Journal of Chemistry
Volume 2016, Article ID 8358960, 5 pages
http://dx.doi.org/10.1155/2016/8358960
Photodegradation of Sulfadiazine in Aqueous Solution and the Affecting Factors
Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of the People’s Republic of China, 8 Jiangwangmiao Street, Nanjing 210042, China
Received 29 March 2016; Revised 7 June 2016; Accepted 13 June 2016
Academic Editor: Athanasios Katsoyiannis
Copyright © 2016 Xuesen Bian and Jibing Zhang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Knowledge about photochemical behavior of sulfonamides under UV light is limited. In this study, photodegradation of sulfadiazine in water by ultraviolet (UV) light was studied using a 300 W, 365 nm UV lamp. The degradation process followed well the first-order kinetics, with a half-life of 9.76 min in water with air saturation. The photodegradation was slower at acidic pH 4.52 than at pH 6.98 and pH 8.90. Addition of H2O2 and nitrate enhanced the photodegradation rate, while addition of ethanol, nitrite, sulfate, and bicarbonate depressed the reaction rate. This study suggested that sulfadiazine photodegradation under UV light is generally favored by the attack of hydroxyl radicals.