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首页> 外文会议>International Conference on Environmental Science and Technology >INVESTIGATION OF SORPTION MECHANISM OF IONIC LIQUIDS ONTO SELECTED NATURAL SOILS
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INVESTIGATION OF SORPTION MECHANISM OF IONIC LIQUIDS ONTO SELECTED NATURAL SOILS

机译：离子液体吸附机理研究到所选天然土壤中的研究

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Ionic liquids are salts with melting points below 100°C. They consist of bulky organic cation, which includes nitrogen or phosphorus atoms, in combination with organic or inorganic anion such as bis(trifluoromethanesulfonyl)imide or tetrafluoroborate. Due to their unique properties, ionic liquids are investigated in the context of a wide variety of applications. However, modern design of chemicals takes into consideration equally the application potential, biological effect and environmental fate of the compound. Several studies have reported and evaluated toxicity potential of ionic liquids. Sorption plays crucial role in transport, reactivity or bioaviabilty of chemicals in the environment. In this work we have summarized studies on sorption of alkylimidazolium salts onto selected natural soils, differ in organic carbon content, cation exchange capacity and particle size distribution. The predominant sorption mechanism of alkylimidazolium cations in the soils appears to be ion exchange. The sorption increasing with increasing lipophilicity of the alkylimidazolium cations. Analysis of Freundlich isotherms indicate that added short chain cations are bound by ever weaker free energies. In the case of the longest alkyl chain ionic liquid, the greater sorbate presence in the sorbent enhances the free energies of further sorption. It was also found that compounds with longer alkyl chains become practically irreversibly bound to the soil component. Furthermore the adsorption coefficient was deduced from the capacity factor estimated from retention data of ionic liquids using a cyanopropyl stationary phase in the HPLC system and were further correlated with K_ocvalues obtained in a batch equilibration test. There is a significant correlation between both values obtained for agricultural soil and marine sediment The maximum surface concentrations obtained in the detailed experiments on the sorption mechanism were much above CEC values of studied soils. This may indicate that ionic liquids initially sorbed modify sorption surface, what could lead into multilayer sorption. Results suggest if those process occurs, such mechanism will be applicable to all ionic liquids, however, saturation of the second layer is only achieved for the longest alkyl chain compounds. Experiments considering influence of varying pH or ionic strength of an aquifer on sorption dependency of the ionic liquid were also performed.
机译：离子液体是盐，熔点低于100℃。它们由庞大的有机阳离子组成，其包括氮气或磷原子，与有机或无机阴离子组合，例如双（三氟甲磺酰基）酰亚胺或四氟硼酸盐。由于其独特的性质，在各种应用的背景下研究了离子液体。然而，现代化学品设计表明，同样考虑了化合物的应用潜力，生物学效果和环境命运。报告了几项研究，并评估了离子液体的毒性潜力。吸附在环境中的化学品的运输，反应性或生物生物中起着至关重要的作用。在这项工作中，我们总结了对烷基咪唑鎓盐的吸附研究在选定的天然土壤上，有机碳含量，阳离子交换能力和粒度分布不同。土壤中烷基咪唑鎓阳离子的主要吸收机理似乎是离子交换。随着烷基咪唑阳离子的脂肪酸性脂肪性的增加而增加。 Freundlich等温机的分析表明，添加的短链阳离子受到较弱的能量。在最长的烷基链离子液体的情况下，吸附剂中较大的吸附酸盐存在增强了进一步吸附的自由能量。还发现，具有较长烷基链的化合物几乎不可逆转地与土壤成分结合。此外，使用HPLC系统中的氰丙丙基固定相管从离子液体的保留数据估计的容量因数推导出吸附系数，并与批量平衡测试中获得的K_ocvalues进一步相关。对于农业土壤和海洋沉积物获得的两个值之间存在显着的相关性，在吸附机制的详细实验中获得的最大表面浓度远高于研究土壤的CEC值。这可能表明离子液体最初吸附过滤表面，可能导致多层吸附。结果表明，如果发生这些方法，则这种机制将适用于所有离子液体，然而，仅对最长的烷基链化合物实现第二层的饱和。还进行了考虑对含水层的不同pH或离子强度对离子液体的吸附依赖性的影响的实验。

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