Titania-triethanolamine-kaolinite nanocomposites as adsorbents and photocatalysts of herbicides

Date

2021

Authors

Ferreira, Ana Vera de Toledo Piza Figueiredo
Barbosa, Lorrana Vietro
Souza, Suelen Delfino de
Ciuffi, Katia J.
Vicente, Miguel Ángel
Trujillano, Raquel
Faria, Emerson H. de

Director

Publisher

Elsevier
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión aceptada / Onetsi den bertsioa

Project identifier

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

Abstract

Kaolinite-titania adsorbents/photocatalysts were prepared by functionalizing a kaolinite with titanium(IV) triethanolaminate isopropoxide by the sol–gel route. These materials were characterized by various techniques and applied in adsorption studies (kinetic and equilibrium) of the herbicides diuron, hexazinone, and tebuthiuron. Photodegradation studies were also conducted with the materials submitted to heat-treatment at 400, 700, or 1000 °C. The basal spacing increased from 0.71 to 1.08 nm when pure kaolinite was functionalized with titanium triethanolaminate units. The materials displayed FTIR bands of –CH, –NH2, and Ti–OH groups, thereby confirming that titanium alkoxide was present in the kaolinite interlayer space. The pseudo second-order model was the best for describing the kinetic adsorption process. In the equilibrium study, the Langmuir model best described the adsorption mechanism. The photodegradation studies showed that the kaolinite-titania nanocomposites heat-treated at 400 and 700 degraded diuron, hexazinone, and tebuthiuron efficiently due to the presence of metakaolin and formation of the anatase phase. © 2021 Elsevier B.V.

Description

Keywords

Advanced oxidative process, Clay minerals, Functionalization, Herbicides, Removal

Department

Zientziak / Institute for Advanced Materials and Mathematics - INAMAT2 / Ciencias

Faculty/School

Degree

Doctorate program

item.page.cita

A. Vera de Toledo Piza Figueiredo Ferreira, L. Vietro Barbosa, S. Delfino de Souza, K. Jorge Ciuffi, M. Angel Vicente, R. Trujillano, S.A. Korili, A. Gil, E. Henrique de Faria, Titania-triethanolamine kaolinite nanocomposites as adsorbents and photocatalysts of herbicides, Journal of Photochemistry & Photobiology, A: Chemistry (2021), doi: https://doi.org/10.1016/j.jphotochem.2021.113483

item.page.rights

© 2021 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0

Licencia

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