Open AccessSorption of melanoidin onto surfactant modified zeolite
Author(s) -
Maurice S. Onyango,
Jacob O. Kittinya,
Nomcebo Hadebe,
Vincent Ojijo,
Aoyi Ochieng
Publication year - 2011
Publication title -
chemical industry and chemical engineering quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.189
H-Index - 26
eISSN - 2217-7434
pISSN - 1451-9372
DOI - 10.2298/ciceq110125025o
Subject(s) - sorption , melanoidin , chemistry , adsorption , endothermic process , zeolite , desorption , aqueous solution , freundlich equation , kinetics , langmuir , langmuir adsorption model , chromatography , distilled water , chemical engineering , inorganic chemistry , organic chemistry , physics , quantum mechanics , maillard reaction , engineering , catalysis
Melanoidin is responsible for the dark brown colour of distillery wastewater. Discharge of coloured wastewater has a major environmental impact on the biota of the receiving water body. Consequently, this study explores the removal of melanodin from aqueous solution. The equilibrium, kinetics and thermodynamics of melanoidin sorption are studied by varying initial solution pH, initial concentration, adsorbent dose and temperature. Kinetically, the melanoidin removal from solution by a surfactant modified zeolite is rapid and the amount adsorbed is dependent on pH, initial concentration, adsorbent dose and temperature. The equilibrium sorption data are fitted to the Freundlich and Langmuir models while the sorption, kinetics is described by the Ho pseudo-second order and Elovich models. The thermodynamic analysis indicates that the sorption is spontaneous and endothermic in nature. The FTIR spectra analyses show no new peaks or shift in peaks after sorption indicating that the melanoidin sorption may have occurred by a physical process. The results from desorption studies showed that melanoidin eluted back easily to the solution using distilled water which corroborates the physical sorption mechanism