Department of Chemistry, Faculty of Science, University of Sarajevo, Zmaja od Bosne 33-35, 71000, Sarajevo, Bosnia and Herzegovina; International Society of Engineering Science and Technology, United Kingdom.
Department of Chemistry, Faculty of Science, University of Sarajevo, Zmaja od Bosne 33-35, 71000, Sarajevo, Bosnia and Herzegovina.
Environ Res. 2024 Dec 15;263(Pt 1):120034. doi: 10.1016/j.envres.2024.120034. Epub 2024 Sep 20.
Adsorption for uranium removal from aqueous systems has been extensively studied, due to its many advantages. However, the great costs and complexity of many sorbent preparation methods are still restricting the progress. Hence, this research aimed to introduce a novel, simple and green method for enhancing Amberlite IR-120 properties for U(VI) removal. Adsorption process parameters were evaluated by batch method and sorbent was characterized before and after uranium adsorption by FTIR, SEM and EDS analysis. The results demonstrated that sorbent was effective for U(VI) removal at pH 5, 100 mg dose with 60 mg/L of U(VI) concentration within 40 min at higher temperatures. The removal efficiency was 87.7% and process was found feasible according to thermodynamic data. Kinetic modelling showed best correlation with pseudo-second order model (r = 0.999) and applied isotherms could all describe investigated process suggesting a complex mechanism of U(VI) uptake. Effect of interfering ions (Pb(II), Ni(II) and Co(II)) in a concentration of 45 and 60 mg/L decreased U(VI) removal to 45%. Additionally, AAS method confirmed that used sorbent has significant affinity towards Pb(II). Desorption study revealed successful uranium recovery in up to 3 cycles of sorption/desorption. The EDS analysis revealed the uranium presence with 4.7% and FTIR analysis revealed bands characteristic for stretching vibrations of O=U=O. Proposed mechanism involved U(VI) uptake via non-covalent interactions, inter/intra-molecular hydrogen bonding and intraparticle diffusion. Techno-economic analysis showed that with used preparation method 1 g of ASP costs 0.022 $. Hence, this study offers a novel method for sorbents properties enhancements.
由于其诸多优点，从水溶液中去除铀的吸附已得到广泛研究。然而，许多吸附剂制备方法的高成本和复杂性仍然限制了其发展。因此，本研究旨在介绍一种新颖、简单且绿色的方法，以增强 Amberlite IR-120 对 U(VI)去除的性能。通过批量法评估了吸附过程参数，并通过 FTIR、SEM 和 EDS 分析对吸附前后的吸附剂进行了表征。结果表明，在 pH 值为 5、U(VI)浓度为 100 mg/L、剂量为 60 mg、温度较高的条件下，吸附剂对 U(VI)的去除效果较好，在 40 min 内去除率达到 87.7%。根据热力学数据，该过程是可行的。动力学模型与准二级模型（r = 0.999）的相关性最好，应用的等温线都可以描述所研究的过程，表明 U(VI)摄取的机制复杂。在浓度为 45 和 60 mg/L 的情况下，共存离子（Pb(II)、Ni(II)和 Co(II)）的干扰会将 U(VI)的去除率降低至 45%。此外，AAS 方法证实了所使用的吸附剂对 Pb(II)具有显著的亲和力。解吸研究表明，在多达 3 次的吸附/解吸循环中，铀可以被成功回收。EDS 分析表明存在 4.7%的铀，FTIR 分析表明存在 O=U=O 伸缩振动的特征谱带。提出的机制涉及 U(VI)通过非共价相互作用、内/分子间氢键和颗粒内扩散进行摄取。技术经济分析表明，采用所提出的制备方法，1 g ASP 的成本为 0.022 美元。因此，本研究为吸附剂性能的增强提供了一种新方法。
