Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 331, Issue 1, Pages 353-364Publisher
SPRINGER
DOI: 10.1007/s10967-021-08115-x
Keywords
Uranium; Amidoxime; Adsorption; Luffa; Mesoporous activated carbon
Funding
- National Natural Science Foundation of China [22066001]
- Natural Science Foundations of Jiangxi Province of China [20202BABL213010]
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This study successfully prepared a mesoporous biomass carbon adsorbent derived from chemically modified Luffa with task-specific amidoxime group. The adsorbent showed high adsorption capacity and competitive adsorption ability, which was verified using various analysis methods. The effects of operational parameters on the adsorption of U(VI) with the adsorbent were investigated. The study not only expanded the application fields of Luffa biomass, but also enriched the list of uranium adsorbents.
Biomass is one of the most important carbon raw due to high availability and low cost. In this study mesoporous biomass carbon adsorbent derived from Luffa chemically modified with task-specific amidoxime group (Luffa-AO for short) was prepared. Luffa-AO was verified using SEM, TEM, FT-IR, N-2 adsorption-desorption isotherm and X-ray photoelectron spectroscopy (XPS). The effects of operational parameters such as pH, mixing time, initial uranium concentration, temperature and recycle time on the adsorption of U(VI) with Luffa-AO were studied. The results showed that the saturation adsorption amount q(max) reached 247.58 mg g(-1), a competitive adsorption ability compared with the values reported in the previous references. Kinetics, isotherm and thermodynamics were investigated. The variation in binding energy elucidated with XPS indicated nitrogen and oxygen atoms involved in the process of complexing uranium. The study expanded the application fields of Luffa biomass and enriched the list of uranium adsorbents.
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