@article {c5040076,
	title = {Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye},
	journal = {C{\textemdash}Journal of Carbon Research},
	volume = {5},
	number = {4},
	year = {2019},
	note = {n/a},
	abstract = {<p>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\&minus;) of RY; therefore, electrostatic attraction was considered the most plausible mechanism for dye removal.</p>
},
	issn = {2311-5629},
	doi = {10.3390/c5040076},
	url = {https://www.mdpi.com/2311-5629/5/4/76},
	author = {Nogueira, Miguel and Matos, In{\^e}s and Bernardo, Maria and Filomena Pinto and Nuno Lapa and Elena Surra and Fonseca, Isabel}
}
