期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 172, 期 2-3, 页码 1131-1136出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.07.106
关键词
Basic dye; Fenton oxidation; Fly ash; Sorption
The removal of a basic dye, Rhodamine B (RhB), by fly ash adsorption, Fenton oxidation, and combined Fenton oxidation-fly ash adsorption were evaluated. Even though fly ash is a low cost absorbent, a high dose of fly ash was needed to remove RhB. Only 54% of RhB was removed by 80g L(-1) fly ash. Solution pH did not significantly affect the RhB sorption by fly ash after 8 h. Fenton reagents at H(2)O(2) dose of 6 x 10(-3) M and pH 3 rapidly decolorized 97% of RhB within 2 min, and 72% of COD removal was obtained at 30 min reaction time. Spectrum analysis result showed that a large area of UV spectrum at 200-400 nm remained after Fenton reaction. The addition of 1 g L-1 fly ash effectively removed COD from Fenton-treated solution, and the UV absorption spectrum at 220-400 nm totally vanished within 2h. COD removal of RhB by the combined Fenton oxidation and fly ash sorption process was 98%. The COD removal capacity of fly ash for Fenton-treated RhB solution was 41.6 times higher than that for untreated RhB solution. The results indicated that the combined process is a potential technique for RhB removal. (C) 2009 Elsevier B.V. All rights reserved.
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