N-LED3A在土壤中的吸附特征及其影响因素
发布时间:2018-07-07 11:01
本文选题:螯合型表面活性剂 + 吸附 ; 参考:《中国环境科学》2017年04期
【摘要】:采用批平衡试验法,研究了新型螯合型表面活性剂N-十二酰基乙二胺三乙酸钠(N-LED3A)在土壤上的吸附特征,并探讨了pH值、温度、离子强度和水土比对N-LED3A在土壤上的吸附影响.结果表明:准二级动力学方程适合描述N-LED3A在土壤上的吸附过程.Langmuir、Freundlich和Dubinin-Radushkevich(D-R)吸附等温方程均可较好地用于拟合吸附行为.土壤有机质和粘土矿物对N-LED3A在土壤上的吸附起到重要作用.溶液pH值对N-LED3A在土壤上的吸附有显著影响,随pH值增大(5~11),N-LED3A在土壤上的吸附量明显减小.N-LED3A浓度低于1000mg/L时,升高温度(25,35,45℃)对吸附量影响不大,但当浓度大于3000mg/LT,吸附量随温度的升高有所_低.N-LED3A在土壤上的吸附量随离子强度增大而增加.N-LED3A吸附量随水土比变化顺序为:水土(20:1)水土(40:1)水土(80:1).
[Abstract]:The adsorption characteristics of a new chelating surfactant N-dodecyl ethylenediamine triacetate (N-LED3A) on soil were studied by batch equilibrium test. The effects of pH, temperature, ionic strength and water / soil ratio on the adsorption of N-LED3A on soil were discussed. The results showed that the quasi-second-order kinetic equation was suitable to describe the adsorption process of N-LED3A on soil. The adsorption isotherm equations of Dubinin-Radushkevich (D-R) and Langmuir-Freundlich (D-R) could be used to fit the adsorption behavior. Soil organic matter and clay minerals play an important role in N-LED 3A adsorption on soil. The pH value of the solution had a significant effect on the adsorption of N-LED3A on soil. With the increase of pH value, the adsorption capacity of N-LED3A on soil decreased significantly. When the concentration of N-LED3A was lower than 1000 mg / L, the increase of temperature (25 鈩,
本文编号:2104761
本文链接:https://www.wllwen.com/shengtaihuanjingbaohulunwen/2104761.html