期刊
CHEMICAL ENGINEERING JOURNAL
卷 366, 期 -, 页码 368-377出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.098
关键词
Biochar; Nanoscale zero-valent iron; U(VI); Adsorption and reduction; Removal mechanism
资金
- Fundamental Research Funds for the Central Universities [2018ZD11, 2018MS114]
- National Natural Science Foundation of China [21876048, 21836001, 21577032, 21607042]
- National Key Research and Development Program of China [2017YFA0207002]
- Guangdong Provincial Key Laboratory of Environmental Pollution and Health [GZKLEPH201815]
Nanoscale zero-valent iron (NZVI) has been considered as a potential scavenger for U(VI) elimination from aqueous environment. To decrease the aggregation and to improve antioxidation, sulfidation technology and biochar were applied to modify NZVI. In this work, Dictyophora indusiate-derived biochar supported sulfide NZVI (DI-SNZVI) was synthesized and applied for U(VI) elimination. The excellent behaviors of kinetics (3 h for equilibrium), thermodynamic research and maximum removal amounts (427.9 mg . g(-1) at pH= 5.0 and 298 K) revealed the outstanding performances of DI-SNZVI in U(VI) removal. The cycle experiments and different water system investigations further illustrated its potential ability for real applications. Moreover, the abundant functional groups and FeSx shell of DI-SNZVI were proved to be responsible for the enhanced removal of U(VI). In the end, the macroscopic and XPS study revealed that U(VI) elimination mechanisms were synergistic attributed to the adsorptive and reductive processes. This paper highlighted the biochar-based sulfide NZVI for efficient U(VI) elimination in environmental pollution management.
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