title: Kinetic, isotherm and thermodynamic studies of amaranth dye biosorption from aqueous solution onto water hyacinth leaves.
abstract: The present study explored the kinetics, equilibrium and thermodynamics of amaranth (acid red 27) anionic dye (AD) biosorption to water hyacinth leaves (LEC). The effect of LEC particle size, contact time, solution pH, initial AD concentration and temperature on AD biosorption was studied in batch experiments. AD biosorption increased with rising contact time and initial AD concentration, and with decreasing LEC particle size and solution pH. Pseudo-second-order chemical reaction kinetics provided the best correlation for the experimental data. Isotherm studies showed that the biosorption of AD onto LEC closely follows the Langmuir isotherm, with a maximum biosorption capacity of about 70 mg g(-1). The thermodynamic parameters confirm that AD biosorption by LEC is non-spontaneous and endothermic in nature. Results indicate that LEC is a strong biosorbent capable of effective detoxification of AD-laden wastewaters.
authors.affiliation: Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, México DF 11340, Mexico.
authors.forename: Imelda
authors.initials: I
authors.lastname: Guerrero-Coronilla
authors.affiliation: Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, México DF 11340, Mexico.
authors.forename: Liliana
authors.initials: L
authors.lastname: Morales-Barrera
authors.affiliation: Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, México DF 11340, Mexico. Electronic address: ecristia@encb.ipn.mx.
authors.forename: Eliseo
authors.initials: E
authors.lastname: Cristiani-Urbina
mesh_terms: D000327:Adsorption; D000548:Amaranth Dye; D001391:Azo Compounds / Q000378:metabolism*; D004396:Coloring Agents / Q000378:metabolism*; D031806:Eichhornia / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010316:Particle Size; D018515:Plant Leaves / Q000378:metabolism; D013816:Thermodynamics; D014865:Waste Disposal, Fluid
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D000548:Amaranth Dye
keywords: Amaranth dye; Biosorption; Isotherm; Kinetics; Thermodynamics; Water hyacinth leaves