Photodegradation of 4-tert-butylphenol in aqueous solution by UV-C, UV/H2O2 and UV/S2O82− system. Issue 5 (15th April 2016)

• Record Type: Journal Article
• Authors: Wu, Yanlin; Zhu, Xiufen; Chen, Hongche; Dong, Wenbo; Zhao, Jianfu
• Is Part Of: Journal of environmental science and health. Volume 51:Issue 5(2016)
• Page Start: 440
• Page End: 445
• Publication Date: 2016-04-15
• Subjects: 4-tert-butylphenol -- photodegradation -- sulfate radical -- UV/S2O82−; Environmental engineering -- Periodicals; Environmental sciences -- Periodicals; Ecology -- periodicals; Hazardous Substances -- periodicals; 628
• DOI: 10.1080/10934529.2015.1120541
• Languages: English
• ISSNs: 1093-4529

Abstract

ABSTRACT: The photolytic degradation of 4-tert-butylphenol (4-t-BP) in aqueous solution was investigated using three kinds of systems: UV-C directly photodegradation system, UV/H2 O2 and UV/S2 O8 2− system. Under experimental conditions, the degradation rate of 4-t-BP was in the order: UV/S2 O8 2− > UV/H2 O2 > UV-C. The reaction kinetics of UV/S2 O8 2− system were thoroughly investigated. The increase of S2 O8 2− concentration enhanced the 4-t-BP degradation rate, which was inhibited when the concentration of S2 O8 2− exceeded 4.0 mM. The highest efficacy in 4-t-BP degradation was obtained at pH 6.5. The oxidation rate of 4-t-BP could be accelerated by increasing the reaction temperature and irradiation intensity. The highest rate constant ( kobs = 8.4 × 10 −2 min −1 ) was acquired when the reaction temperature was 45°C. The irradiation intensity was measured by irradiation distance, and the optimum irradiation distance was 10 cm. Moreover, the preliminary mechanism of 4-t-BP degradation was studied. The bond scission of the 4-t-BP molecule occurred by the oxidation of SO4 −, which dimerized and formed two main primary products. Under the conditions of room temperature (25°C±1°C) and low concentration of K2 S2 O8 (0.5 mM), 35.4% of total organic carbon (TOC) was removed after 8.5-h irradiation. The results showed that UV/S2 O8 2− system was effective for the degradation of 4-t-BP.