摘要
采用静态吸附实验,对供试土壤吸附2,6-二硝基甲苯(2,6-DNT)的过程进行了研究,探讨了土壤对2,6-DNT吸附的动力学及热力学特征,并研究了溶液p H、土壤投加量对吸附的影响。结果表明:2,6-DNT在供试土壤上的吸附在24 h达到平衡,吸附过程符合拟二级动力学模型;Freundlich模型能够很好的拟合土壤对2,6-DNT的吸附等温曲线;热力学计算结果表明供试土壤对2,6-DNT的吸附反应是自发和吸热过程;p H对吸附过程影响不大,随着土壤投加量的增加,2,6-DNT去除率不断提高,单位土壤的平衡吸附量不断降低并且逐渐趋于平缓。
A static adsorption test was conducted to investigate the 2,6-DNT adsorption properties of soil by studying its kinetic and thermodynamic characteristics. The effects of p H and soil dosage on 2,6-DNT adsorption were also investigated. The results showed that the adsorption of 2,6-DNT by soil reached equilibrium after 24 h;the adsorption could be described well by pseudo-second order kinetics. The Freundlich model fit the adsorption isothermal curve. The thermodynamic analytical results showed that the adsorption was spontaneous and endothermic. p H had little effect on the adsorption process. As the soil dosage increased,the removal efficiency of 2,6-DNT increased,while the equilibrium absorption capacity decreased.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第4期2542-2547,共6页
Chinese Journal of Environmental Engineering
基金
北京市科技计划项目(Z151100000915065)
