[张贴报告]Study on the catalytic degradation mechanism of tetracycline by activated peroxymonosulfate with nano zero-valent iron walnut shell activated carbon

Study on the catalytic degradation mechanism of tetracycline by activated peroxymonosulfate with nano zero-valent iron walnut shell activated carbon
编号:3071 稿件编号:3775 访问权限:私有 更新:2023-04-12 20:03:27 浏览:182次 张贴报告

报告开始:2023年05月06日 08:00 (Asia/Shanghai)

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所在会议:[SP] 张贴报告专场 » [SP-5-1] 5、环境科学

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摘要
    In this study, nano zero-valent iron (nZVI) was loaded onto walnut shell activated carbon by liquid phase reduction method to synthesize nanocomposites (WS-AC/nZVI), which was used as a catalyst to activate PMS to efficiently degrade tetracycline in solution. The results showed that under the conditions of TC concentration of 100 ppm, PMS dosage of 0.2 mM, and WS-AC/ nZVI dosage of 0.1 g/L, the TC removal rate could reach 81 %. Based on quenching experiments and electron spin resonance (EPR), it was verified that the •OH, SO4•− and 1O2 bound on the catalyst surface were the main reactive oxygen species during the reaction. The intermediates of TC were identified by UPLC-MS and DFT, and the possible degradation pathway of TC was deduced. The degradation mechanism of TC was comprehensively evaluated by Fukui function, ALIE and three-dimensional ESP analysis. The catalyst still maintained a high TC removal efficiency after four cycles of experiments, and the minimal iron loss on the surface of the catalyst indicated its good stability. The efficient and stable WS-AC/nZVI activated PMS showed great potential for degradation of antibiotics.
 
关键字
Nano zero-valent iron (nZVI); Tetracycline (TC); Potassium persulfate (PMS); Activation; Recyclability.
报告人
段萍萍
硕士研究生 青岛大学

稿件作者
段萍萍 青岛大学
崔育倩 青岛大学
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