title: Mineralization and deflourization of 2,2,3,3-tetrafluoro-1-propanol (TFP) by UV/persulfate oxidation and sequential adsorption.
abstract: This work demonstrates the combination of UV/persulfate and adsorption processes for treating 2,2,3,3-tetrafluoro-1-propanol (TFP) wastewater. Under the optimum conditions, 20mM persulfate (S(2)O(8)(2-)), 254 nm UV-C, and pH 3, 99.7% of TOC removal from an initial TFP solution of 1.39 mM was achieved. The photolysis of persulfate (S(2)O(8)(2-)) by UV irradiation yielded the sulfate radical (SO(4)(-)) with high activity, which mineralized most of the TFP in 2h. The released fluoride ions were then removed by using a waste iron oxide, BT-4 adsorbent. 20 g L(-1) BT-4 adsorbed 95% of the fluoride that was produced by mineralization of 1.39 mM TFP. The kinetics and isotherms of adsorption were examined to determine the fluoride removal efficiency of BT-4 which co-existed with the sulfate ions from the consumed sulfate radicals. Accordingly, the kinetics of adsorption was described by a pseudo-second-order rate model, while the adsorption isotherms were well fitted with the Langmuir model. BT-4 had a high adsorption capacity of 26.4 mg g(-1) (25°C) in removing the fluoride from TFP mineralization, suggesting that the co-existing sulfate ions never significantly affected the fluoride removal efficiency.
authors.affiliation: Department of Chemical Engineering, National Cheng-Kung University, Tainan 70148, Taiwan.
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Shih
authors.forename: Widha Nirwana
authors.initials: WN
authors.lastname: Putra
authors.forename: Yao-Hui
authors.initials: YH
authors.lastname: Huang
authors.forename: Jie-Cheng
authors.initials: JC
authors.lastname: Tsai
mesh_terms: D000327:Adsorption; D005459:Fluorides / Q000032:analysis / Q000737:chemistry*; D005466:Fluorocarbons / Q000032:analysis / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010782:Photolysis; D020005:Propanols / Q000032:analysis / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D005459:Fluorides; D005466:Fluorocarbons; D020005:Propanols; D062065:Wastewater; D014874:Water Pollutants, Chemical; C519792:2,2,3,3-tetrafluoro-1-propanol