{"title":"Diglycolamide with long C-chains combined with ether bonds for high loading of Am(III) and Eu(III): Extraction, aggregation, and third-phase formation studies","authors":"Xiaoyang Hu, Haowei Xu, Zhuang Wang, Qiao Yu, Xuanhao Huang, Xingyue Liu, Qiang Tian, Songdong Ding","doi":"10.1016/j.seppur.2024.131113","DOIUrl":null,"url":null,"abstract":"Diglycolamide (DGA) extractants, especially TODGA (<em>N</em>,<em>N</em>,<em>N′</em>,<em>N′</em>‐tetraoctyl diglycolamide), show significant potential in high-level liquid waste treatment. However, their limited loading capacity for trivalent lanthanides (Lns) and actinides (Ans) often leads to detrimental emulsification or third phase formation, hindering their practical applicability. Herein, TOOEDGA (<em>N</em>,<em>N</em>,<em>N’</em>,<em>N’</em>-tetra(2-(octyloxy)ethyl)diglycolamide), a new DGA extractant with long C-chains combined with ether bonds, exhibits superior extraction performance towards Am<sup>3+</sup> and Eu<sup>3+</sup> in HNO<sub>3</sub> solution compared to TODGA. The factors influencing the formation of a third phase during the extraction process were investigated. It has been shown that TOOEDGA has a greater loading capacity for Lns<sup>3+</sup> and can tolerate a wider concentration range of HNO<sub>3</sub>. Additionally, the aggregation behavior of DGAs in <em>n</em>-dodecane was also studied using dynamic light scattering and small-angle X-ray scattering, revealing that the reverse micelles formed by TOOEDGA are more stable than those formed by TODGA. Moreover, under similar conditions, TOOEDGA molecules do not aggregate further to generate rod-like reverse micelle aggregates like those observed with TODGA, which is beneficial to inhibit the formation of the third phase. Consequently, our results suggest that TOOEDGA holds great promise as an alternative DGA extractant for practical industrial applications.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"89 1","pages":""},"PeriodicalIF":8.1000,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.seppur.2024.131113","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Diglycolamide with long C-chains combined with ether bonds for high loading of Am(III) and Eu(III): Extraction, aggregation, and third-phase formation studies
Diglycolamide (DGA) extractants, especially TODGA (N,N,N′,N′‐tetraoctyl diglycolamide), show significant potential in high-level liquid waste treatment. However, their limited loading capacity for trivalent lanthanides (Lns) and actinides (Ans) often leads to detrimental emulsification or third phase formation, hindering their practical applicability. Herein, TOOEDGA (N,N,N’,N’-tetra(2-(octyloxy)ethyl)diglycolamide), a new DGA extractant with long C-chains combined with ether bonds, exhibits superior extraction performance towards Am3+ and Eu3+ in HNO3 solution compared to TODGA. The factors influencing the formation of a third phase during the extraction process were investigated. It has been shown that TOOEDGA has a greater loading capacity for Lns3+ and can tolerate a wider concentration range of HNO3. Additionally, the aggregation behavior of DGAs in n-dodecane was also studied using dynamic light scattering and small-angle X-ray scattering, revealing that the reverse micelles formed by TOOEDGA are more stable than those formed by TODGA. Moreover, under similar conditions, TOOEDGA molecules do not aggregate further to generate rod-like reverse micelle aggregates like those observed with TODGA, which is beneficial to inhibit the formation of the third phase. Consequently, our results suggest that TOOEDGA holds great promise as an alternative DGA extractant for practical industrial applications.
期刊介绍:
Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.