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.

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.

Citation

Durán-Jiménez, G., Stevens, L. A., Hodgins, G. R., Uguna, J., Ryan, J., Binner, E. R., & Robinson, J. P. (2019). Fast regeneration of activated carbons saturated with textile dyes: Textural, thermal and dielectric characterization. Chemical Engineering Journal, 378, Article 121774. https://doi.org/10.1016/j.cej.2019.05.135

• Journal Article Type: Article
• Acceptance Date: May 20, 2019
• Online Publication Date: May 21, 2019
• Publication Date: Dec 15, 2019
• Deposit Date: Jul 11, 2019
• Publicly Available Date: May 22, 2020
• 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
• Public URL: https://nottingham-repository.worktribe.com/output/2299476
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S1385894719311593?via%3Dihub