3,5,6-三氯-2-吡啶醇在紫色土中的吸附特征与参数估计

发布时间：2018-04-18 19:36

  本文选题：-三氯--吡啶醇 + 紫色土　； 参考：《农业机械学报》2017年05期

【摘要】：通过批量平衡实验和土柱实验获得了3,5,6-三氯-2-吡啶醇(简称TCP)在紫色土土壤中的吸附特征,并应用模型对上述吸附过程进行模拟。其中,吸附动力学参数通过准一阶、准二阶动力学方程、Elovich模型和粒子扩散模型反演;等温吸附参数应用Freundlic、Langmuir和Linear模型反演;土柱实验中的吸附参数基于Thomas与YoonNelson模型反演。结果表明:TCP在紫色土中的吸附动力学过程包含快速的表面物理吸附和慢速的内部化学扩散2个阶段,且粒子扩散模型表现最好。等温吸附过程可以通过Freundlic模型描述(R~2=0.94),获得的吸附容量常数K_f为0.79 mL/g,吸附水平较小说明TCP在紫色土中具有较大的迁移风险。TCP在土柱中达到平衡需要的时间约为1 215 min,土壤对TCP的吸附率为10.65%。Thomas与Yoon-Nelson模型能够较好地模拟TCP在紫色土中的动态吸附曲线(R~2≥0.84),获得的平衡浓度q0为0.008 6 mg/g。
[Abstract]:The adsorption characteristics of TCPs in purple soil were obtained by batch equilibrium experiment and soil column experiment. The adsorption process was simulated by using the model.Among them, the adsorption kinetic parameters are inversed by Elovich model and particle diffusion model by quasi-first-order and quasi-second-order kinetic equations, the isothermal adsorption parameters are inversed by Freundlic-Langmuir and Linear models, and the adsorption parameters in soil column experiments are inversion based on Thomas and YoonNelson models.The results show that the adsorption kinetic process of 1: TCP in purple soil consists of two stages: fast surface physical adsorption and slow internal chemical diffusion, and the particle diffusion model is the best.The isothermal adsorption process can be described by Freundlic model. The adsorption capacity constant K _ p _ f is 0.79 mL / g. The smaller adsorption level indicates that TCP has a large migration risk in purple soil. The time required for TCP to achieve equilibrium in soil column is about 1 215.The adsorption rate of TCP on soil was 10.65%.Thomas and Yoon-Nelson model, which could simulate the dynamic adsorption curve of TCP in purple soil. The equilibrium concentration Q _ 0 was 0.008 mg / g 路m ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1).
【作者单位】： 四川大学建筑与环境学院;四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：中国博士后科学基金项目(2016M592671)
【分类号】：O647.3;TQ450.262
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