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Degradation of dicamba – a persistent herbicide - by combined application of formic acid and UV as an advanced reduction process
Abstrakt
The degradation of dicamba as a persistent herbicide was studied with the combined application of UV and formic acid (FA) as a novel advanced reduction process (ARP). The effects of key parameters of FA concentration, dissolved organic matter, and inorganic anions were studied. A 97 % degradation and 94 % dechlorination of dicamba were obtained through the combination of UV and FA (UV-FA) at a dicamba concentration of 0.023 mM and FA concentration of 0.123 M. With respect to the dechlorination, at a dicamba concentration of 0.23 mM, FA concentration of 0.123 M, and pH of 2, chloride concentration of 12.4 mg/L and 5.2 mg/L was obtained for ARP (UV-FA) and sole UV in acidic condition, respectively. Scavenging test using Methyl viologen (MV2 +) as a scavenger for reductive radicals including carboxyl anion radicals (CO2•¯) led to a decrease in the chloride concentration to 1.7 mg/L, revealing the importance of this radical in the dechlorination of dicamba. Inorganic anions (CO32¯ and SO42¯) had a slightly positive effect on the degradation of dicamba and led to an increase in degradation to 99 %, while they had a negative effect on the dechlorination by 7 % and 30 %, respectively. Due to the turbidity induced by dissolved organic matters (DOM), a moderate decrease in degradation by 39 % and dechlorination by 30 % was observed. The existence of five intermediates identified by GC-MS technique confirmed the proposed mechanism of dicamba degradation via ARP. Reductive degradation of dicamba mainly consists of processes based on CO2•¯, including single electron transfer process and radical-nucleophilic aromatic substitution (SRN) reactions, demonstrating the capability of this ARP for the effective degradation of dicamba.
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Autorzy (5)
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Chongqing Wang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
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Pełna treść
- Wersja publikacji
- Accepted albo Published Version
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.jhazmat.2025.137984
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Informacje szczegółowe
- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuły w czasopismach
- Opublikowano w:
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JOURNAL OF HAZARDOUS MATERIALS
nr 492,
ISSN: 0304-3894 - Język:
- angielski
- Rok wydania:
- 2025
- Opis bibliograficzny:
- Askarniya Z., Cichocki Ł., Makowiec S., Wang C., Boczkaj G.: Degradation of dicamba – a persistent herbicide - by combined application of formic acid and UV as an advanced reduction process// JOURNAL OF HAZARDOUS MATERIALS -Vol. 492, (2025), s.137984-
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.jhazmat.2025.137984
- Źródła finansowania:
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- IDUB
- Projekt Badania hybrydowych zaawansowanych procesów redukcji
- Weryfikacja:
- Politechnika Gdańska
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