Author/Authors :
Mosaferi، Mohammad نويسنده National Public Health Management Center (NPMC), Department of Environmental Health Engineering, Tabriz University of Medical Sciences , , Nemati، Sepideh نويسنده Department of Environmental Health Engineering, Tabriz University of Medical Sciences, Tabriz, Iran , , Khataee، Alireza نويسنده Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran , , Nasseri، Simin نويسنده 1Department of Environmental Health Engineering, School of Public Health and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran , , Asl Hashemi، Ahmad نويسنده 1Department of Environmental Health Engineering, Tabriz University of Medical Sciences, Tabriz, Iran ,
Abstract :
In this work, synthetic nanoscale zerovalent iron (NZVI) stabilized with two polymers, Starch and Carboxymethyl
cellulose (CMC) were examined and compared for their ability in removing As (III) and As (V) from aqueous
solutions as the most promising iron nanoparticles form for arsenic removal.
Batch operations were conducted with different process parameters such as contact time, nanoparticles
concentration, initial arsenic concentration and pH.
Results revealed that starch stabilized particles (S-nZVI) presented an outstanding ability to remove both arsenate
and arsenite and displayed ~ 36.5% greater removal for As (V) and 30% for As (III) in comparison with CMC-stabilized
nanoparticles (C-nZVI). However, from the particle stabilization viewpoint, there is a clear trade off to choosing the best
stabilized nanoparticles form. Removal efficiency was enhanced with increasing the contact time and iron loading but
reduced with increasing initial As (III, V) concentrations and pH. Almost complete removal of arsenic (up to 500 ?g/L)
was achieved in just 5 min when the S-nZVI mass concentration was 0.3 g/L and initial solution pH of 7 ± 0.1. The
maximum removal efficiency of both arsenic species was obtained at pH = 5 ± 0.1 and starched nanoparticles was
effective in slightly acidic and natural pH values. The adsorption kinetics fitted well with pseudo-second-order
model and the adsorption data obeyed the Langmuir equation with a maximum adsorption capacity of 14 mg/g
for arsenic (V), and 12.2 mg/g for arsenic (III).
It could be concluded that starch stabilized Fe0 nanoparticles showed remarkable potential for As (III, V) removal
from aqueous solution e.g. contaminated water.
