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


KARADAĞ D. , Koç Y., Turan M., Öztürk M.

JOURNAL OF HAZARDOUS MATERIALS, cilt.144, ss.432-437, 2007 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 144
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.jhazmat.2006.10.055
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Sayfa Sayıları: ss.432-437

Özet

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. (C) 2006 Elsevier B.V. All rights reserved.