title: Removal of methylene blue from aqueous solution by adsorption onto pineapple leaf powder.
abstract: The ability of an unconventional bio-adsorbent, pineapple leaf powder (PLP) for the adsorption of methylene blue (MB) from aqueous solution was studied. It was observed that intra-particle diffusion was involved in the adsorption process and that the kinetic data fitted well with a pseudo-second-order equation. Fitting parameters revealed that the rate of adsorption increased with decrease in dye concentration and decrease in ionic strength while the mixing speed did not have a significant effect on adsorption. The adsorption was favorable at higher pH and lower temperature, and the equilibrium data were well fitted by the Langmuir isotherm. The maximum adsorption capacity varied from 4.68 x 10(-4) to 9.28 x 10(-4)mol/g when pH increases from 3.5 to 9.5. Thermodynamic parameters suggest that the adsorption is a typical physical process, spontaneous, and exothermic in nature. The results revealed that this agricultural waste has potential to be used as an economical adsorbent for the removal of methylene blue from aqueous solution.
authors.affiliation: Department of Civil and Ecological Engineering, I-Shou University, Da-Hsu Township, Kaohsiung 84008, Taiwan. chweng@isu.edu.tw
authors.forename: Chih-Huang
authors.initials: CH
authors.lastname: Weng
authors.forename: Yao-Tung
authors.initials: YT
authors.lastname: Lin
authors.forename: Tai-Wei
authors.initials: TW
authors.lastname: Tzeng
mesh_terms: D000327:Adsorption; D031230:Ananas; D007220:Industrial Waste / Q000517:prevention & control*; D007700:Kinetics; D008751:Methylene Blue / Q000302:isolation & purification*; D018515:Plant Leaves; D011208:Powders; D012996:Solutions; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D007220:Industrial Waste; D011208:Powders; D012996:Solutions; D014874:Water Pollutants, Chemical; D008751:Methylene Blue