期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 329, 期 -, 页码 290-298出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.01.054
关键词
(N,Fe)-dual-functional bio-sorbent; Nickel; Phosphate; Synergistic removal; Interaction mechanisms
资金
- National Natural Science Foundation of China [51522805]
- Discipline Crossing Foundation of Nanjing University
A novel (N,Fe)-dual-functional biosorbent (N/Fe-DB) capable of efficient synergistic removal of Ni(II) and H2PO4- from aqueous solution was synthesized. The adsorption capacities of Ni(II) and H2PO4- were both remarkably enhanced over 3 times compared with those in single systems. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirmed that complexation of amino groups and ligand exchange of hydrous ferric oxide in N/Fe-DB played dominant roles. The electric double layer compressing and chelating ligand of deprotonated H2PO4- accounted for the enhanced removal of Ni(II) in binary system, while cation bridge interaction promoted uptake of H2PO4-. Furthermore, the coadsorbates were sequentially recovered, with the ratios of more than 99.0%. Besides, the recovered N/Fe-DB remained stable and applicable to the treatment of real electroplating wastewater even after six adsorption-regeneration cycles. Since the electroplating industry is springing up, effective control of heavy metals and phosphate has attracted global concerns. Based on the enhanced coremoval properties and superb regenerability, N/Fe-DB is potentially applicable to practical production. (C) 2017 Elsevier B.V. All rights reserved.
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