Electrochemical degradation of sulfonamides at BDD electrode: Kinetics, reaction pathway and eco-toxicity evaluation
Electrochemical degradation of sulfonamides at BDD electrode: Kinetics, reaction pathway and eco-toxicity evaluation
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DOI：
10.1016/j.jhazmat.2014.08.050
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发表时间：
2014-09-15
影响因子：
13.6
通讯作者：
Siedlecka, Ewa Maria
中科院分区：
文献类型：
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作者：
Fabianska, Aleksandra;Bialk-Bielinska, Anna;Siedlecka, Ewa Maria
该研究涉及五种磺酰胺 (SN)：磺胺嘧啶 (SDZ)、磺胺噻唑 (STZ)、磺胺甲基嘧啶 (SMR)、磺胺二甲嗪 (SMN) 和磺胺二甲氧嘧啶 (SDM) 在硼掺杂金刚石 (BDD) 电极上在水溶液中的电化学氧化。所有研究的磺胺类药物均按照伪一级动力学降解。 SN的结构对伪一阶速率常数的值没有显着影响。在较高温度和酸性 pH 条件下观察到降解效率增加。由于氯和硝酸盐的存在，城市废水处理厂 (WWTP) 废水中的 SN 比纯支持电解质 Na2SO4 中的氧化更有效。 LC-MS和GC-MS分析鉴定的中间体表明，羟基自由基主要攻击SNs的S-N键，但也攻击SNs的芳环系统（苯胺、嘧啶或三唑）。最后，通过测量绿藻（Scenedesmus vacualatus）和浮萍（Lemnaminor）的生长抑制来评估电化学处理后的SNs溶液和废水的毒性。观察L.minor试验中电化学氧化前后SMR、STZ、SMN溶液和处理后SDM溶液的毒性。在藻类测试中没有观察到所研究的SNs的显着毒性。 (C) 2014 年由 Elsevier B.V. 出版
The investigation dealt with electrochemical oxidation of five sulfonamides (SNs): sulfadiazine (SDZ), sulfathiazole (STZ), sulfamerazine (SMR), sulfamethazine (SMN) and sulfadimethoxine (SDM) in aqueous solution at boron-doped diamond (BDD) electrode. All studied sulfonamides were degraded according to a pseudo first order kinetics. The structure of SNs had no significant effect on the values of pseudo first order rate constants. Increased degradation efficiency was observed in higher temperature and in acidic pH. Due to the presence of chlorine and nitrate SNs were more effectively oxidized from municipal wastewater treatment plant (WWTP) effluents than from pure supporting electrolyte Na2SO4. The intermediates identified by LC-MS and GC-MS analysis suggested that the hydroxyl radicals attack mainly the S-N bond, but also the aromatic ring systems (aniline, pyrimidine or triazole) of SNs. Finally, the toxicity of the SNs solutions and effluents after electrochemical treatment was assessed through the measurement of growth inhibition of green algae (Scenedesmus vacualatus) and duckweed (Lemna minor). Toxicity of SMR, STZ, SMN solutions before and after electrochemical oxidation and SDM solution after the process in L. minor test was observed. No significant toxicity of studied SNs was observed in algae test. (C) 2014 Published by Elsevier B.V.