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首页> 美国卫生研究院文献>Molecules >Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests
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Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests

机译：Fe-XAD8-DEHPA浸渍树脂对地下水吸附As（V）的研究。平衡吸附和固定床测试

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The characteristics of arsenic adsorption onto Fe-XAD8-DEHPA resin were studied on the laboratory scale using aqueous solutions and natural underground waters. Amberlite XAD8 resin was impregnated with di(2-ethylhexyl) phosphoric acid (DEHPA) via the dry method of impregnation. Fe(III) ions were loaded onto the impregnated resin by exploiting the high affinity of arsenic towards iron. The studies were conducted by both in contact and continuous modes. Kinetics data revealed that the removal of arsenic by Fe-XAD8-DEHPA resin is a pseudo-second-order reaction. The equilibrium data were modelled with Freundlich Langmuir and Dubinin Radushkevich (D-R) isotherms and it was found that the Freundlich model give the poorest correlation coefficient. The maximum adsorption capacity obtained from the Langmuir isotherm is 22.6 µg As(V)/g of Fe-XAD8-DEHPA resin. The mean free energy of adsorption was found in this study to be 7.2 kJ/mol and the ΔG° value negative (−9.2 kJ/mol). This indicates that the sorption process is exothermal, spontaneous and physical in nature. The studied Fe-XAD8-DEHPA resin showed excellent arsenic removal performance by sorption, both from synthetic solution and the natural water sample, and could be regenerated simply by using aqueous NaOH or HCl solutions.
机译：在实验室规模下，使用水溶液和天然地下水研究了砷在Fe-XAD8-DEHPA树脂上的吸附特性。通过干式浸渍法，用二（2-乙基己基）磷酸（DEHPA）浸渍Amberlite XAD8树脂。通过利用砷对铁的高亲和力，将Fe（III）离子加载到浸渍树脂上。通过接触和连续两种方式进行研究。动力学数据表明，Fe-XAD8-DEHPA树脂去除砷是伪二级反应。用Freundlich Langmuir和Dubinin Radushkevich（D-R）等温线对平衡数据进行建模，发现Freundlich模型的相关系数最差。从Langmuir等温线获得的最大吸附容量为22.6 µg As（V）/ g Fe-XAD8-DEHPA树脂。在这项研究中，平均吸附自由能为7.2 kJ / mol，ΔG°值为负（-9.2 kJ / mol）。这表明吸附过程本质上是放热的，自发的和物理的。所研究的Fe-XAD8-DEHPA树脂在合成溶液和天然水样品中均表现出优异的吸附除砷性能，并且可以使用NaOH或HCl水溶液简单地再生。

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