We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Study on uranium ion adsorption property of porous glass modified with amidoxime group.
- Authors
Wang, Bingxin; Hu, Hongyuan; Huang, Difei; Tao, Yuqiang
- Abstract
In this paper, we prepared three types of porous glasses (PGs) with specific surface areas of 311.60 m2/g, 277.60 m2/g, and 231.38 m2/g, respectively, via borosilicate glass phase separation. These glasses were further modified with amidoxime groups (AO) using the hydroxylamine method, yielding adsorbents named 1.5-PG-AO, 2-PG-AO, and 3-PG-AO. The adsorption performance of these adsorbents under various conditions was investigated, including sorption kinetics and adsorption mechanisms. The results reveal that the number of micropores and specific surface area of PG are significantly reduced after AO modification. All three adsorbents exhibit similar adsorption capabilities. Particularly, pH has a pronounced effect on U (VI) adsorption of PG-AO, with a maximum value at pH = 4.5. Equilibrium adsorption is achieved within 2 h, with a maximum adsorption capacity of 129 mg/g. Notably, a uranium removal rate of 99.94% is attained. Furthermore, the adsorbents show high selectivity in uranium solutions containing Na+ or K+. Moreover, the adsorbents demonstrate exceptional regeneration ability, with the removal rate remaining above 80% even after undergoing five adsorption–desorption cycles. The adsorption reaction of uranium on PG-AO involves a combination of multiple processes, with monolayer chemisorption being the dominant mechanism. Both the complex adsorption of AO and the ion exchange and physical adsorption of PG contribute to the adsorption of uranyl ions on the PG-AO adsorbents.
- Subjects
URANIUM; PHYSISORPTION; ADSORPTION (Chemistry); ADSORPTION kinetics; ADSORPTION capacity; BOROSILICATES
- Publication
Environmental Science & Pollution Research, 2024, Vol 31, Issue 17, p26204
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-024-32943-5