Kinetics, thermodynamics and isotherm studies of malachite
green (MG) adsorption by orange peel (OP) modified with ethanol, calcium chloride and sodium
hydroxide were
performed. Effects of initial dye concentration, temperature
and pH
on the adsorption were studied
at the different contact times. The amounts of MG adsorbed onto OP increased with increasing contact time, initial dye concentration, solution temperature, and pH. Maximum dye
adsorption was
about 92.90% under all
the experimental conditions.
Percent desorption of MG from the surface of OP was lower in the alkali and HCl
solutions and higher in an acetone-water mixture of 50%. Adsorption kinetics was best fit the pseudo-second
order model with correlation coefficients of 0.99 and 1 for the
concentrations studied. Thermodynamic results indicated a spontaneous
adsorption. Adsorption isotherm obeyed the Langmuir model. The Langmuir adsorption capacity was determined
as 14.55 mg g-1. FT-IR and SEM analyses were also recorded
before and after the adsorption.
Primary Language | English |
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Subjects | Environmental Engineering, Chemical Engineering |
Journal Section | Research Articles |
Authors | |
Publication Date | November 27, 2017 |
Published in Issue | Year 2017 Volume: 1 Issue: 1 |
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