期刊
CHEMICAL ENGINEERING JOURNAL
卷 426, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131629
关键词
Iodide; Iodate; Bismuth-based material; Adsorption; Immobilization
资金
- National Natural Science Foundation of China [21976148, 21906133, 22076155, 11905177]
- Basic Scientific Research Project of China [KY20007]
- Sichuan Science and Technology Program [2020JDRC0068]
- Project of State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology [18zxhk04]
- Long Shan Talent Project [18LZX304, 18LZXT04]
- Doctoral Foundation Project of Southwest University of Science and Technology [18zx7148]
A stable millimeter-level bismuth-based polymer composite bead was developed for effectively removing radioactive iodine from aqueous solutions, showing high adsorption capacities and selective removal of iodine anions. The composite bead demonstrated efficient removal kinetics, reduced leaching, and easy separation, making it a promising candidate for environmental remediation of iodine-contaminated water.
Effectively remove radioactive iodine from aqueous solutions is highly desirable for the purpose of radioactive liquid waste treatment. However, anionic radioiodine species do not prefer to sorb on minerals or inorganic sorbents. Herein, we report a stable millimeter-level bismuth-based polymer composite beads (delta-Bi2O3@PES) with fast removal kinetics and high adsorption capacities for both iodide (I-) and iodate (IO3-). Abundant micro flower-like delta-Bi2O3 was embedded in the porous interconnection network of polymer composite beads, making it an effective adsorbent for removing radioactive iodine. delta-Bi2O3@PES composite beads showed high adsorption capacities of 95.4 mg/g and 170.6 mg/g for I- and IO3- by forming an insoluble Bi4I2O5 and BiOIO3 phase, respectively, which also can selectively remove iodine anions in the presence of large excesses of NO3- and SO42-. Furthermore, delta-Bi2O3@PES composite beads can highly reduce the Bi-3(+) leaching of delta-Bi2O3 powder after immersed in the acid solution and can be easily separated from the liquid after sorption. The performance of delta-Bi2O3@PES in dynamic column experiments indicates that economical Bi-based composite bead is a promising candidate sorbent for environmental remediation of actual iodine-contaminated water.
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