期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 361, 期 -, 页码 200-209出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.07.036
关键词
Spent potlining; Purolite S950+; Chelating resin; Fluoride uptake; Lanthanum
资金
- EPSRC [EP/L016281/1]
- Bawtry Carbon International Ltd.
- EPSRC [EP/M028437/1] Funding Source: UKRI
Spent potlining (SPL) hazardous waste is a potentially valuable source of fluoride, which may be recovered through chemical leaching and adsorption with a selective sorbent. For this purpose, the commercially available chelating resin Purolite S950 + was loaded with lanthanum ions, to create a novel ligand-exchange sorbent. The equilibrium fluoride uptake behaviour of the resin was thoroughly investigated, using NaF solution and a simulant leachate of SPL waste. The resin exhibited a large maximum defluoridation capacity of 187 +/- 15 mg g(-1) from NaF solution and 126 +/- 10 mg g(-1) from the leachate, with solution pH being strongly influential to uptake performance. Isotherm and spectral data indicated that both chemisorption and unexpected physisorption processes were involved in the fluoride extraction and suggested that the major uptake mechanism differed in each matrix. The resin demonstrates significant potential in the recovery of fluoride from aqueous waste streams.
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