title: Enhancement of Rhodamine B removal by low-cost fly ash sorption with Fenton pre-oxidation.
abstract: 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 80 g L(-1) fly ash. Solution pH did not significantly affect the RhB sorption by fly ash after 8h. 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 30min reaction time. Spectrum analysis result showed that a large area of UV spectrum at 200-400 nm remained after Fenton reaction. The addition of 1gL(-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.
authors.affiliation: Department of Public Health, Chung-Shan Medical University, Taichung 402, Taiwan, ROC. shchang@csmu.edu.tw
authors.forename: Shih-Hsien
authors.initials: SH
authors.lastname: Chang
authors.forename: Kai-Sung
authors.initials: KS
authors.lastname: Wang
authors.forename: Heng-Ching
authors.initials: HC
authors.lastname: Li
authors.forename: Ming-Yen
authors.initials: MY
authors.lastname: Wey
authors.forename: Jing-Dong
authors.initials: JD
authors.lastname: Chou
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry* / Q000191:economics; D060729:Coal Ash; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D052638:Particulate Matter / Q000737:chemistry* / Q000191:economics; D012235:Rhodamines / Q000302:isolation & purification*
chemical_list: D060729:Coal Ash; C045076:Fenton's reagent; D052638:Particulate Matter; D012235:Rhodamines; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron; C029773:rhodamine B