Oxidation of Sulfonamides in Aqueous Solution by UV-TiO2-Fe(VI)

BioMed Research International
Yan MaNai-Yun Gao

Abstract

The photocatalytic degradation of sulfonamides in aqueous TiO2 suspension under UV irradiation has been investigated using potassium ferrate as electron acceptors. The results showed that the stability of Fe(VI) is dependent on pH significantly, and the stability reduces obviously in the presence of UV-TiO2. The experiments indicated that Fe(VI) could effectively scavenge the conduction band electrons from the surface of TiO2. The photocatalytic oxidation of sulfonamides with Fe(VI) was found to be much faster than that without Fe(VI). The SD, SM, and SMX concentration was greatly reduced by 89.2%, 83.4%, and 82.0%, respectively, after 10 min with UV-TiO2-Fe(VI), comparing to 65.2%, 66.0%, and 71.9%, respectively, with Fe(VI) only in the dark and 71.3%, 72.7%, and 76.0%, respectively, with UV-TiO2. The pH value of solution significantly influenced the sulfonamides degradation in UV-TiO2-Fe(VI) system. The degradation amount of sulfonamides after 10 min was a maximum at pH 7. The intermediate products of sulfonamides oxidation by UV-TiO2-Fe(VI) were analysed by LC-HESI-MS-MS and the results suggested that a majority of sulfonamides turned into large-molecule products without complete mineralization.

References

Aug 10, 2004·Environmental Science & Technology·Anne L BoreenKristopher McNeill
May 2, 2006·Environmental Science & Technology·Francesco PomatiDavide Calamari
Feb 20, 2007·Water Science and Technology : a Journal of the International Association on Water Pollution Research·C Li, X Z Li
May 29, 2007·Journal of Hazardous Materials·J Q Jiang
Nov 6, 2007·Water Research·Bao-Ling YuanNigel Graham
Jan 31, 2009·Chemosphere·Klaus Kümmerer
Feb 3, 2009·Chemosphere·Klaus Kümmerer
Jan 26, 2010·Journal of Hazardous Materials·Oscar RozasHéctor D Mansilla
Jan 5, 2011·Journal of Environmental Management·Virender K Sharma

❮ Previous
Next ❯

Citations

Jun 1, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Shunping FangHaiqun Chen
Mar 31, 2020·Environmental Science and Pollution Research International·Olivier MonfortGilles Mailhot

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cardiac Conduction System

The cardiac conduction system is a specialized tract of myocardial cells responsible for maintaining normal cardiac rhythm. Discover the latest research on the cardiac conduction system here.