Removal of sulfamethoxazole, sulfadiazine, and sulfamethazine by UV radiation and HO• and SO4•- radicals using a response surface model and DFT calculations

Environmental Science and Pollution Research International
Luis A J Rodríguez-BlancoRodrigo S Razo-Hernández

Abstract

In this work, the degradation of sulfamethazine (SMT), sulfadiazine (SMD), and sulfamethoxazole (SMX) by using UV light, UV/H2O2, and UV/S2O8-2 was analyzed. Direct photolysis was studied by varying the lamp power and the solution pH. DFT calculations were carried out to corroborate the efficiency of the degradation as a function of the solution pH. The variation of the apparent rate constant, kap, was determined in the indirect photolysis by employing an experimental Box-Behnken-type response surface design. The results evidenced that SMX can be efficiently degraded by applying UV radiation independent of the operating conditions. Nevertheless, the quantum yields for SMT and SMD were close to zero, indicating a low energy efficiency for their photochemical transformation. The effect of the solution pH showed that the photodegradation of sulfonamides depends both on the amount of radiation absorbed as the electronic density. Calculations based on density functional theory and supported by the quantum theory of atoms in molecules allowed to describe fragmentation patterns in the systems under study, proving the lability of S14-C2, N17-C18, and N22-O22 bonds, for SMT, SMD, and SMX, respectively. From response surface methodology,...Continue Reading

References

Feb 1, 1996·Journal of Molecular Graphics·W HumphreyK Schulten
Apr 17, 2007·Water Research·Lanhua HuTimothy J Strathmann
Aug 22, 2007·Water Research·Silvio CanonicaUrs von Gunten
Oct 1, 2011·Journal of Hazardous Materials·Wojciech BaranAndrzej Sobczak
Dec 14, 2011·Journal of Computational Chemistry·Tian Lu, Feiwu Chen
May 24, 2016·Journal of Environmental Management·Jihyun R Kim, Eunsung Kan
Mar 14, 2017·Water Research·Maria Vila-CostaJordi Dachs
Sep 17, 2017·The Science of the Total Environment·Carlos Barrios-EstradaRoberto Parra-Saldívar
Oct 24, 2017·Journal of Environmental Management·Sikandar I MullaChang-Ping Yu
Jul 20, 2018·The Science of the Total Environment·Jianfei Chen, Shuguang Xie
Aug 10, 2018·Journal of Environmental Management·A Acosta-RangelM S Berber-Mendoza
Oct 7, 2018·Journal of Environmental Sciences (China)·Tuqiao ZhangCong Li
Feb 6, 2019·Ecotoxicology and Environmental Safety·Tenghao WangYanbo Zhou
Feb 14, 2020·The Science of the Total Environment·Ruiyang XiaoFeiping Zhao

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