UV/PMS体系中CO<sub>3</sub><sup>-•</sup>对磺胺吡啶降解动力学的影响

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摘要以污水中检出频率较高的磺胺吡啶(SPD)为目标化合物,探究了HCO₃^-对紫外/过硫酸盐(UV/PMS)体系中SPD降解的影响,详细探讨了HCO₃^-浓度､pH值､SPD浓度和溶解有机质(DOM)对SPD降解的影响.通过构建自由基动力学模型,探明不同环境条件下CO₃^-•对SPD降解的影响及贡献.研究发现, NaHCO₃的加入促进了SPD的降解,表观降解速率常数(k)增加了1倍;随着溶液初始pH值增加(5~8), SPD的k值提高了约3倍;随着SPD初始浓度(5~25μmol/L)和HA(0~20mg C/L)的增加, k值分别下降了约81%､84%.构建的自由基动力学模型可较好的预测不同水基质中UV/PMS氧化降解SPD的速率常数,误差范围0.44%~5.53%;该模型表明CO₃^-•在SPD的UV/PMS氧化降解中起到不可忽视的作用,随着HCO₃^-浓度和pH值的增加其贡献逐渐增强,最高可达34%;随着SPD初始浓度和HA浓度增加,其贡献由34%分别逐渐下降至9%和17%.

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	周碟
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关键词 ：高级氧化法, 磺胺吡啶, HCO₃^-, 碳酸根自由基, 动力学模型

Abstract：Take sulfapyridine (SPD), which is detected frequently in sewage, as the target compound to explore the effect of HCO₃^- on the degradation of SPD in the UV/PMS system, and discussed the effects of HCO₃^- concentration, pH, SPD concentration and dissolved organic matter (DOM) on the degradation of SPD in detail. By constructing a free radical kinetic model, the influence and contributions of CO₃^-• on the degradation of SPD under different environmental conditions were explored. It was found that the addition of NaHCO₃ promoted the degradation of SPD, and the apparent degradation rate constant (k) doubled; and with the initial pH value of the solution increasing (5~8), the k value of SPD increased by about 3times; and with the initial concentration of SPD (5~25μmol/L) and the increase of HA (0~20mg C/L), so k value decreased by about 81% and 84% respectively. The constructed free radical kinetic model could better predict the rate constant of UV/PMSoxidative degradation of SPD in different water substrates, with an error range of 0.44%~5.53%. The model showed that CO₃^-• played an important role in the UV/PMSoxidative degradation of SPD, and its contribution gradually increased with the increase of HCO₃^-concentration and pH, upped to 34%. With the increase of the initial concentration of SPD and the concentration of HA, their contributions gradually decreased from 34% to 9% and 17% respectively.

Key words： advanced oxidation process sulfapyridine HCO₃^- carbonate radical kinetic model

收稿日期: 2023-02-22

PACS:

X703.1

基金资助:国家自然科学基金资助项目(22266020)

通讯作者: 刘华英,讲师,liuhuaying86@sina.com;李英杰,副教授,yjli@kmust.edu.cn E-mail: liuhuaying86@sina.com;yjli@kmust.edu.cn

作者简介: 周碟(1998-),女,贵州岑巩人,硕士研究生,主要研究方向为典型高级氧化过程中碳酸根自由基对污水中抗生素的降解潜势研究.发表论文1篇.kust20212207087@163.com

引用本文:

周碟, 刘华英, 汪念, 张倓, 屠依娜, 李英杰. UV/PMS体系中CO₃^-•对磺胺吡啶降解动力学的影响[J]. 中国环境科学, 2023, 43(9): 4585-4595. ZHOU Die, LIU Hua-ying, WANG Nian, ZHANG Tan, TU Yi-na, LI Ying-jie. Effect of CO₃^-• on the degradation kinetics of sulfapyridine in UV/PMS system. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4585-4595.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I9/4585

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