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Adsorption of Methylene Blue onto Microwave Assisted Zinc Chloride Activated Carbon Prepared from Delonix Regia Pods - Isotherm and Thermodynamic Studies

Author Affiliations

  • 1Department of Chemistry, Arasu Engineering College, Kumbakonam, Tamilnadu, INDIA
  • 2Department of Chemistry, Sri Manakula Vinayagar Engineering College, Pondicherry, INDIA
  • 3Department of Chemistry, A.V.V.M Sri Pushpam College, Poondi, Tamilnadu, INDIA

Res.J.chem.sci., Volume 4, Issue (7), Pages 36-42, July,18 (2014)


Delonix regia (Flame tree) pods were utilized to prepare activated carbon by using orthogonal array experimental design method with the parameters such as microwave radiation power, radiation time, concentration of ZnClimpregnation time. Optimized conditions were found to be raimpregnation time 24 hours. Carbon prepared was designated as MWZAC (Microwave assisted Zinc chloride Activated Carbon). The characteristics of the MWZAC were determined by BET analysis and pHZPCMethylene blue dye from aqueous solution by batch mode adsorption technique.dye concentration and temperature on adsorption was studiedTempkin, Dubinin-Raduskevich, Harkins -on R2 value. Various thermodynamic parameters such as ΔH, ΔS, and ΔG have been evaluated using Vant Hoff plots Analysis of these values inferred that this adsorption was endothermic, spontaneous and proceeded with increased randomness.


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