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- Title
Phenol adsorption onto coffee waste - granular activated carbon: kinetics and equilibrium studies in aqueous solutions.
- Authors
de León-Garza, María de la Luz Díaz; Soto-Regalado, Eduardo; Loredo-Cancino, Margarita; Cerino-Cordova, Felipe de Jesús; García-Reyes, Refugio Bernardo; Dávila-Guzmán, Nancy Elizabeth; Loredo-Medrano, José Ángel
- Abstract
In this research, the production of granular activated carbon from coffee waste (CW) by chemical activation with zinc chloride was studied by using a 2³ factorial design with the three responses (surface area, yield, and hardness) and studying three factors (the activation temperature, activation time, and impregnation ratio). The findings expose that after the experimental design, the highest response values were achieved at an activation temperature of 600°C, an activation time of 40 min, and an impregnation ratio of 1.5 g ZnCl2 g-1 CW. At these conditions, the experimental tests produced a surface area of 1,279 m² g-1. Batch studies of phenol adsorption onto coffee waste-activated carbon (CW-GAC) were performed at different solution pH, stirring speeds, and initial phenol concentrations. The maximum phenol adsorption capacity onto CW-GAC was 160.52 mg g-1 at pH 7. The adsorption kinetics was affected by stirring speed, the required time to achieve equilibrium decreased from 150 to 120 min when stirring speed varied from 200 to 400 min-1. Film and intraparticle diffusion mechanisms controlled the adsorption of phenol onto CW-GAC. Finally, the porous material developed in this research is capable of sequestering phenol from aqueous solutions to a higher extent than similar lignocellulosic-based activated carbons.
- Subjects
COFFEE waste; ACTIVATED carbon; PHENOL; AQUEOUS solutions; ADSORPTION kinetics; ADSORPTION (Chemistry)
- Publication
Desalination & Water Treatment, 2017, Vol 90, p231
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2017.21418