Inhibitory effect of salinity on the photocatalytic degradation of three sulfonamide antibiotics

• DOI: 10.1016/j.ibiod.2015.01.015
• Publication Date: 2015-03-02T14:47:08Z
• Authors: Chun-Chen Yang; Cheng-Liang Huang; Ta-Chih Cheng; Hong-Thih Lai
• Keywords: Sulfadimethoxine; Sulfonamide; Tylosin

Abstract This study investigates the effects of two salinity treatments (20‰ and 34‰) with seawater on the photocatalytic degradation of sulfonamide antibiotics (SAs). Three SAs, sulfamethoxazole (SMX), sulfamonomethoxine (SMM), and sulfadimethoxine (SDM), were respectively added (50 mg L −1 ) to saline water containing 100 mg L −1 of TiO 2 , and irradiated with ultraviolet (UV) light. The results revealed that the photocatalytic degradation and mineralization of the SAs decreased with an increasing level of salinity treatments. The residual concentrations of the chemical oxygen demand (COD) and dissolved organic carbon (DOC) in the solutions also revealed that SA mineralization decreased with the salinity treatments. The toxicity of the SA solutions to the bioluminescent bacteria, Vibrio fischeri , in the photocatalytic processes increased with the irradiation times, but decreased with an increasing level of salinity treatments. Further study indicated that the inhibitory effects of cations in seawater were Ca 2+ > Mg 2+ > K + > Na + , whereas for anions they were I − > SO 4 2 − > Cl − > Br − .