Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An equilibrium study

JOURNAL OF HAZARDOUS MATERIALS

卷:361

Article

Robshaw, Thomas¹  Tukra, Sudhir²  Hammond, Deborah B.³  Leggett, Graham J.³  Ogden, Mark D.¹ 

[1] Univ Sheffield, Separat & Nucl Chem Engn Res SNUCER, Dept Chem & Biol Engn, Sheffield S1 3JD, S Yorkshire, England

[2] Bawtry Carbon Int Ltd, Doncaster DN10 6QT, England

[3] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England

关键词: Spent potlining;    Purolite S950+;    Chelating resin;    Fluoride uptake;    Lanthanum;   

DOI  :  10.1016/j.jhazmat.2018.07.036

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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