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- Title
Nitrate removal from aqueous solution using carbon nanotubes magnetized by nano zero-valent iron.
- Authors
Azari, Ali; Babaei, Ali-Akbar; Rezaei-Kalantary, Roshanak; Esrafili, Ali; Moazzen, Mojtaba; Kakavandi, Babak
- Abstract
Background and purpose: Nitrate is one of the most common chemical pollutants in groundwater in the world. Adsorption has been considered as an effective and efficient method of removing pollutants, particularly nitrate from aqueous solutions and so the aim of this study was to magnetization of the carbon nanotubes with zero-valent iron and using it as an adsorbent for the removal of nitrate from aquatic environments. Materials and methods: In this study, reduction method for converting divalent iron into zero-valent iron and co-precipitation method for iron particles deposition on carbon nanotubes was used. Characteristics of absorbent were analyzed by SEM (Scanning electron microscopy), XRD (X-ray powder diffraction), and VSM (Vibrating Sample Magnetometer) techniques. In this study, the effect of the pH, contact time, mixer speed, temperature, adsorbent dosage and the concentration of nitrate was investigated by one factor at the time method and then was optimized. Results: The pH equal to 3, 60 min contact time, 200 rpm stirring speed and 1 g/l absorbent was obtained as the optimum conditions in the adsorption of nitrate. Investigating the isotherm and kinetic models showed that the experimental data correlate to the Langmuir adsorption isotherm model (R²> 0.997) and pseudo-second order kinetic (R²> 0.993). The reaction thermodynamic study also expressed endothermic and spontaneous reaction. Conclusion: In optimal conditions, carbon nanotubes modified by zero-valent iron has well potential to quickly and effectively remove nitrate and simply be separated from the solution by the magnet due to its magnetic property.
- Publication
Journal of Mazandaran University of Medical Sciences (JMUMS), 2014, Vol 23, p14
- ISSN
1735-9260
- Publication type
Article