【摘要】 采用静态与动态实验相结合的方法,研究了2,4-二氯苯酚在黄土性土壤中的吸附和解吸规律,测定吸附动力学和吸附热力学曲线,获得吸附热力学模型。研究表明,2,4-二氯苯酚在黄土性土壤中吸附等温线可用Freundlich和Langmuir方程描述,其中q0描述饱和吸附量,由Langmuir吸附等温式拟合数据可以看出:TS-2土的饱和吸附量大于TM-1土(这是因为2,4-二氯苯酚在土壤中的吸附量与土壤中有机质的含量密切相关);由Freundlich吸附等温式拟合得到的常数,1/n均<1,证明是优惠吸附;根据吸附符合Langmuir方程,说明在土壤表面,2,4-二氯苯酚为单分子层吸附;吸附-解吸具有一定的可逆性,黄土性土壤对2,4-二氯苯酚的吸附能力不强,2,4-二氯苯酚极易穿透土壤,污染地下水。更多还原

【Abstract】 Studied the law of adsorption and desorption of 2,4-dichlorophenol in the loess soil,its curve of adsorption kinetics and thermodynamics and the adsorption thermodynamic model used by the combination of static and dynamic method. The study showed that the adsorption isotherm of 2,4-dichlorophenol in loess soil can be depicted with Freundlich equation and Langmuir equation,q0 describes adsorption capacity between these figures,from the Langmuir adsorption isotherm fitting data can be seen: TS-2 soil saturated adsorption quantity of soil is greater than the TM-1( this is because 2,4-dichlorophenol adsorption in the soil is closely related to the content of organic matter in soil). Freundlich isotherm and Langmuir both could be better describe the 2,4-dichlorophenol adsorption behavior of the soil. From the Freundlich isotherm fitting constants obtained can be seen,1 /n is less than 1 indicating preferential adsorption. If it meets the adsorption of Langmuir equation,it means that 2,4-dichlorophenol adsorption on the soil surface is a single molecular layer. Adsorption and desorption have a quantity of certain reversibility. The Loess soil does not has a function for the enrichment of 2,4-dichlorophenol,and the 2,4-dichlorophenol can penetrate the loess soil very easily. Inevitably,the groundwater will be contaminated by the 2,4-dichlorophenol.更多还原