Title :

Facile sol–gel synthesis of silica sorbents for the removal of organic pollutants from aqueous media

Author(s) :

Gomes, Ana L.M. [Auteur]
Departamento de Química, Universidade Federal de Minas Gerais
Andrade, Pedro [Auteur]
Departamento de Química, Universidade Federal de Minas Gerais
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Palhares, Hugo G. [Auteur]
Departamento de Química, Universidade Federal de Minas Gerais
Dumont, Marcello R. [Auteur]
Centro Federal de Educação Tecnológica de Minas Gerais [CEFET-MG]
Soares, Daniel C.F. [Auteur]
Universidade Federal de Itajubá = Federal University of Itajubá
Volkringer, Christophe [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Houmard, Manuel [Auteur]
Departamento de Química, Universidade Federal de Minas Gerais
Nunes, Eduardo H.M. [Auteur]
Departamento de Química, Universidade Federal de Minas Gerais

Journal title :

Journal of Materials Research and Technology

Abbreviated title :

Journal of Materials Research and Technology

Volume number :

15

Pages :

4580-4594

Publisher :

Elsevier BV

Publication date :

2021-11

ISSN :

2238-7854

English keyword(s) :

Facile synthesis
Mesoporous silica
Organic pollutants
Water treatment
Adsorption
Thermal regeneration

HAL domain(s) :

Chimie/Chimie inorganique

English abstract : [en]

In this work, silica-based adsorbents were prepared by a facile and straightforward sol–gel route. The adsorption capacity of the prepared materials was investigated using methylene blue (MB) and metamizole (sodium dipyrone ...
Show more >In this work, silica-based adsorbents were prepared by a facile and straightforward sol–gel route. The adsorption capacity of the prepared materials was investigated using methylene blue (MB) and metamizole (sodium dipyrone – DIP) as reference pollutants. We observed that the samples prepared here, regardless of the absence of catalyst, templating agent, or heat treatment step during their preparation, are promising materials for adsorption purposes. The adsorption kinetics was investigated based on the pseudo-first and pseudo-second-order kinetic laws of Lagergren. The most promising sample showed an adsorption capacity of 36.9 mg g−1 (removal capacity of 92.3%) for MB and 8.5 mg g−1 (20.5%) for DIP in aqueous media kept at a pH = 7.0. We observed that the adsorption of these species is strongly associated with the electrostatic interaction between the pollutant molecules and the silica surface. Such an interaction was increased when the pH of the solution increased from 3.0 to 4.5, 7.0, or 9.0. The incorporation of amino groups derived from (3-Aminopropyl)triethoxysilane (APTES) increased the affinity of silica for MB and DIP. These functional groups were incorporated into silica via post-grafting and co-condensation. Furthermore, it was shown that the silica matrices tested here can be easily regenerated by heat treatment in air at 450 °C for periods as short as 15 min, allowing its reuse in subsequent adsorption cycles.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Matériaux hybrides (MATHYB)

Submission date :

2024-01-09T15:17:15Z
2024-01-12T10:58:14Z
2024-01-12T10:59:00Z