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Enhanced degradation of 2,4-dichlorphenoxyacetic acid herbicide by CaO2 activated by Fe(II) and ultrasound irradiation: Practical insight and mineralization.

Authors :
Eslami, Akbar
Mahdipour, Fayyaz
Maleksari, Hajar Sharifi
Varank, Gamze
Ghasemi, Seyed Mehdi
Nejatian, Parisa
Bagheri, Amin
Madihi-Bidgoli, Soheila
Source :
Korean Journal of Chemical Engineering; Dec2023, Vol. 40 Issue 12, p2866-2875, 10p
Publication Year :
2023

Abstract

CaO<subscript>2</subscript> was activated by Fe(II) and ultrasound (US) irradiation to degrade 2,4-dichlorphenoxyacetic acid (2,4-D) for the first time. Among transition metals (Fe, Cu, Mn and Co), Fe(II) had the best performance for the activation of CaO<subscript>2</subscript>. The impact of pH, CaO<subscript>2</subscript> and Fe(II) concentration was studied, and under optimal situation ∼91% of 2,4-D was degraded during 60 min reaction time. The quenching experiments showed that the hydroxyl radical was the main factor for the destruction of 2,4-D while superoxide anions had a minor role. The bicarbonate ions and acid humic exhibited a strong inhibitory effect on the performance of CaO<subscript>2</subscript>/US/Fe(II) process. Carbon and chlorine mineralization of 2,4-D degradation was investigated; around 41% of C and 35% of Cl were mineralized during 60 min reaction time. The function of CaO<subscript>2</subscript>/US/Fe(II) process was studied on real drainage and other organic pollutants, and the results showed that the CaO<subscript>2</subscript>/US/Fe(II) process can be practical for water treatment. Finally, intermediates of 2,4-D degradation were identified, a pathway was proposed, and the toxicity of intermediates was assessed by ECOSAR software. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02561115
Volume :
40
Issue :
12
Database :
Complementary Index
Journal :
Korean Journal of Chemical Engineering
Publication Type :
Academic Journal
Accession number :
173151100
Full Text :
https://doi.org/10.1007/s11814-023-1405-3