Temperature-swing adsorption of aromatic compounds in water using polyampholyte gel
Temperature-swing adsorption of aromatic compounds in water using polyampholyte gel
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DOI：
10.1007/s10450-008-9112-2
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发表时间：
2008-10-01
影响因子：
3.3
通讯作者：
Nakano, Yoshio
中科院分区：
文献类型：
--
作者：
Morisada, Shintaro;Suzuki, Hiroko;Nakano, Yoshio
研究了由苯乙烯硫酸钠（SSS）和乙烯基苄基三甲基氯化铵（VBTA）组成的两性聚电解质凝胶对几种疏水芳香族化合物的吸附性能。使用N-异丙基丙烯酰胺（NIPA）凝胶，也进行了相应的实验进行比较。在室温下，NIPA凝胶几乎不吸附芳香族化合物，而在较高温度下吸附它们。SSS-VBTA凝胶对多环芳烃的吸附量随温度的升高而降低，而对单环芳烃的吸附量几乎不受温度的影响，且吸附量小于多环芳烃。这些结果表明，SSS-VBTA凝胶中的芳香环可能在芳香族化合物的吸附中起重要作用。此外，它已被证明，SSS-VBTA凝胶可以重复吸附双酚-A在室温下，并在更高的温度下通过温度摆动操作解吸它：这种行为是截然相反的NIPA凝胶。这表明SSS-VBTA凝胶更适合于从非常稀的水溶液中吸附除去疏水性芳族化合物，因为当使用NIPA凝胶时，需要大量的能量来加热大量的水。
The adsorption property of the polyampholyte gel composed of sodium styrene sulfate (SSS) and vinylbenzyl trimethylammonium chloride (VBTA) has been investigated with several hydrophobic aromatic compounds as adsorbate. Using the N-isopropylacrylamide (NIPA) gel, the corresponding experiments were also performed for comparison. At room temperature, the NIPA gel hardly adsorbed the aromatic compounds, while it adsorbed them at higher temperatures. As for the SSS-VBTA gel, the adsorption amounts of the polyaromatic compounds decreased with increasing temperature, while the adsorption amounts of the monoaromatic compounds were almost independent of temperature and smaller than those of the polyaromatic compounds. These results indicate that the aromatic rings in the SSS-VBTA gel may play an important role in the adsorption of the aromatic compounds. Also, it has been demonstrated that the SSS-VBTA gel can repeatedly adsorb bisphenol-A at room temperature and desorb it at higher temperature by the temperature-swing operation: this behavior is diametrically opposite to that of the NIPA gel. This shows that the SSS-VBTA gel is much more suitable for the adsorption removal of the hydrophobic aromatic compounds from very dilute aqueous solutions, because a vast amount of energy is required for heating a large amount of water when using the NIPA gel.