中文摘要：

以十六烷基三甲基溴化铵（CTMAB）微波改性膨润土（CTMAB-膨润土）作为吸附剂。在初始浓度为50-100mg/L,温度为288-308K时,研究了CTMAB-膨润土对PFOS的吸附热力学和动力学规律。结果表明,吸附反应2h后,CTMAB-膨润土对PFOS吸附量达到平衡吸附量的80%,随后吸附速率逐渐变缓并在吸附反应进行约4h后达到平衡;PFOS在CTMAB-膨润土上的吸附过程符合伪二级动力学方程和Langmuir等温吸附模型。通过热力学分析发现△H0〉0、△G0〈0、△S0〉0、Ea=26.7k J/mol,表明PFOS在CTMAB-膨润土上的吸附属于易于自发进行的物理吸附过程,吸附过程吸热,但吸附热较小,温度对吸附过程的影响较小。吸附饱和的CTMAB-膨润土可在Na OH溶液中脱附再生,经4次脱附后,PFOS的吸附量为140.6mg/g,具有良好的再生使用性,可以循环使用。

英文摘要：

Bentonites modified by cetyltrimethyl ammonium bromide （CTMAB-bentonite） was used as adsorbent. The adsorption thermodynamics and kinetics of PFOS on CTMAB-bentonite were investigated within an initial concentration range of 50-100mg/L, an experimental temperature range of 288-308K. The results revealed that the PFOS adsorption capacity could account for 80% of equilibrium adsorption capacity after the reaction occurred 2h. After that, the adsorption rate became slower and the adsorption reaction reached equilibrium at 4h. The adsorption process could be well described by the Pseudo-second-order kinetics equation and the Langmuir isotherm adsorption model. Thermodynamic analysis suggested △H0〉0, △G0〈0, △S0〉0, and Ea=26.7kJ/mol. The adsorption of PFOS on CTMAB-bentonite was a spontaneous physical adsorption process, and AH of adsorption was so small that the temperature had little influence on adsorption process. The loaded CTMAB-bentonite could he desorbed in NaOH solution, and the amount of PFOS was about 140.6mg/g after fourth desorption-regeneration cycles, which indicates that the adsorbent can be used repeatedly.