Citation: Wang Yanping, Zhou Chengzhi, Wu Jinhua, Niu Junfeng. Insights into the electrochemical degradation of sulfamethoxazole and its metabolite by Ti/SnO₂-Sb/Er-PbO₂ anode[J]. Chinese Chemical Letters, ;2020, 31(10): 2673-2677. doi: 10.1016/j.cclet.2020.03.073 shu

Insights into the electrochemical degradation of sulfamethoxazole and its metabolite by Ti/SnO₂-Sb/Er-PbO₂ anode

a.
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
b.
Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China

zhoucz@dgut.edu.cn

Received Date: 21 January 2020
Revised Date: 3 March 2020
Accepted Date: 28 March 2020
Available Online: 10 April 2020

Figures(4)

Electrochemical degradation of sulfamethoxazole (SMX) and its metabolite acetyl-sulfamethoxazole (Ac-SMX) by Ti/SnO₂-Sb/Er-PbO₂ were investigated. Results indicated that the electrochemical degradation of SMX and Ac-SMX followed pseudo-first-order kinetics. The rate constants of SMX and Ac-SMX were 0.268 and 0.072 min^-1 at optimal current density of 10 and 14 mA/cm², respectively. Transformation products of SMX and Ac-SMX were identified and the possible degradation pathways, including the cleavage of S-N bond, opening ring of isoxazole and nitration of amino group, were proposed. Total organic carbon removal of SMX was nearly 63.2% after 3 h electrochemical degradation. 22.4% nitrogen of SMX was transformed to NO₃^-, and 98.8% sulfur of SMX was released as SO₄^2-. According to quantitative structure-activity relationship model, toxicities of SMX and Ac-SMX to aquatic organisms significantly decreased after electrochemical degradation. Electric energy consumption for 90% SMX and Ac-SMX degradation was determined to be 0.58-8.97 and 6.88-44.19 Wh/L at different experimental conditions, respectively. Compared with parent compound SMX, the metabolite Ac-SMX is more refractory and toxic, which emphasizes the importance of taking its metabolites into account when investigating the disposal of pharmaceuticals from wastewater.
- Electrochemical degradation,
- Sulfamethoxazole and metabolite,
- Degradation mechanism,
- Quantitative structure-activity relationship
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Insights into the electrochemical degradation of sulfamethoxazole and its metabolite by Ti/SnO2-Sb/Er-PbO2 anode

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通讯作者: 陈斌, bchen63@163.com

Insights into the electrochemical degradation of sulfamethoxazole and its metabolite by Ti/SnO₂-Sb/Er-PbO₂ anode