Removal of Sulfonamides in Water Using an Electro/Peroxydisulfate System Catalyzed with Activated Carbon
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School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang, China
China Energy Engineering Corporation Limited, Liaoning Institute, Shenyang, China
Submission date: 2018-01-28
Final revision date: 2018-03-24
Acceptance date: 2018-03-26
Online publication date: 2018-11-16
Publication date: 2019-02-18
Corresponding author
Nana Wu   

Shenyang Jianzhu University, School of Municipal and Environmental Engineering, Shenyang Jianzhu University, No.9 Hunnan East Road, Hunnan District, 110168 Shenyang, China
Pol. J. Environ. Stud. 2019;28(3):1957-1965
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 SO4•- played a leading role. The benzene ring structure of SMX was gradually decomposed with reaction. According to data analysis, the reaction kinetic model was Ct = C0exp(-1.100×10-3[AC]0.4471[PS]0.6397[current density]0.5658[plate spacing]0.8405t). This study implied that the EC/AC/PS process could effectively remove sulfonamide antibiotics in water, which was an environmentally friendly treatment method.
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