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首页> 外文期刊>Polish Journal of Environmental Studies >New Effective Sorbents for Removal of Am-241 from Drinking Water
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New Effective Sorbents for Removal of Am-241 from Drinking Water

机译：用于去除饮用水中Am-241的新型有效吸附剂

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摘要

Two new sorbents for americium(III) removal from an aqueous environment were studied: Volclay bentonite and red clay - both modified by a cationic surfactant (hexadecyltrimethylammonium bromide) and phosphate ions. Sorption of Am(III) was investigated using the batch method. It was concluded that the kinetics of Am(III) sorption on both sorbents can be evaluated based on the pseudo-second-order rate equation. The following two-parameter equations - Langmuir-Freundlich, Temkin, and Dubinin-Radushkevich isotherms - were examined for their ability to model equilibrium sorption data. It was shown that bentonite and red clay modified by phosphate ions exhibited better sorption properties toward Am(III) ions than sodium forms of the adsorbents. This was probably a result of the complexation of Am(III) ions by PO43- ions immobilized on the adsorbent surface in the form of ionic pairs with surfactant cations. Changes in Am(III) sorption with pH were modeled based on the molar fractions of the particular complexes in the aqueous phase, and it was concluded that Am(CO3)(3)(3-) and Am(OH)(3) species had a predominant influence on the overall sorption process.
机译：研究了两种从水性环境中去除ium的新吸附剂：Volclay膨润土和红粘土-均被阳离子表面活性剂（十六烷基三甲基溴化铵）和磷酸根离子改性。使用分批方法研究了对Am（III）的吸附。结论是，可以基于拟二级速率方程评估两种吸附剂上Am（III）的吸附动力学。研究了以下两个参数方程式-Langmuir-Freundlich，Temkin和Dubinin-Radushkevich等温线-建模平衡吸附数据的能力。结果表明，与钠形式的吸附剂相比，被磷酸根离子改性的膨润土和红粘土对Am（III）离子的吸附性能更好。这可能是Am（III）离子与以表面活性剂阳离子的离子对形式固定在吸附剂表面上的PO43-离子络合的结果。根据特定配合物在水相中的摩尔分数对Am（III）吸附随pH的变化进行建模，并得出结论：Am（CO3）（3）（3-）和Am（OH）（3）种类对整个吸附过程有主要影响。

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