Study on adsorption and desorption behavior of toluene by peat
泥炭对甲苯的吸附-解吸行为研究

The peat was modified by heat treatment.The properties and main influential factors of modified peat for adsorption of toluene in the solutions were experimentally investigated.The results showed that the adsorption ability for toluene was greatly improved under the conditions that heat treatment temperature was 160℃,time was 5 h,size was 0.6~1 mm,pH was 7.The adsorption rate of toluene was 0.32 mg/g.The adsorption of toluene by peat could reach balance at 20 min.It was fit for the secondary absorption rate equation.All the sorption and desorption isotherms of toluene on the peat were nonlinear,which can be well fitted by Langmuir model.The saturate adsorption capacity of toluene by peat was 0.939 mg/g.The average desorption rate of toluene on peat was 6.393%.Desorption hysteresis of toluene on peat was evident which showed that peat had a strong binding capacity with toluene.It provides a theoretical foundation for using peat as new PRB filling material to in situ remediate BTEX contaminated groundwater using absorption-degeading method.