温吸附实验,考察了三氯乙酸(TCAA)与十二烷基苯磺酸钠(DBS)、腐殖酸(HA)在活性炭(GAC)上的竞争吸附现象。结果表明,GAC对TCAA的吸附符合Langmuir模型,对DBS和HA的吸附均符合Freudlich模型;在GAC上,DBS和HA对TCAA构成竞争吸附,大分子HA阻塞GAC的微孔,使得TCAA与DBS难以进入微孔;GAC对3种物质的吸附能力由大到小依次为DBS、TCAA和HA;离子型表面活性剂DBS憎水性一端与TCAA竞争吸附位,亲水性一端与TCAA形成吸附,使GAC总饱和吸附量有所加大。
By isothermal adsorption experiments, the competitive adsorption of trichloroacetic acid (TCAA) with sodium dodecyl benzene sulfonate (DBS) and humic acid (HA) on activated carbon (GAC) was investigated. The results showed that the adsorption of TCAA by GAC conformed to the Langmuir model and the adsorption of DBS and HA were in accord with the Freudlich model. At GAC, DBS and HA competed for the adsorption of TCAA and the macromolecule HA blocked the pores of GAC, making TCAA and DBS difficult The adsorption capacity of GAC to DBT, TCAA and HA in descending order was as follows: the hydrophobic end of DBS of ionic surfactant competed with TCAA for adsorption and the hydrophilic end formed adsorption with TCAA, Total saturated adsorption has increased.