Simulated solar driven photolytic ozonation for the oxidation of aqueous recalcitrant-to-ozone tritosulfuron. Transformation products and toxicity

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:233

Article

Solis, Rafael R.^1,2  Gimeno, Olga^1,2  Javier Rivas, F.^1,2  Beltran, Fernando J.^1,2 

[1] Univ Extremadura, Dept Ingn Quim & Quim Fis, Avda Elvas S-N, Badajoz 06006, Spain

[2] Univ Extremadura, Inst Univ Agua Cambia Climat & Sostenbilidad IACY, Avda Invest S-N, Badajoz 06006, Spain

关键词: Ozone;    Simulated solar radiation;    Tritosulfuron;    Transformation products;    Toxicity;   

DOI  :  10.1016/j.jenvman.2018.12.068

来源: Elsevier

【 摘 要 】

This work reports the combination of ozone and solar radiation as an advanced oxidation process to remove the herbicide tritosufuron (TSF) in water. Firstly, the recalcitrance of TSF has been assessed, obtaining an ozonation second order rate constant of 5-154 M(-1)min(-1) in the range of pH from 5 to 8; while the rate constant with HO center dot was found to be (1.8-3.1).10(9) M(-1)s(-1). Secondly, the simultaneous application of simulated solar radiation in between 300 and 800 nm and ozone resulted positive in the oxidation rate of TSF. Mineralization extent was also higher. Less effective oxidation was achieved after limiting the radiation to the range 360-800 nm or 390-800 sun; also completely inappropriate for mineralization. Thirdly, the detected transformation products (TPs) demonstrated the vulnerability of TSF molecule to be attacked by HO center dot in the sulfonylurea bridge. The combination of ozone and radiation of 300-800 nm led to the most effective removal of the TPs. Finally, after the photolytic ozonation treatment toxicity was also evaluated in terms of phytotoxicity towards the germination and root elongation of Lactuca Sativa seeds, and toxicity by immobilization tests of Daphnia Magna.

【 授权许可】

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