title: Preparation of bio-based porous carbon by microwave assisted phosphoric acid activation and its use for adsorption of Cr(VI).
abstract: Ficus carica fiber based activated carbon (FCAC) was used as a potential adsorbent for Cr(VI) removal from aqueous system. The adsorbent was prepared by carbonization of F. carica fiber followed by H3PO4 activation under microwave radiations. The activated carbon was characterized using scanning electron microscopy and Fourier transformer infrared spectroscopy. The adsorption data were well studied for adsorption isotherms, kinetics models, and thermodynamics. Adsorption of chromium ion followed the second-order kinetics and best fitted the Langmuir adsorption isotherms. The maximum adsorption capacity of Cr(VI) onto FCAC was 44.84 mg/g. The calculated values of thermodynamic parameters like enthalpy change (ΔH°), entropy change (ΔS°), and free energy change (ΔG°) were found to be 7.85 kJ/mol, 69.17 J/mol K, and -13.11 kJ/mol, respectively. Adsorption process was spontaneous and endothermic in nature.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Rookree, Roorkee 247 667, India. vinodfcy@gmail.com
authors.forename: Vinod Kumar
authors.initials: VK
authors.lastname: Gupta
authors.forename: Deepak
authors.initials: D
authors.lastname: Pathania
authors.forename: Shikha
authors.initials: S
authors.lastname: Sharma
authors.forename: Pardeep
authors.initials: P
authors.lastname: Singh
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D008872:Microwaves; D010316:Particle Size; D010756:Phosphoric Acids / Q000737:chemistry*; D016062:Porosity; D013499:Surface Properties
chemical_list: D010756:Phosphoric Acids; D002857:Chromium; C074702:chromium hexavalent ion; D002244:Carbon; C030242:phosphoric acid