Adsorption of Arsenic from Aqueous Solutions by Iron Filings and the Effect of Magnetic Field

Document Type : Original Article

Authors

1 Environmental Health Engineering Department, Health Faculty, Kashan University of Medical Sciences, Kashan, Iran

2 Biostatistics & Public Health Department, Health Faculty, Kashan University of Medical Sciences, Kashan, Iran

3 Environmental Health Engineering Department, Health Faculty, Tehran University of Medical Sciences, Tehran, Iran

Abstract

Aims Arsenic contamination of natural water resources has become an important
environmental problem in the world. The adsorption method by iron filings adsorbent or
zero-valent iron was used. The study aimed to evaluate the efficiency of iron filings in arsenite
removal from polluted water and to investigate the effect of magnetic field on the process.
Materials & Methods This interventional study was conducted in synthetically polluted
water samples with certain arsenic concentrations. With regard to the initial arsenic
concentration (0.5 and 2mg/l), iron filings dosages (0, 2.5 and 5g/l), contact times (5, 10 and
15min) and considering the samples before and after magnetic column, 108 samples were
prepared. Data was analyzed by paired sample T and one-way ANOVA tests.
Findings The highest mean of removal efficiency at the initial arsenic concentration of
0.5mg/l was seen at the iron filings of 5g/l and 10min contact time (87.7±10.0) and at the
initial arsenic concentration of 2mg/l was seen at the iron filings of 5g/l and 15min contact
time (86.3±8.4). At the initial arsenic concentration of 0.5mg/l, magnetic field increased the
removal efficiency of arsenite at the iron filings dosage of 0g/l and decreased it at the iron
filings dosage of 5g/l. The same happened at the initial arsenic concentration of 2mg/l.
Conclusion Arsenic is reduced from the water samples with the iron filings dosage of 5g/l at
natural pH. Magnetic field increases the arsenic removal efficiency in the absence of the iron
filings and decreases the arsenic removal efficiency in the presence of the iron filings.

Keywords