期刊
JOURNAL OF CLEANER PRODUCTION
卷 374, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.134059
关键词
TiO2@SiO2-CMBC; Separation; Thorium; Uranium
资金
- Presidential Funding of CAEP [YZJJLX2019007]
- Sichuan Science and Technology Program [2022YFN0029, 2020JDJQ0009, 2020JDRC0099, 2020YFG0467, 2020YFS0345, 2020ZDZX0012]
- Career Development Funding of CAEP [2402001]
- Sichuan's Training Program of Innovation and Entrepreneurship for Undergraduate [S202110619086, S202110619061]
- Research Fund of SWUST [17zx7135, 18zx7149, 19zx7129]
- National Natural Science Foundation of China [21902130, 21976147]
The study demonstrated that the cow manure-derived biocarbon-based composite showed high efficiency in separating uranium(VI) and thorium(IV) under acidic conditions, with removal percentages of 97.5% and 99.8% respectively. It also exhibited good reusability, providing a new pathway for stable separation of these ions.
The development and utilization of nuclear energy produced a large amount of uranium(VI)/thorium(IV)-containing wastewater, which would be harmful to the environment. The enrichment of the radioactive ions from wastewater using a green and environmentally friendly technology was great important to the protection of water environment and the resource utilization of energy materials. In this work, a novel cow manure-derived biocarbon-based composite was prepared by impregnation-carbonization technology for the separation of thorium(IV) and uranium(VI) from water. The composite could efficiently separate the target ions under acidic condition (pH = 4.5) with high saturated separation capacities (675.1 mg/g for uranium(VI) and 710.4 mg/g for thorium(IV)), high removal percentages (97.5% for uranium(VI) and 99.8% for thorium(IV)), fast separation rates in the initial stage of separation process (10.3 mg/(g.min) for thorium(IV) and 4.6 mg/(g.min) for uranium (VI) and good reusability after five cycles. Even in 1.0 g/L of NaCl solution, the removal efficiencies still exceeded 88.4% for uranium(VI) and 93.1% for thorium(IV). These results exposed the perfect performance of the cow manure-derived biochar-based composite in thorium(IV) and uranium(VI) separation. Moreover, various models were used to fit the experimental data, which revealed that the uranium(VI)/thorium(IV) separation on the biocarbon composite was monolayer chemical adsorption and the complexation was mainly the way for capturing uranium(VI) and thorium(IV). This work might offer a new perspective for the resource management of animal manure and a prospect for the practical application of biochar in thorium(IV) and uranium(VI) recovery.
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