saujs

Sakarya University Journal of Science

2147-835X

Sakarya University

10.16984/saufenbilder.751491

Chemical Engineering

Kimya Mühendisliği

Modelling of Remazol Black-B adsorption on chemically modified waste orange peel: pH shifting effect of acidic treatment

https://orcid.org/0000-0001-9148-7253

Karaman

Ceren

AKDENIZ UNIVERSITY

https://orcid.org/0000-0002-2812-5345

Aksu

Zümriye

HACETTEPE UNIVERSITY

10 01 2020

24 5 1135 1150 06 11 2020 08 26 2020

1997

Sakarya University Journal of Science

The adsorption of Remazol Black-B (RBB) onto two different types of agricultural waste derived-adsorbents; dried-orange peel (DOP) and chemically modified orange peel (CMOP), was performed. The adsorption rate, capacity, and the dye removal efficiency were investigated in terms of initial pH ranged between 2.0 to 10.0 of the dispersion and the operating temperature of 25 °C, 35 °C, 45 °C . The Langmuir and Freundlich adsorption models were applied to the experimental data to model the adsorption equilibrium, and evaluated by regression analysis. The results indicated that the Langmuir model was more suitable to describe the adsorption equilibrium of RBB over CMOP. According to Langmuir model, while the highest RBB uptake capacity of DOP was determined as 62.4 mg.g-1 at pH 2.0 and 25°C, this value was figured out for CMOP as 84.4 mg.g-1 at pH 8.0 and 45°C. Furthermore, the adsorption kinetics followed both the pseudo-second order and the saturation type kinetic models for each adsorbent-dye system. The thermodynamic parameters of adsorption including the Gibbs free energy change (ΔGo), the enthalpy change (ΔHo), and the entropy change (ΔSo) were obtained by using thermodynamic equations. These parameters were calculated as -4.24 kJ.mol-1, 43.77 kJ.mol-1, 0.16 kJ mol-1.K-1 for CMOP respectively whereas for DOP -3.58 kJ.mol-1,-19.79 kJ.mol-1, -0.05 kJ mol-1.K-1 .

Adsorption Orange Peel Remazol Black-B Acidic Treatment Chemical Modification pH shifting Agricultural Waste

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