1. Porous Cationic Electrospun Fibers with Sufficient Adsorption Sites for Effective and Continuous 99TcO4− Uptake.
- Author
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Zhao, Rui, Chen, Dingyang, Gao, Nvwa, Yuan, Liyong, Hu, Wei, Cui, Fengchao, Tian, Yuyang, Shi, Weiqun, Ma, Shengqian, and Zhu, Guangshan
- Subjects
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ADSORPTION (Chemistry) , *ADSORPTION capacity , *FIBERS , *PROCESS capability , *SORBENTS , *ADSORPTION kinetics - Abstract
Removal of radioactive technetium‐99 (99TcO4−) from water by effective adsorbents is highly desired but remains a challenge. The currently used resin adsorbents possess several obstacles, such as slow adsorption kinetics and low adsorption capacity. To address these issues, herein a type of fibrous adsorbent with porosity and hyper‐branched quaternary ammonium groups, namely porous cationic electrospun fibers (PCE fibers), is successfully prepared. PCE fibers can remove 97% of 99TcO4− within 1 min and the equilibrium time of 99% removal is 20 min. The predicted maximum adsorption capacity toward the surrogate ReO4− can reach 826 mg g−1, which is higher than the state of art anion‐exchange resins and most of the other reported adsorbents. Furthermore, PCE fibers have good selectivity for ReO4− in the presence of competitive anions, and can retain ReO4− uptake under extreme conditions including high acid–base and gamma irradiation. Importantly, PCE fibrous adsorptive membrane is employed for dynamic ReO4− removal from simulated Hanford LAW stream with a processing capacity of 600 kg simulated stream per kilogram PCE fibers. The excellent performance highlights the advantages of PCE fibers over traditional resins in technetium removal. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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