Assessment of photo-Fenton and solar photo electro-Fenton processes for the efficient degradation of asulam herbicide

Chemosphere. 2023 Jul 19:139585. doi: 10.1016/j.chemosphere.2023.139585. Online ahead of print.ABSTRACTThe degradation of asulam herbicide by photo electro-Fenton (PEF) and solar photo electro-Fenton (SPEF) processes was studied using an undivided electrochemical BDD/carbon-felt cell to generate H2O2 continuously. Using a central composite design combined with response surface methodology, current intensity = 0.30 A, [Fe2+] = 0.3 mM, and [Na2SO4] = 0.11 M at pH 3 were determined as optimal operating conditions to achieve the complete degradation of asulam by EF. The SPEF process was considered a more efficient treatment in this work than PEF, achieving a complete degradation of asulam and 98% of mineralization in 180 min. Moreover, 4-aminobenzenesulfonamide, 4-aminophenol, and 4-benzoquinone were detected as aromatic intermediates, whereas acetic acid, oxalic acid, and NO3- ions were identified as final degradation by-products. Thus, the SPEF process is an efficient alternative for the complete degradation and mineralization of herbicide asulam in an aqueous solution under natural sunlight.PMID:37478989 | DOI:10.1016/j.chemosphere.2023.139585

Source: Chemosphere - July 21, 2023 Category: Chemistry Authors: H éctor H Vigil-Castillo Edgar J Ruiz Ruiz Khirbet L ópez-Velázquez Laura Hinojosa Reyes Octavio Gaspar-Ram írez Jorge L Guzm án-Mar Source Type: research