title: Iron impregnated activated carbon as an efficient adsorbent for the removal of methylene blue: regeneration and kinetics studies.
abstract: In this study, iron impregnated activated carbon (FeAC) was synthesized following an oxidation and iron impregnation of activated carbon (AC). Both the AC and FeAC were characterized by pHZPC and FTIR spectroscopy. The removal of Methylene Blue (MB) by AC and FeAC was examined under various experimental conditions. The FeAC showed up to 95% (higher than AC) MB removal in the pH range of 7-10. Although the reaction kinetics was pseudo-second order, the overall rate was controlled by a number of processes such as film diffusion, pore diffusion and intraparticle diffusion. The activation energy values for the MB uptake by AC and FeAC (21.79 and 14.82 kJ/mol, respectively) revealed a physisorption process. In the regeneration study, FeAC has shown consistently ≥ 90% MB removal even up to 10 repeated cycles. The reusable characteristic of the spent FeAC improved the practical use of activated carbon and can be a breakthrough for continuous flow system applications where it can work effectively without any significant reduction in its performance.
authors: School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors: Irfan
authors: I
authors: Shah
authors: School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors: Rohana
authors: R
authors: Adnan
authors: School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors: Wan Saime
authors: WS
authors: Wan Ngah
authors: School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
authors: Norita
authors: N
authors: Mohamed
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry / Q000302:isolation & purification*; D009994:Osmolar Concentration; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D014874:Water Pollutants, Chemical; D002606:Charcoal; D007501:Iron; D008751:Methylene Blue