Artículos de revistas
Thiabendazole adsorption on montmorillonite, octadecyltrimethylammonium- and Acremonium sp.-loaded products and their copper complexes
Fecha
2017-03Registro en:
Gamba, Martina; Olivelli, Melisa Soledad; Lazaro Martinez, Juan Manuel; Gaddi, Gisela Marina; Curutchet, Gustavo Andres; et al.; Thiabendazole adsorption on montmorillonite, octadecyltrimethylammonium- and Acremonium sp.-loaded products and their copper complexes; Elsevier Science Sa; Chemical Engineering Journal; 320; 3-2017; 11-21
1385-8947
CONICET Digital
CONICET
Autor
Gamba, Martina
Olivelli, Melisa Soledad
Lazaro Martinez, Juan Manuel
Gaddi, Gisela Marina
Curutchet, Gustavo Andres
Torres Sanchez, Rosa Maria
Resumen
This study is a preliminary approach to develop novel montmorillonite (Mt) based adsorbents for removing inorganic and organic contaminants in a step-like process. Biomass (fungi) and surfactant (octadecyltrimethylammonium bromide) modified montmorillonites (BMt and OMt, respectively) were obtained. In a prior step, Cu2+ was loaded into Mt, BMt and OMt. In a second step, the materials (Mt, Mt-Cu, BMt, BMt-Cu, OMt, OMt-Cu) were used as thiabendazole (TBZ) adsorbents. TBZ adsorption isotherms were performed, and Langmuir, Freundlich and Langmuir-Freundlich mathematical models were evaluated. TBZ removal efficiency of the materials was also tested using three adsorbent dosages. The adsorbents and TBZ-adsorbed products were characterized by X-ray diffraction and thermal analysis, and by electron paramagnetic resonance (EPR) and solid-state nuclear magnetic resonance measurements (ss-NMR). To determine the subsequent arrangement of the adsorption products, leaching experiments were also conducted. In the BMt sample, TBZ adsorption was enhanced compared to the raw Mt sample. An opposite behaviour was observed for OMt samples. All the Cu2+-loaded materials showed better TBZ removal efficiencies than the same materials without Cu2+. Furthermore, Cu2+ chelation through the imidazolic and thiazolic nitrogen atoms of TBZ in all Cu2+-loaded samples allowed TBZ and Cu2+ to be resistant to migration in environmental leaching conditions.