Abstract
The extraction of uranium resources from the ocean is of great importance in energy exploration. This work reported a polysaccharide composite aerogel to adsorb uranium from the ocean, a facile freeze-drying strategy was explored to create a physically crosslinked artemisia sphaerocephala krasch gum (ASKG)-poly(amidoxime) (PAO) aerogel (ASKG@PAO). Due to the excellent hydrophilicity and swelling properties of artemisia spherecephala krasch gum, the ASKG@PAO can quickly and stably adsorb uranyl ions in the ocean. The batch adsorption test results showed ASKG@PAO (mASKG: mPAO = 1:1) has an excellent uranium removal rate (93.92 %) and a high uranium adsorption capacity (341.11 mg/g). Desorption kinetic experiments showed that the ASKG@PAO can desorb 90 % of the uranyl ions within 10 min and retain a removal rate of 87.3 % after five adsorption–desorption cycles. In addition, ASKG@PAO has excellent selectivity for uranyl ions. Consequently, ASKG@PAO aerogel has significant potential for extracting marine uranium resources.
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