A comparative study of linear and non-linear regression analysis for ammonium exchange by clinoptilolite zeolite

Ammonium ion exchange from aqueous solution using clinoptilolite zeolite was investigated at laboratory scale. Batch experimental studies were conducted to evaluate the effect of various parameters such as pH, zeolite dosage, contact time, initial ammonium concentration and temperature. Freundlich a...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-06, Vol.144 (1), p.432-437
Main Authors: Karadag, Dogan, Koc, Yunus, Turan, Mustafa, Ozturk, Mustafa
Format: Article
Language:English
Subjects:
Adsorption
Ammonium
Applied sciences
Chemical engineering
Clinoptilolite zeolite
Exact sciences and technology
Hydrogen-Ion Concentration
Ion Exchange
Pollution
Quaternary Ammonium Compounds - chemistry
Regression Analysis
Time Factors
Waste Disposal, Fluid - methods
Water Pollutants, Chemical - chemistry
Water Purification - methods
Zeolites - chemistry
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Summary:Ammonium ion exchange from aqueous solution using clinoptilolite zeolite was investigated at laboratory scale. Batch experimental studies were conducted to evaluate the effect of various parameters such as pH, zeolite dosage, contact time, initial ammonium concentration and temperature. Freundlich and Langmuir isotherm models and pseudo-second-order model were fitted to experimental data. Linear and non-linear regression methods were compared to determine the best fitting of isotherm and kinetic model to experimental data. The rate limiting mechanism of ammonium uptake by zeolite was determined as chemical exchange. Non-linear regression has better performance for analyzing experimental data and Freundlich model was better than Langmuir to represent equilibrium data.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.10.055