Journal
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
Volume 38, Issue 9, Pages 1285-1294Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2016.1234384
Keywords
Adsorption; Congo red; corn cob based activated carbon (CCAC); kinetics; thermodynamics
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Funding
- World Academy of Science (TWAS) [11-249 RG/CHE/AF/AC_1_UNESCO FR: 3240262674, 15-181 RG/CHE/AF/AC_1_: 3240287083]
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This study investigates the adsorption of Congo red (CR) dye onto corn cob based activated carbon (CCAC) in the batch process. The activated carbon was characterized using FTIR, SEM, and EDX techniques, respectively. The effect of operational parameters such as the initial dye concentration (10-50 mg/L), contact time (5-160 minutes), and solution temperature (30-50 degrees C) were studied. The amount of the CR dye adsorbed was found to increase as these operational parameters increased. Kinetic data for CR dye adsorption onto CCAC were best represented by the pseudo second-order kinetic model. Four different isotherms namely Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models were used to test the adsorption data. It fitted the Langmuir isotherm model most. Thermodynamic parameters such as Delta H-0, Delta S-0, and Delta G(0) were evaluated. The adsorption process was found to be exothermic and spontaneous. The study shows that CCAC is an effective adsorbent for the adsorption of CR dye from aqueous solution.
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