Removal of Sulfonamides in Water Usingan Electro/Peroxydisulfate System Catalyzedwith Activated Carbon

作者：Nana Wu, Youchen Tan, Hong Qian, Yusi Wang · 发表于：Polish Journal of Environmental Studies · 年份：2018 · DOI：10.15244/pjoes/89542 · 被引用次数：6 · 研究领域：Advanced oxidation water treatment、Electrochemical Analysis and Applications、Advanced Photocatalysis Techniques

Sulfonamides are frequently detected in surface water and groundwater, which have the characteristics of low concentration, high toxicity, and being difficult to remove. In this study, an electro/peroxydisulfate system catalyzed with activated carbon (EC/AC/PS) was used to treat sulfamethoxazole (SMX). The results showed that the removal efficiency of SMX was 88.5% by the EC/AC/PS system. An increase of SMX concentration led to a decrease of SMX degradation efficiency, followed by an increase of intermediate products. Acidic conditions improved the degradation of SMX with optimum pH value of 5. A separate increase of AC concentration, PS concentration, and current density would enhance the degradation efficiency of SMX. But the extent was limited when reaching a certain level. There was an optimum plate spacing of 9 cm for SMX degradation efficiency. After repeating the use of AC 4 times, the removal efficiency of SMX still exceeded 80%. The free radical experiments showed that SO 4