Explaining the adsorption mechanism of the herbicide 2, 4-D and the drug ketoprofen onto wheat husks Fagopyrum esculentum treated with H2SO4. (February 2023)

• Record Type: Journal Article
• Authors: Yanan, Chen; Ali, Jawad; Sellaoui, Lotfi; Dhaouadi, Fatma; Naeem, Muhammad; Franco, Dison S.P.; Georgin, Jordana; Erto, Alessandro; Badawi, Michael
• Is Part Of: Chemosphere. Volume 313(2023)
• Publication Date: 2023-02
• Subjects: Adsorption -- Water pollutants -- Modelling -- Ketoprofen -- 2, 4-D herbicide; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.137355
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this paper, the adsorption of the herbicide 2, 4-D and the drug ketoprofen on wheat husks Fagopyrum esculentum treated with H2 SO4 is experimentally and analytically analyzed. The adsorbent is fully characterized through some techniques such as FT-IR, SEM, and XRD. Adsorption tests are carried out to optimize the performances in terms of adsorbent dosage and solution pH. Subsequently, the impact of temperature is determined through the realization of adsorption isotherms. A multilayer model is employed to microscopically interpret the adsorption mechanism of both the investigated compounds. The modelling analysis shows that the number of molecules bound per adsorption site varied from 0.68 to 2.77 and from 2.23 to 3.59 for ketoprofen and herbicide 2, 4-D, respectively. These estimated values testify that an aggregation process occurs during adsorption. The global number of formed layers of each adsorbate is also determined, showing a significant reduction from 5.73 to 2.61 for ketoprofen and from 1.79 to 1.5 for herbicide 2, 4-D with the temperature. For a complete understanding of the adsorption mechanism, the saturation adsorption capacity and adsorption energy were calculated and interpreted. Overall, it may be inferred that physical interactions govern how these contaminants adsorb on the tested adsorbent. Graphical abstract: Image 1 Highlights: The adsorption of the herbicide 2, 4-D and the drug ketoprofen was investigated. The wheat husks Fagopyrum esculentum was employed as an adsorbent. Application of physical adsorption model to ascribe new interpretations of the adsorption mechanism. Description of the adsorption orientation of both pollutants. Estimation and interpretation of adsorption energies.