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DOI: https://doi.org/10.4491/eer.2019.277
Development of Bi-Langmuir model for description initial pH and temperature effects on the sorption of cadmium onto waste foundry sand
Noora Saad1, Ziad T. Abd Ali2, Laith A. Naji3, Ayad A.A.H. Faisal4, and Nadhir Al-Ansari5
1Department of Civil Engineering, Al-Nahrain University, Baghdad, Iraq
2Department of Environmental Engineering, College of Engineering, University of Baghdad, Iraq
3Department of Environmental Engineering, College of Engineering, University of Baghdad, Iraq
4Department of Environmental Engineering, College of Engineering, University of Baghdad, Iraq
5Department of Civil, Environmental and Natural Resources Engineering, Lulea University of Technology, 97187 Lulea, Sweden
Corresponding Author: Ayad A.A.H. Faisal ,Tel: +964 7904208688, Email: ayadabedalhamzafaisal@yahoo.com
Received: June 28, 2019;  Accepted: September 2, 2019.
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ABSTRACT
The present study develops the sorption model for simulating the effects of pH and temperature on the uptake of cadmium from contaminated water using waste foundry sand (WFS) by allowing the variation of the maximum adsorption capacity and affinity constant. The presence of two acidic functional groups with the same or different affinity is the basis in the derivation of the two models; Model 1 and Model 2 respectively. The developed Bi-Langmuir model with different affinity (Model 2) has a remarkable ability in the description of process under consideration with coefficient of determination > 0.9838 and sum of squared error < 0.08514. This result is proved by FTIR test where the weak acids responsible of cadmium ions removal using WFS sorbent can be represented by surface silanol (O-H) functional groups.
Keywords: Cadmium | Foundry sand | Modified langmuir model | Simulation | Sorption
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