Work

Cyclodextrin–silica hybrid materials: synthesis, characterization, and application in pesticide aqueous removal

Year: 2024

Type: article

Abstract: Introduction: Overusing and misusing pesticides, including paraquat (PQ), have led to numerous environmental contamination complications. PQ is an emerging bio-accumulative contaminant that is present in environmental aqueous matrices. Adsorption techniques are part of a set of technologies applied in ecological remediation, known for their high effectiveness in removing aqueous PQ. A study of the PQ adsorption capacity of three cyclodextrin-silica nanocomposites (α-CDSi, β-CDSi, and γ-CDSi) from contaminated waters is presented in this paper. Methods: The cyclodextrin-silica nanocomposites were synthesized via an esterification reaction between the inorganic matrix and cyclodextrins (CDs) (α, β, and γ) and were characterized physicochemically by spectroscopic, thermal, and surface methods. Their PQ removal performance from contaminated aqueous media was studied under different experimental conditions. Results and Discussion: were found for α-CDSi, β-CDSi, and γ-CDSi, respectively, at only 30 min of treatment. Thermodynamic studies indicated spontaneous and exothermic adsorption processes. The removal assays responded mainly to physisorption mechanisms with contributions from chemisorption mechanisms. Spectroscopic assays showed a strong interaction of PQ with the adsorbents used. Innovative CDSi nanocomposites have proven to be highly efficient in applying aqueous PQ remediation, thus proving to be sustainable adsorbents of contaminants of emerging importance worldwide.

Source: Frontiers in Chemistry

DOI: 10.3389/fchem.2024.1450089

Authors: Estefanía Baigorria, Lucas Bragança Carvalho, Luciana Matos Alves Pinto, Leonardo Fernandes Fraceto

Institutions: Consejo Nacional de Investigaciones Científicas y Técnicas, National University of Mar del Plata, Instituto de Investigaciones en Ciencia y Tecnología de Materiales, Universidade Estadual Paulista (Unesp), Universidade Federal de Lavras

Language: English

Topic: Adsorption and biosorption for pollutant removal

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: gold

Estimated APC paid: $3,295