凹土对酞酸酯在土壤中吸附解吸的影响

发布时间：2018-06-01 01:27

本文选题：凹土 + 酞酸酯　；参考：《江苏农业学报》2016年06期

【摘要】：酞酸酯(Phthalic acid esters,PAEs)是水体、农田土壤等环境介质中广泛存在的一类有机污染物。利用批平衡吸附法和连续解吸法研究邻苯二甲酸正丁酯(Dibutyl phthalate,DBP)和邻苯二甲酸(2-乙基)己基酯[Di-(2-ethylhexyl)phthalate,DEHP]在不同凹土含量土壤中的吸附-解吸行为。结果表明,用Freundlich方程与Langumir方程均能较好地拟合DBP和DEHP在不同凹土含量土壤中的吸附行为,其R2均大于0.92。在Freundlich模型中DBP和DEHP在凹土含量1.0%、5.0%、10.0%的3种土壤中lg Kf值分别为1.510 3、1.405 0、1.216 6和3.170 4、3.084 8、3.034 0。在Langumir模型中Qm值变化与lg Kf值变化的趋势相同,同时非线性逐步减弱,说明凹土的加入降低了土壤对DBP和DEHP的吸附强度与吸附容量。DBP和DEHP在不同凹土含量3种土壤中的lg Koc值与其在Freundlich模型中的lg Kf值之间有较强的正相关关系。此外,随着凹土含量的增加,DBP和DEHP在土壤中的解吸过程加快。
[Abstract]:Phthalic acid estersof phthalate (PAEs) is a kind of organic pollutants widely existing in water, farmland and other environmental media. The adsorption-desorption behavior of dibutyl phthalate DBP and di-2-ethylhexylphthalate (DEHP) was studied by batch equilibrium adsorption method and continuous desorption method. The results showed that both Freundlich equation and Langumir equation could fit the adsorption behavior of DBP and DEHP in the soil with different concave soil contents, and their R2 values were higher than 0.92. In the Freundlich model, the LG K _ f values of DBP and DEHP in the three soils with 1.0% attapulgite content and 10.0% were 1.510 ~ 1.405 0 ~ 1.216 6 and 3.170 _ 4 ~ 3.084 ~ 83.034%, respectively. In the Langumir model, the change of QM value is the same as that of LG Kf value, and the nonlinearity decreases gradually. The results showed that the adsorption intensity of DBP and DEHP decreased with the addition of concave soil, and there was a strong positive correlation between LG Koc value and LG Kf value in Freundlich model and the adsorption capacity. DBP and DEHP in three kinds of soils with different concave content. In addition, the desorption process of DBP and DEHP in soil was accelerated with the increase of concave soil content.
【作者单位】：淮阴工学院生命科学与食品工程学院;江苏省凹土资源利用重点实验室;江苏省万邦香料有限公司;
【基金】：江苏省自然科学基金项目(BK20131216) 江苏省高等学校大学生创新创业训练计划项目(201611049032Y)
【分类号】：X131.3

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