新型冠醚-膦酸锆材料的制备及其对锶吸附性能研究
Preparation of Crown Ether Pillared Zirconium Phosphonate and Selective Adsorption for Strontium
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摘要: 为高效分离锶元素，本文采用直接反应插层的方法将4-氨基苯并-18-冠-6引入α相磷酸锆层间获得新型冠醚@膦酸锆复合材料（D-AM-ZrP）。通过控制反应过程中无机磷与有机膦的比例获得具有花状形貌及有序结构的D-AM-ZrP。该材料可有效的结合α-ZrP与4-氨基苯并-18-冠-6的优势，在复杂体系中对Sr2+具有良好的吸附性和选择性，在弱酸性条件下对Sr2+的吸附容量达到136.42 mg·g-1，优于未插层的α-ZrP(28.17 mg·g-1)。Abstract: Separation of strontium isotope is an important and challenging work. Herein, a novel method was developed for preparing of acid-resistance crown ether pillared zirconium phosphonate (D-AM-ZrP) by a directly one step reacting 4-amino-benzo-18-crown-6 phosphonic acid with zirconium other than the conventional complicated intercalation methods. By suitable control of the ratio of phosphoric acid to phosphonic acid, the D-AM-ZrP sample with perfect flower-like and well-ordered interlayer structure was obtained. More importantly, D-AM-ZrP exhibited high adsorption capacity and excellent selectivity for extracting Sr2+ from complicated system including high concentrated HNO3 media and competing ions, and the maximum adsorption capacity for Sr2+ (136.42 mg·g-1) was better than that of pure α-ZrP (28.17 mg·g-1) at weak acidic media, which could mainly be attributed to the presence of the strong chemical interaction between the intercalated molecule and material, resulting in its excellent stability and abundant adsorption sites.
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Keywords:
- intercalation /
- crown ether /
- zirconium phosphonate /
- adsorption /
- Sr2+
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