期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 423, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127184
关键词
Hydroxyapatite; Uranium; Adsorption; Freeze-drying-calci nation
资金
- National Natural Science Foundation of China [21902130, 21976147, 11602239]
- Sichuan Science and Technology Program [2019YFN0125, 2019ZDZX0027, 2020YFG0456, 2020YFG0147, 2020YFG0160, 2020YFG0191, 2020YFQ0014, 2020YFS0345, 2019YFG0514, 2019ZDZX0013, 2020JDJQ0060, 2020YFG0467, 2020JDRC0099, 2020ZDZX0012, 2020JDRC0089, 2020JDJQ0009]
- CAEP [YZJJLX2019007, 2402001]
- Research Fund of SWUST [17zx7135, 18zx7149, 19zx7129]
- Sichuan's Training Program of Innovation and Entrepreneurship for Undergraduate [S201910619101, S202010619038, S202010619056, S202010619057]
- Project of State Key Laboratory of Environment-friendly Energy Materials in SWUST [18fksy0218]
The study demonstrated that the HAP aerogel showed high adsorption efficiency for uranium in wastewater, achieving a removal efficiency of 99.4% within a short period of time, with a maximum adsorption capacity at low pH and temperature. The continuous porous structure of the HAP aerogel provided more active sites for uranium adsorption, making it a potential high efficiency adsorbent for uranium-containing wastewater treatment.
In order to protect environment and save uranium resources, it was necessary to find a highly efficient adsorbent for uranium recovery from wastewater. In this work, we used a freeze-drying-calcination method to synthesize HAP aerogel to effectively remove uranium. Compared with commercially available nano-hydroxyapatite, HAP aemgel presented better adsorption performance. This was because the as-prepared HAP aemgel presented continuous porous structure, which could provide more active sites for the adsorption to uranium. The uranium removal efficiency of HAP aerogel arrived 99.4% within 10 min and the maximum adsorption capacity was up to 2087.6 mg g(-1) at pH = 4.0 and 298 K. In addition, the immobilization of uranium on HAP aerogel was chemisorption, which was probably due to adsorption, dissolution-precipitation and ions exchange. These results indicated that the as-prepared HAP aerogel could be widely used as a high efficiency and potential adsorbent for the treatment of uranium-containing wastewater in the future.
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