Kinetic and Isotherm Adsorption Non- Linear Models Survey for Nitrate by Titanium Dioxide Nano Particles

Document Type : review paper

Authors

1 Natural Resources Engineering, Environmental Engineering Graduate- Faculty of Agricultural Sciences and Natural Resources, Iran.

2 PhD Student of Irrigation and Drainage, Agriculture Faculty of Ferdowsi University, Iran.

3 PhD Student of Irrigation and Drainage, Water Engineering Faculty of Chamran University, Ahwaz, Iran

4 PhD Student of Irrigation and Drainage, Agriculture Faculty of Ferdowsi University, Iran

5 Research Assistant Professor, Date Research Institue, Iran

Abstract

Nitrate removal from contaminated water is one of the important environmental issues. In this study nitrate adsorption by titanium dioxide nanoparticles was surveyed and in order to determine the effective factors in absorption, discontinuous system was used. The results showed that the maximum capacity of titanium dioxide nanoparticles in nitrate adsorption occurred at pH=5 and contact time 120 minutes. Equilibrium models (Langmuir and Freundlich) and non-equilibrium (Ho et al and Lagergren) were used to investigate the adsorption process. Comparing the determination coefficients between measured data and obtained value from Ho’s model (R2= 0.98) and Lagergren model (R2= 0.95) showed that the Ho’s model describes experimental data better. Also, comparing the Langmuir and Freundlich isotherm for nitrate adsorption by titanium dioxide nanoparticles showed that Freundlich isotherm (R2= 0.99) was more proper than Langmuir isotherm (R2= 0.91) in describing adsorption process.

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History

  • Receive Date: 27 April 2014
  • Accept Date: 27 April 2014

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