發(fā)布時間：2018-04-18 19:36

  本文選題：-三氯--吡啶醇 + 紫色土　； 參考：《農(nóng)業(yè)機械學(xué)報》2017年05期

【摘要】：通過批量平衡實驗和土柱實驗獲得了3,5,6-三氯-2-吡啶醇(簡稱TCP)在紫色土土壤中的吸附特征,并應(yīng)用模型對上述吸附過程進行模擬。其中,吸附動力學(xué)參數(shù)通過準(zhǔn)一階、準(zhǔn)二階動力學(xué)方程、Elovich模型和粒子擴散模型反演;等溫吸附參數(shù)應(yīng)用Freundlic、Langmuir和Linear模型反演;土柱實驗中的吸附參數(shù)基于Thomas與YoonNelson模型反演。結(jié)果表明:TCP在紫色土中的吸附動力學(xué)過程包含快速的表面物理吸附和慢速的內(nèi)部化學(xué)擴散2個階段,且粒子擴散模型表現(xiàn)最好。等溫吸附過程可以通過Freundlic模型描述(R~2=0.94),獲得的吸附容量常數(shù)K_f為0.79 mL/g,吸附水平較小說明TCP在紫色土中具有較大的遷移風(fēng)險。TCP在土柱中達到平衡需要的時間約為1 215 min,土壤對TCP的吸附率為10.65%。Thomas與Yoon-Nelson模型能夠較好地模擬TCP在紫色土中的動態(tài)吸附曲線(R~2≥0.84),獲得的平衡濃度q0為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).
【作者單位】： 四川大學(xué)建筑與環(huán)境學(xué)院;四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護國家重點實驗室;
【基金】：中國博士后科學(xué)基金項目(2016M592671)
【分類號】：O647.3;TQ450.262
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本文編號：1769774