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| Adsorption of Three Phthalic Acid Esters on Different Clay Minerals |
| Received:January 08, 2015 |
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| KeyWord:phthalic acid esters;clay minerals;adsorption;desorption |
| Author Name | Affiliation | E-mail | | WU Yan-hua | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | GAO Juan | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | juangao@issas.ac.cn | | SI You-bin | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | youbinsi@ahau.edu.cn |
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| Abstract: |
| 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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