Publication:
Inorganic–organic hybrids based on sepiolite as efficient adsorbents of caffeine and glyphosate pollutants

Date

2020

Authors

Baldan Junior, Hugo
Silva Grazziano, Eliane da
Saltarelli, Michelle
Crispim, Denise
Nassar, Eduardo J.
Trujillano, Raquel
Rives, Vicente
Vicente, Miguel Ángel

Director

Publisher

Elsevier
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión publicada / Argitaratu den bertsioa

Project identifier

MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-78863-C2-R
Métricas Alternativas

Abstract

Sepiolite clay mineral was functionalized with (3-chloropropyl)triethoxysilane (ClPTES) or 3-[tri(ethoxy/methoxy)silyl] propylurea (TEMSPU) alkoxides and tested as adsorbent for herbicide glyphosate and also of caffeine, two pollutants with very different chemical composition. The materials obtained were characterized by X-ray diffractometry, infrared spectroscopy, thermal analysis, scanning electron microscopy and nitrogen adsorption at −196 °C, and submitted to toxicity and desorption tests. Silane functional groups blocked sepiolite active positions, and adsorption occurred within the zeolitic channels and on the surface of the functionalized solids. Caffeine and glyphosate effectively interacted with urea groups from grafted alkoxide, which could lower the mobility of the adsorbed contaminants. Glyphosate adsorbed on functionalized sepiolite derivatives showed low toxicity.

Description

Keywords

Caffeine, Clay mineral, Glyphosate, Herbicide, Organically modified sepiolite, Sepiolite

Department

Institute for Advanced Materials and Mathematics - INAMAT2

Faculty/School

Degree

Doctorate program

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