Highly effective adsorption of caffeine by a novel activated carbon prepared from coconut leaf

Highly effective adsorption of caffeine by a novel activated carbon prepared from coconut leaf

The disposal of coconut wastes is costly and damaging to the environment, but its uses are advantageous activated carbons production. Coconut leaves waste were used for activated carbon production by pyrolysis at 500° C and activation with potassium carbonate. The activated carbon was used for caffe...

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Published in:Environmental science and pollution research international Vol. 29; no. 33; pp. 50661 - 50674
Main Authors: Oliveira, Elvio N., Meneses, Alex T., de Melo, Samara F., Dias, Franciele M. R., Perazzini, Maisa T. B., Perazzini, Hugo, Meili, Lucas, Soletti, João I., Carvalho, Sandra H. V., Bispo, Mozart D.
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-07-2022
Springer Nature B.V
Subjects:
Activated carbon
Adsorption
Aquatic Pollution
Aqueous solutions
Artificial neural networks
Atmospheric Protection/Air Quality Control/Air Pollution
Caffeine
Carbon
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Leaves
Neural networks
Parameter identification
Pore size
Potassium carbonate
Pyrolysis
Research Article
Waste Water Technology
Wastewater
Water Management
Water Pollution Control
X-ray diffraction
Kinetic study
Adsorbent
Biochar
Surface area
Carbon
Emerging pollutants
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Summary:The disposal of coconut wastes is costly and damaging to the environment, but its uses are advantageous activated carbons production. Coconut leaves waste were used for activated carbon production by pyrolysis at 500° C and activation with potassium carbonate. The activated carbon was used for caffeine removal from aqueous solution. The coconut leaves activated carbon showed a predominantly amorphous structure from X-ray diffraction analysis and a pH at the zero charge point of 7.9. From the N 2 adsorption/desorption method, the adsorbent showed a predominance of mesopores, with average pore size of 45.48 ηm and a surface area of 678.03 m 2 /g. From kinetic studies the data followed the pseudo-second order, where the intraparticle diffusion can be neglected. The adsorption isotherms were satisfactorily adjusted for the Redlich-Peterson model and a type curve L was identified. The thermodynamic parameters showed that adsorption occurred spontaneously, was exothermic and governed by physical adsorption. The artificial neural networks developed were capable of predicting both kinetics and equilibrium adsorption data under different operating conditions and was comparable to the traditional models available in literature in the training experiments, encouraging its use for data generalization when an efficient dataset is used. In conclusion, coconut leaves waste showed to be a promising feedstock to produce activated carbon aiming caffeine removal from water and wastewater.
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ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-18788-w