title: Fructose Accelerates UV-C Induced Photochemical Degradation of Pentachlorophenol in Low and High Salinity Water.
abstract: A novel process involving 254 nm UV-C and fructose to degrade pentachlorophenol (PCP), a pollutant, in low and high salinity (0-10 g/L salt) solutions is presented. The first order rate constants in the presence of 0, 300, and 500 mM fructose were 0.23 ± 0.04, 0.54 ± 0.01, and 1.18 ± 0.03 min(-1), respectively. Experimental evidence has shown generation of hydrogen peroxide and singlet oxygen from the UV-C exposure of fructose, which may have accelerated PCP degradation. Although salts (sodium, potassium, and calcium chloride, 1101:6.4:1) are expected to enhance the degradation rate due to generation of reactive halide species (RHS) from exposure to UV-C light, 10 g/L salt decreased the degradation rates in both the absence and presence of fructose. An LC-ESI-MS spectrum of the reaction mixture revealed a high relative abundance at m/z of 215 that corresponds to a fructose-chlorine adduct, indicating that fructose may have scavenged these RHS and prevented their reaction with PCP.
authors.forename: Shaila
authors.initials: S
authors.lastname: Nayak
authors.forename: Sean-Erik
authors.initials: SE
authors.lastname: O'Donnell
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Sales
authors.affiliation: Department of Nutrition and Food Science, University of Maryland-College Park , College Park, Maryland 20742, United States.
authors.forename: Rohan V
authors.initials: RV
authors.lastname: Tikekar
mesh_terms: D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry; D005632:Fructose / Q000737:chemistry; D007700:Kinetics; D010416:Pentachlorophenol / Q000737:chemistry*; D054712:Salinity; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D005632:Fructose; D010416:Pentachlorophenol
keywords: advanced oxidative process; fructose; pentachlorophenol; ultraviolet processing