title: Adsorption of Reactive Red M-2BE dye from water solutions by multi-walled carbon nanotubes and activated carbon.
abstract: Multi-walled carbon nanotubes and powdered activated carbon were used as adsorbents for the successful removal of Reactive Red M-2BE textile dye from aqueous solutions. The adsorbents were characterised by infrared spectroscopy, N(2) adsorption/desorption isotherms and scanning electron microscopy. The effects of pH, shaking time and temperature on adsorption capacity were studied. In the acidic pH region (pH 2.0), the adsorption of the dye was favourable using both adsorbents. The contact time to obtain equilibrium at 298K was fixed at 1h for both adsorbents. The activation energy of the adsorption process was evaluated from 298 to 323K for both adsorbents. The Avrami fractional-order kinetic model provided the best fit to the experimental data compared with pseudo-first-order or pseudo-second-order kinetic adsorption models. For Reactive Red M-2BE dye, the equilibrium data were best fitted to the Liu isotherm model. Simulated dyehouse effluents were used to check the applicability of the proposed adsorbents for effluent treatment.
authors: Department of Material, Federal University of Rio Grande do Sul, Av Osvaldo Aranha 99, Laboratory 705C, ZIP 90035-190, Porto Alegre, RS, Brazil.
authors: Fernando M
authors: FM
authors: Machado
authors: Carlos P
authors: CP
authors: Bergmann
authors: Thais H M
authors: TH
authors: Fernandes
authors: Eder C
authors: EC
authors: Lima
authors: Betina
authors: B
authors: Royer
authors: Tatiana
authors: T
authors: Calvete
authors: Solange B
authors: SB
authors: Fagan
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis; D007700:Kinetics; D008855:Microscopy, Electron, Scanning / Q000379:methods; D015233:Models, Statistical; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013784:Textiles; D013816:Thermodynamics; D014227:Triazines / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D037742:Nanotubes, Carbon; D009282:Naphthalenesulfonates; D014227:Triazines; D014874:Water Pollutants, Chemical; D014867:Water; C003213:Procion Brilliant Red M-2BS; C569406:Reactive Red M-2BE; D002244:Carbon