Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 292, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.121045
Keywords
beta-Bi2O3; Radioactive anions; Adsorption; Chemical transformation; Immobilization
Categories
Funding
- National Natural Science Foundation of China [21906128]
- Young Talent Support Plan of Xi'an Jiaotong University [7121181102]
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This research presents the fabrication of pristine 13-Bi2O3 microflowers with high adsorption ability for selenite and iodide. The adsorbents exhibit excellent selectivity and stability in the presence of competitive anions. The findings suggest that pristine 13-Bi2O3 microflowers have potential applications in the extraction and immobilization of radioactive anions from wastewater.
It is a great challenge to design absorbent materials with high adsorption capacity and selectivity for immobilizing radioactive anions from wastewater. Herein, pristine 13-Bi2O3 microflowers are fabricated via a facile urea assisted alcoholysis of bismuth nitrate pentahydrate. The material exhibits highly efficient adsorption ability of both selenite (SeO32-) and iodide (I-) with fast kinetics and high capacities. The maximum adsorption capacities are 571 mg/g for SeO(3)(2-)and 239.5 mg/g for I-, which are much higher than those of most of the reported adsorbents. Furthermore, the adsorbents show excellent selectivity for both SeO(3)(2-)and I- in the presence of largely excessive competitive anions, such as sulfate and nitrate, and can steadily work over a broad pH range from 4 to 11. The adsorbent presents excellent resistance for leaching the adsorbed ions into solution, thus exhibiting good practicability for the efficient removal of anions from the target anion-contaminated synthetic seawater. The excellent adsorption and stable chemical immobilization performance of anions are attributed micro/nanostructure of the 13-Bi2O3 microflowers and facilitate them a potential adsorbents. These findings would render pristine 13-Bi(2)O(3 )promising for radioactive anion extraction and immobilization from wastewater.
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