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Synthesis and Characterize of Zeolite- Zero Valent Iron/ Silver
Nanocomposite (Z-Fe0
/Ag) for Removal Fluoride in Aqueous
Solutions (Study of Isotherms, Kinetics and Thermodynamics)
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Ali Azari   , Roshanak Rezaei Kalantary * , Amir Hossein Mahvi , Simin Naseri , Ali Esrafili , Emad Dehghanifard |
| Assistant Professor, Department of Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran |
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Abstract: (6171 Views) |
Background: Fluoride is a pollutant that entered to the environment through Glass,
Fertilizer and Semiconductor Material industries and cause problems such as
Alzheimer's and brain injuries. Adsorption with using inexpensive materials like
zeolite is the best options to remove this pollutant. The main problem of absorption
method is its low speed. So the aim of present study is investigated the effect of Fe0/Ag
nanoparticles as catalyst in performance of zeolite for removal of fluoride.
Methods: In this study were used reduction method for converting Fe2+ to Fe0 and
co-precipitation method for coating of Fe0 on Zeolite. For depositing silver on nano
zero valent iron the rapid mixing along with the high temperature were used.
Absorbent characteristics were analyzed with using SEM, TEM and XRD techniques.
Then effect of pH, contact time, stirring speed, temperature, amount of adsorbent and
Fluoride concentration were evaluated and optimized.
Results: pH=3, 60 min contact time, 200 rpm stirring speed and adsorbent concentration
equal to 10g/l were obtained as the optimum conditions for Fluoride removal. Investigating the
isotherms and kinetics relationships showed that the experimental data correlate to the
Langmuir adsorption isotherm model (R2>0.991) and pseudo-second order kinetics
(R2>0.933). The reaction thermodynamic study also expressed that process is endothermic and
non-spontaneous
Conclusion: According on the obtained results can be stated This Absorbent has
appropriate efficiency in fluoride removal, But the catalytic properties of zero valent iron and
silver was rejected in relation to removal this contaminants. |
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| Keywords: Fluoride, adsorption, zeolite, bimetallic nanocomposites, nano zero valent iron/
Silver. |
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Full-Text [PDF 508 kb]
(1909 Downloads)
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Type of Study: Research |
Subject:
General
Received: 2015/01/15 | Accepted: 2015/01/15 | Published: 2015/01/15
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