期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 391, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122057
关键词
Sludge; Biochar; nZVI; Antimony; Adsorption; Oxidation
资金
- Outstanding Youth Foundation of Education Bureau Hunan Province [17B119]
- National Natural Science Foundation of China [51709103]
- Key Research and Development Program in Hunan Province [2018SK2022]
- China Postdoctoral Science Foundation [2018M630901]
The nano zero-valent iron sludge-based biochar (nZVI-SBC) was prepared in this study to eliminate Sb(III) from aqueous solutions, which was characterized by BET, SEM, XRD, TEM, FTIR, XPS. Our results proved that the incorporated nZVI on SBC matrix could significantly enhance eliminating Sb(III), and the max-adsorption capacity (160.40 mg g(-1)) can be achieved at pH = 4.8 +/- 0.2 and temperature of 298 K. The effect of co-existing anions and natural organic matters on the Sb(III) adsorption efficiencies were systematically investigated. The surface complexation is the possible adsorption mechanisms by FTIR and XPS. Furthermore, mechanistic investigation revealed that center dot OH and hydroquinone radical (H-SQ center dot(-)) could be the primary oxidants for the transformation of Sb(III) under oxic conditions, while 9,10-phenanthrene quinone radical (P-SQ center dot(-)) were responsible under anoxic conditions. Thus, the enhanced elimination of Sb(III) from aqueous solution was ascribed to the combined adsorption and oxidation. The potential engineering application of nZVI-SBC can be proved through three actual water matrix experiments, including lake water, river water and acid mine drainage. Our present findings proved that nZVI-SBC could be a potential adsorbent, given the excellent performance in the adsorption processes, as well as the toxicity alleviating ability and economic advantages, especially under subsurface water.
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