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Fast regeneration of activated carbons saturated with textile dyes: Textural, thermal and dielectric characterization

Durán-Jiménez, Gabriela; Stevens, Lee A.; Hodgins, Genevieve R.; Uguna, Jacob; Ryan, John; Binner, Eleanor R.; Robinson, John P.

Authors

Gabriela Durán-Jiménez

Lee A. Stevens

Genevieve R. Hodgins

Jacob Uguna

John Ryan

Eleanor R. Binner

John P. Robinson

Abstract

This study presents an investigation for comparing the regeneration process of two activated carbons saturated with Basic Blue 9 (BB9) and Acid Blue 93 (AB93) using conventional (250–500 °C) and microwave heating (100–300 W). The effect of the textile dye used on the regeneration performance was analyzed by determining their dielectric properties using the perturbation cavity method from 20 to 600 °C and by TG/DTG analysis. The efficacy of the regenerated carbons was investigated by their physical properties characterized by pore structural analysis using N2 adsorption isotherms. Results showed only 3 min are required by microwaves to achieve similar textural parameters obtained by conventional heating at 190 min. The results indicate that the adsorbate plays a determining role on the regeneration efficiency as results of their interaction with the adsorbent, being easily regenerated when AB93 is the adsorbate. The adsorption capacity of microwave regenerated samples for AB93 and BB9 was 192–240 and 154–175 mg/g, respectively. Additionally, the equilibrium isotherms were simulated using the Langmuir and Freundlich isotherms models and the results suggest the textile dye removal is achieved on multilayer adsorption.

Journal Article Type Article
Publication Date Dec 15, 2019
Journal Chemical Engineering Journal
Print ISSN 1385-8947
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 378
Article Number 121774
DOI https://doi.org/10.1016/j.cej.2019.05.135
Keywords Industrial and Manufacturing Engineering; General Chemistry; General Chemical Engineering; Environmental Chemistry
Publisher URL https://www.sciencedirect.com/science/article/pii/S1385894719311593?via%3Dihub

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