Thiabendazole adsorption on montmorillonite, octadecyltrimethylammonium-and Acremonium sp.-loaded products and their copper complexes

GAMBA, M.; OLIVELLI, M.; LÁZARO-MARTÍNEZ, J. M.; GADDI, G.; CURUTCHET, G.; TORRES SÁNCHEZ, R. M.

CHEMICAL ENGINEERING JOURNAL

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2017 vol. 320 p. 11 - 21

1385-8947

This study is a preliminary approach to develop novel montmorillonite (Mt) based adsorbents for removinginorganic and organic contaminants in a step-like process. Biomass (fungi) and surfactant (octadecyltrimethylammoniumbromide) modified montmorillonites (BMt and OMt, respectively) wereobtained. 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 isothermswere performed, and Langmuir, Freundlich and Langmuir-Freundlich mathematical models wereevaluated. 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, leachingexperiments were also conducted.In the BMt sample, TBZ adsorption was enhanced compared to the raw Mt sample. An opposite behaviourwas observed for OMt samples. All the Cu2+-loaded materials showed better TBZ removal efficienciesthan the same materials without Cu2+. Furthermore, Cu2+ chelation through the imidazolic andthiazolic nitrogen atoms of TBZ in all Cu2+-loaded samples allowed TBZ and Cu2+ to be resistant to migrationin environmental leaching conditions.