Assessment of Fixed Bed Adsorption of 2,4-D Herbicide onto Modified Bentonite Clay
2022
de Souza, Fernando Manzotti | dos Santos, Onélia Aparecida Andreo
This study evaluated the adsorption of the herbicide 2,4-D in a fixed bed adsorption system using organophilic clay obtained from the chemical modification of sodium bentonite commercialized as Fluidgel®. For this purpose, the operating conditions of the adsorption column were evaluated, such as flow rate (1, 3, and 5 mL min⁻¹) and initial pesticide concentration (10, 20, and 30 mg L⁻¹), and the operational parameters of the bed were calculated for each experimental condition. A flow rate of 1 mL min⁻¹ and initial concentration of 10 mg L⁻¹ were the operational conditions that provided the best operational results for the column, obtaining a rupture time of 1700 min, hMZT of 3.8 cm, and useful and total removal percentages of 96 and 76.6%, respectively. The mathematical models of Thomas and Yoon & Nelson were the most predictive to the breakthrough curves raised, obtaining high correlation coefficient values (R
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