title: Adsorption of direct dye on palm ash: kinetic and equilibrium modeling.
abstract: Palm ash, an agriculture waste residue from palm-oil industry in Malaysia, was investigated as a replacement for the current expensive methods of removing direct blue 71 dye from an aqueous solution. The experimental data were analyzed by the Langmuir and Freundlich models of adsorption. Equilibrium data fitted well with Freundlich model in the range of 50-600mg/L. The equilibrium adsorption capacity of the palm ash was determined with the Langmuir equation and found to be 400.01mg dye per gram adsorbent at 30 degrees C. The rates of adsorption were found to conform to the pseudo-second-order kinetics with good correlation. The results indicate that the palm ash could be employed as a low-cost alternative to commercial activated carbon.
authors.affiliation: School of Chemical Engineering, Engineering Campus, University Science Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
authors.forename: A A
authors.initials: AA
authors.lastname: Ahmad
authors.forename: B H
authors.initials: BH
authors.lastname: Hameed
authors.forename: N
authors.initials: N
authors.lastname: Aziz
mesh_terms: D000327:Adsorption; D028023:Arecaceae / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D007220:Industrial Waste; D007700:Kinetics; D008956:Models, Chemical; D000073878:Palm Oil; D010938:Plant Oils; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods; D014873:Water Pollutants / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D007220:Industrial Waste; D010938:Plant Oils; D014873:Water Pollutants; D000073878:Palm Oil; C408744:Direct Blue 71