Adsorption of safranin-O dye by peanut shell-based polyurethane type foam

Year 2018, Volume: 2 Issue: 2, 95 - 104, 28.12.2018

Bilal Acemioğlu , Melike Hilal Bilir Mehmet Hakkı Alma

https://doi.org/10.32571/ijct.454516

Cited By: 12

Abstract

The
adsorption of safranin-O dye was performed in batch and continuous column
sysytems by polyurethane-type
rigid foam produced from peanut shell. In batch system, effects of contact
time, initial dye concentration, solution pH and temperature on the adsorption
were investigated. In column system, solution flow rate and initial dye
concentration effect were studied. Under conditions studied, the adsorption of
safranin-O was   95-99% for batch system,
and 93-99% for column system. Adsorption isotherm best followed the Langmuir
model (R² = 0.986).
Adsorption kinetics was in consistent
with best the pseudo-second order model (R²values ≥ 0.998). Adsorption was of sponteneous nature
and in favor of increasing temperature (i.e. endothermic nature). For example,
when the temperature was increased from 20 to 60°C, standard Gibbs free energy
change (ΔG°) dereased
regularitly from -5303 to -8170 J mol^-1. The values of standard
enthalpy (ΔH°) and standard entropy
(ΔS°) were estimated as
13.35 kJ mol^-1 and 0.64 kJ mol^-1 K^-1,
respectively. Moreover, FTIR and SEM analyses were done, and the results were
interpreated in detail.

Keywords

Peanut shell, polyurethane foam, safranin-O, adsorption

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