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

• Published in: The Korean journal of chemical engineering Vol. 40; no. 12; pp. 2866 - 2875
• Main Authors: Eslami, Akbar, Mahdipour, Fayyaz, Maleksari, Hajar Sharifi, Varank, Gamze, Ghasemi, Seyed Mehdi, Nejatian, Parisa, Bagheri, Amin, Madihi-Bidgoli, Soheila
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2023; Springer Nature B.V; 한국화학공학회
• Subjects: Bicarbonates; Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Chlorine; Copper; Degradation; Environmental Engineering; Herbicides; Hydroxyl radicals; Industrial Chemistry/Chemical Engineering; Iron; Irradiation; Manganese; Materials Science; Mineralization; Reaction time; Transition metals; Ultrasonic imaging; Water treatment; 화학공학; Fenton Oxidation; Calcium Peroxide; Toxicity Evaluation; Mineralization; Herbicide
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-023-1405-3

CaO 2 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 2 . The impact of pH, CaO 2 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 2 /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 2 /US/Fe(II) process was studied on real drainage and other organic pollutants, and the results showed that the CaO 2 /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.