R. Shokoohi, M. Salari, A. Arabkoohsar
Nov 5, 2018
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Journal
Journal of Kermanshah University of Medical Sciences
Abstract
Background: Used in the dyeing industry, Acid Green 3 has a complicated molecular structure and a low level of biodegradability. The present study investigated the removal of Acid Green 3 from synthetic solutions by UV/S 2 O 8-2 . Methods: This cross-sectional study was conducted at the laboratory scale. The effect of time (5 - 60 min), pH (3 - 11), Acid Green 3 concentration (50 - 150 mg/L), and dose of S 2 O 8 (10 - 50 mg/L) was studied under the UV radiation with 510 mJ/cm 2 intensity and 636 nm wavelength. Spectrophotometer (wavelength of 636 nm) was used to measure remaining concentration of Acid Green 3 after each experiment. Linear regression was used to create an appropriate linear model. Results: Results showed a removal percentage of 95% was achieved under the optimal conditions of the studied variables: pH = 3, Acid Green 3 = 50 mg/L, S 2 O 8-2 = 50 mg/L and time = 60 min. The kinetics of UV/S 2 O 8-2 process for all the investigated variables followed the pseudo-first-order kinetic model. In addition, the removal efficiency of COD for Acid Green concentrations of 50, 100, and150mg/Lwereabout78%,53%,and41%,respectively. LinearregressionanalysisyieldedamodelwithR 2 =0.852andadjustedR 2 = 0.792. Conclusions: Inthecurrentstudy,thevariablesof AcidGreen3,S 2 O 8-2 ,contacttime,andpHwereeffectiveontheprocessefficiency. Regarding the high efficiency of UV/S 2 O 8-2 , this process could be employed for the removal of Acid Green 3 and similar compounds from industrial effluents.