SORPTION OF MELANOIDIN ONTO SURFACTANT MODIFIED ZEOLITE

Journal article

Authors / Editors

Ochieng, Aoyi

Research Areas

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Publication Details

Author list: Onyango MS, Kittinya J, Hadebe N, Ojijo VO, Ochieng A

Publisher: Association of the Chemical Engineers of Serbia

Place: BELGRADE

Publication year: 2011

Journal acronym: CHEM IND CHEM ENG Q

Volume number: 17

Issue number: 4

Start page: 385

End page: 395

Number of pages: 11

ISSN: 1451-9372

Languages: English-Great Britain (EN-GB)

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Abstract

Melanoidin is responsible for the dark brown color of distillery wastewater. Discharge of colored 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 suifactant 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 are 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.

Keywords

equilibrium, Kinetics, melanoidin, Sorption, surfactant modified zeolite

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