Removal of Arsenic (III) and Chromium (VI) from Aqueous Solutions Using Nanoscale Zero Valent Iron (nZVI) Particles and Determining Adsorption Isotherms
Abstract:
Background
Arsenic and Chromium are heavy metals that are conventional pollutants of water and wastewater sources. Nanoscale Zero Valent Iron (nZVI) can remove these pollutants based on their high potency. The aim of present study was to removal of Arsenic (III) and Chromium (VI) from aqueous solutions using nZVI and determining adsorption isotherms.
Methods
The design expert software was used to determining and affecting different such as pH, initial concentration, nZVI dosage and contact time on Arsenic and Chromium removal. Final concentration of metals was measured using Inductivity Coupled Plasma (ICP). Finally, the best fitted adsorption isotherms were determined.
Findings: Results showed that Arsenic optimum removal was happened in initial concentration 10 mg/l, time 5 min, pH=7 and nZVI dosage 5 g/l. Arsenic removal followed up Langmuir isotherms in different concentrations with nZVI. The Arsenic response was occurred, rapidly, with nZVI high concentration in neutral environment. The Arsenic removal efficiency was inverse respect with concentration increase. The Chromium removal efficiency with nZVI was low.
Conclusion
Results showed that nZVI had high efficiency for Arsenic removal in aqueous solutions. Therefore, it could be used for removal of this metal from polluted water and industrial wastewater. Nevertheless, Chromium removal efficiency was low with nZVI.
Language:
Persian
Published:
Journal of Health System Research, Volume:13 Issue: 1, 2017
Pages:
126 to 133
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