| 吴艳华,周东美,高娟,司友斌.三种邻苯二甲酸酯在不同黏土矿物上的吸附[J].农业环境科学学报,2015,34(6):1107-1114. |
| 三种邻苯二甲酸酯在不同黏土矿物上的吸附 |
| Adsorption of Three Phthalic Acid Esters on Different Clay Minerals |
| 投稿时间：2015-01-08 |
| DOI：10.11654/jaes.2015.06.013 |
| 中文关键词: 邻苯二甲酸酯类 黏土矿物 吸附 解吸 |
| 英文关键词: phthalic acid esters clay minerals adsorption desorption |
| 基金项目:国家自然科学基金(21377136);中国科学院百人计划项目(2014CB441105) |
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| 中文摘要: |
| 邻苯二甲酸酯类(PAEs)作为一类常见的增塑剂可以通过多种途径进入土壤, 并在土壤中富集。黏土矿物是土壤的一个重要组分, 对有机污染物的迁移有重要的作用。通过考察三种PAEs,即邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)和邻苯二甲酸正丁酯(DnBP)在改性之后的K+饱和黏土矿物(K-FZ-10,K-SMF和K-Kao)上的吸附行为, 分析了黏土矿物类型、PAEs种类以及温度对吸附的影响。试验结果能较好地用Freundlich方程进行拟合, 结果表明:PAEs的疏水性越强, 固相-水分配系数(Kd)越大, PAEs越容易被黏土矿物吸附;三种PAEs在黏土矿物上的吸附量均呈现DMP+饱和黏土矿物对PAEs的吸附能力均是K-FZ-10>K-SMF>K-Kao,其与黏土矿物的表面积呈正相关。不同温度(4、10、20 ℃和30 ℃)的试验结果表明, 黏土矿物对三种PAEs的吸附量随温度升高而减少。黏土矿物的类型、PAEs的疏水性和温度对PAEs在黏土矿物上的吸附均有显着影响, 即黏土矿物表面积越大, PAEs的疏水性越强, 环境温度越低, PAEs的吸附量越大, 表明这三种因素对PAEs在土壤中的迁移起重要作用。 |
| 英文摘要: |
| Phthalic acid esters(PAEs) are widely used as plasticizers and are easily released into the environment, posing potential harms to human. Clay minerals are an important component of soil. After PAEs enter soils, the clay minerals would inevitably affect the transformation and fates of PAEs. Here we examined PAEs adsorption on clay minerals using two montmorillonite clays(FZ-10, SMF) and one kaolinite clay(Kao) as adsorbents that were saturated with K ions(K-FZ-10,K-SMF and K-Kao). Results showed that the adsorption of PAEs by clay minerals were in the following order: dimethyl phthalate(DMP)Kd) were positively related to their hydrophobicities(DMPK-SMF>K-Kao. Both type and surface area of clay minerals contributed to the adsorption ability. Temperature rise reduced the adsorptions of three PAEs on K-FZ-10, K-SMF and K-Kao, indicating that the adsorption was exothermic and spontaneous. This study revealed that the type of clays, hydrophobicityof PAEs and temperature were three important factors affecting the adsorption of PAEs on clay minerals. The adsorption of PAEs onto soil could be used to predict the transportation in soil to some extent. |
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