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Article

Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye

1
LAQV/REQUIMTE, Departamento de Química (DQ), Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa (UNL), 2829-516 Caparica, Portugal
2
Unidade de Bioenergia (UB), Laboratório Nacional de Energia e Geologia (LNEG), Estrada do Paço do Lumiar, Ed. J, 1649-038 Lisboa, Portugal
3
LAQV/REQUIMTE, Departamento de Ciências e Tecnologia da Biomassa (DCTB), Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa (UNL), 2829-516 Caparica, Portugal
*
Author to whom correspondence should be addressed.
Received: 10 October 2019 / Revised: 12 November 2019 / Accepted: 14 November 2019 / Published: 18 November 2019
(This article belongs to the Special Issue Carbon Materials for Water Treatment)
A char produced from spent tire rubber showed very promising results as an adsorbent of Remazol Yellow (RY) from aqueous solutions. Spent tire rubber was submitted to a pyrolysis process optimized for char production. The obtained char was submitted to chemical, physical, and textural characterizations and, subsequently, applied as a low-cost adsorbent for dye (RY) removal in batch adsorption assays. The obtained char was characterized by relatively high ash content (12.9% wt), high fixed-carbon content (69.7% wt), a surface area of 69 m2/g, and total pore volume of 0.14 cm3/g. Remazol Yellow kinetic assays and modelling of the experimental data using the pseudo-first and pseudo-second order kinetic models demonstrated a better adjustment to the pseudo-first order model with a calculated uptake capacity of 14.2 mg RY/g char. From the equilibrium assays, the adsorption isotherm was fitted to both Langmuir and Freundlich models; it was found a better fit for the Langmuir model to the experimental data, indicating a monolayer adsorption process with a monolayer uptake capacity of 11.9 mg RY/g char. Under the experimental conditions of the adsorption assays, the char presented positive charges at its surface, able to attract the deprotonated sulfonate groups (SO3) of RY; therefore, electrostatic attraction was considered the most plausible mechanism for dye removal. View Full-Text
Keywords: tire rubber; char; dye; adsorption tire rubber; char; dye; adsorption
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MDPI and ACS Style

Nogueira, M.; Matos, I.; Bernardo, M.; Pinto, F.; Lapa, N.; Surra, E.; Fonseca, I. Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye. C 2019, 5, 76. https://doi.org/10.3390/c5040076

AMA Style

Nogueira M, Matos I, Bernardo M, Pinto F, Lapa N, Surra E, Fonseca I. Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye. C. 2019; 5(4):76. https://doi.org/10.3390/c5040076

Chicago/Turabian Style

Nogueira, Miguel, Inês Matos, Maria Bernardo, Filomena Pinto, Nuno Lapa, Elena Surra, and Isabel Fonseca. 2019. "Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye" C 5, no. 4: 76. https://doi.org/10.3390/c5040076

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