title: Biochars prepared from anaerobic digestion residue, palm bark, and eucalyptus for adsorption of cationic methylene blue dye: characterization, equilibrium, and kinetic studies.
abstract: Biochars prepared from anaerobic digestion residue (BC-R), palm bark (BC-PB) and eucalyptus (BC-E) were used as sorbents for removal of cationic methylene blue dye (MB). The FE-SEM images indicated that the biochars have a well-developed pore structure, and the Brunauer-Emmett-Teller surface areas of BC-R, BC-PB, and BC-E were 7.60, 2.46, and 10.35 m(2)g(-1), respectively. The efficiencies of MB removal in the samples with initial concentrations of 5 mg L(-1) at pH 7.0 and 40°C by BC-R, BC-PB, and BC-E after 2h were 99.5%, 99.3%, and 86.1%, respectively. Pseudo-second-order kinetics was the most suitable model for describing the adsorption of MB onto the biochars. The experimental data were best described by the Langmuir isotherm model, with a maximum monolayer adsorption capacity of 9.50 mg g(-1) at 40°C for BC-R. The biochars produced from the three types of solid waste showed considerable potential for adsorption.
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.forename: Shungang
authors.initials: S
authors.lastname: Wan
authors.forename: Wensui
authors.initials: W
authors.lastname: Luo
mesh_terms: D000327:Adsorption; D000693:Anaerobiosis; D028023:Arecaceae / Q000737:chemistry*; D002412:Cations; D002606:Charcoal / Q000737:chemistry*; D004396:Coloring Agents / Q000302:isolation & purification*; D005052:Eucalyptus / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000302:isolation & purification*; D008956:Models, Chemical; D024301:Plant Bark / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D002412:Cations; D004396:Coloring Agents; D012996:Solutions; C540010:biochar; D002606:Charcoal; D008751:Methylene Blue