Hydrogen peroxide-assisted UV photodegradation of Lindane.
Aqueous solutions of gamma-hexachlorocyclohexane (Lindane) were photolyzed (lambda=254 nm) under a variety of solution conditions. The initial concentrations of hydrogen peroxide (H(2)O(2)) and Lindane varied from 0 to 20 mM and 0.21 to 0.22 microM, respectively, the pH ranged from 3 to 11, and several concentration ratios of Suwannee River humic acid and fulvic acid were dissolved in the irradiated solutions. Lindane rapidly reacted, and the maximum reaction rate constant (9.7 x 10(-3) s(-1)) was observed at pH 7 and initial [H(2)O(2)]=1 mM. Thus, 90% of the Lindane is destroyed in approximately 4 min under these conditions. In addition, within 15 min, all chlorine atoms were converted to chloride ion, indicating that chlorinated organic by-products do not accumulate. The reactor was characterized by measuring the photon flux (7.04 x 10(-6) E s(-1)) and the cumulative production of *OH during irradiation. The cumulative *OH production during irradiation was fastest at an initial [H(2)O(2)]=5 mM (k=0.77 micro M s(-1)).
Purdue University, School of Civil Engineering, 550 Stadium Mall Drive, West Lafayette, United States.
Amanda M
AM
Nienow
Juan Cesar
JC
Bezares-Cruz
Irene C
IC
Poyer
Inez
I
Hua
Chad T
CT
Jafvert
D001556:Hexachlorocyclohexane / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods*; D010782:Photolysis / Q000528:radiation effects; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry
D014874:Water Pollutants, Chemical; D001556:Hexachlorocyclohexane; D006861:Hydrogen Peroxide