title: Kinetics and equilibrium studies of malachite green adsorption on rice straw-derived char.
abstract: In this work, the potential feasibility of rice straw-derived char (RSC) for removal of C.I. Basic Green 4 (malachite green (MG)), a cationic dye from aqueous solution was investigated. The isotherm parameters were estimated by non-linear regression analysis. The equilibrium process was described well by the Langmuir isotherm model. The maximum RSC sorption capacity was found to be 148.74 mg/L at 30 degrees C. The kinetics of MG sorption on RSC followed the Lagergren's pseudo-first-order model and the overall rate of dye uptake was found to be controlled by external mass transfer at the beginning of adsorption, while intraparticle diffusion controlled the overall rate of adsorption at a later stage. The results indicated that RSC was an attractive adsorbent for removing basic dye from aqueous solutions.
authors.affiliation: School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia. chbassim@eng.usm.my
authors.forename: B H
authors.initials: BH
authors.lastname: Hameed
authors.forename: M I
authors.initials: MI
authors.lastname: El-Khaiary
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry*; D005525:Food-Processing Industry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012275:Oryza; D012394:Rosaniline Dyes / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014866:Waste Products; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D012394:Rosaniline Dyes; D014866:Waste Products; D014874:Water Pollutants, Chemical; C005095:malachite green