Analysis and Simulation of Adsorption Efficiency of Herbicides Diuron and Linuron on Activated Carbon from Spent Coffee Beans

Phenyl urea herbicides such as diuron and linuron are commonly used in agriculture to eliminate weeds. Their uncontrolled use can cause environmental problems. In this study, the adsorption of these herbicides was evaluated using activated carbon from coffee grounds, activated with zinc chloride (AC...

Full description

Saved in:
Bibliographic Details
Published in:Processes 2024-09, Vol.12 (9), p.1952
Main Authors: Moraes, Luiz Eduardo Zani de, Marcoti, Felipe Augusto Olivo, Lucio, Marco Antônio Naves, Rocha, Bianca Caroline da Silva, Rocha, Lucas Bonfim, Romero, Adriano Lopes, Bona, Evandro, Peron, Ana Paula, Junior, Osvaldo Valarini
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Adsorption
Analysis
Coffee
Diuron
Efficiency
Environmental impact
Herbicides
Industrial wastes
Insecticides
Linuron
Methylene blue
Molecular weight
Nitric acid
Personal grooming
Pesticides
Pharmaceuticals
Pollutants
Purity
Temperature
Toxicity
Water resources
Zinc chloride
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Phenyl urea herbicides such as diuron and linuron are commonly used in agriculture to eliminate weeds. Their uncontrolled use can cause environmental problems. In this study, the adsorption of these herbicides was evaluated using activated carbon from coffee grounds, activated with zinc chloride (AC-ZnCl2, 100% purity), nitric acid (AC-HNO3, 65% purity), and commercially activated (AC-C) carbon for comparison purposes. The spent coffee grounds were transformed into activated carbon through the calcination process. The highest removal efficiency for diuron 40 mg∙L−1 and linuron 31 mg∙L−1 was obtained using the ZnCl2-activated adsorbent, being 100% and 45%, respectively. The best pH range was between 4 and 6. Adsorption kinetic studies showed that pseudo-first and second-order models fit the experimental data, with the adsorption rate increasing rapidly within 60 min for the concentrations tested. Adsorption isotherms indicated that the Langmuir model provided the best fit for diuron, while the Freundlich model was more appropriate for linuron. The efficiency of the adsorption process using activated carbon (AC) was confirmed by the toxicity analysis of diuron and linuron solutions before and after adsorption with AC.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr12091952