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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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

Received: 22 February 2023

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X703.1

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	ZHOU Die
	LIU Hua-ying
	WANG Nian
	ZHANG Tan
	TU Yi-na
	LI Ying-jie

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ZHOU Die,LIU Hua-ying,WANG Nian等. Effect of CO₃^-• on the degradation kinetics of sulfapyridine in UV/PMS system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4585-4595.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4585

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