摘要
采用振荡平衡法,对供试土壤吸附TNT过程进行了研究,探讨了土壤对TNT吸附的动力学特征及吸附-解吸特征。结果表明,TNT在供试土壤上的吸附在8 h基本达到平衡,并且准二级动力学模型能够很好地描述其对TNT的吸附;Freundlich模型能够很好的拟合土壤对TNT的吸附-解吸等温曲线,并且吸附为非线性吸附;吸附过程中吉布斯自由能为-17.53 k J/mol,其绝对值小于40 k J/mol,说明土壤对TNT的吸附以物理吸附为主,吸附机制主要为范德华力、疏水作用、偶极作用力以及氢键作用。
The batch experiments were conducted for the TNT adsorption on the soil. The adsorption process was analyzed,and the characteristics of adsorption dynamics and adsorption-desorption isotherm were explored. The results showed that the TNT adsorption equilibrium on the soil was reached after 8h,and the adsorption could be described well by Pseudo-second order adsorption dynamics. Freundlich model could fit the adsorption-desorption isothermal curve,and the adsorption was non-linear.The Gibbs free energy of the adsorption process was-17. 53 k J / mol,and the absolute value was less than 40 k J / mol,indicating the TNT adsorption process on the soil was mainly physical adsorption. The mechanisms of adsorption were mainly Van Der Waals forces,hydrophobic interactions,dipole forces and hydrogen bonds.
出处
《四川环境》
2015年第2期14-19,共6页
Sichuan Environment
基金
总后勤部基建营房部科研项目(CY112C017)
浙江省固体废物处理与资源化重点实验室开放课题(SWTR-2012-04)
解放军后勤工程学院学术创新科研项目(YZ11-43301)
关键词
土壤
TNT
吸附-解吸
吸附动力学
Soil
TNT
adsorption-desorption isotherm
adsorption dynamics
