Open AccessHigh nitrate removal by starch‐stabilized Fe 0 nanoparticles in aqueous solution in a controlled system
Author(s) -
Rajab Beigy Mahdieh,
Rasekh Behnam,
Yazdian Fatemeh,
Aminzadeh Behnoush,
Shekarriz Marzieh
Publication year - 2018
Publication title -
engineering in life sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.547
H-Index - 57
eISSN - 1618-2863
pISSN - 1618-0240
DOI - 10.1002/elsc.201700127
Subject(s) - aqueous solution , zerovalent iron , nitrate , chemistry , nuclear chemistry , nanoparticle , starch , reactivity (psychology) , stabilizer (aeronautics) , transmission electron microscopy , denitrification , fourier transform infrared spectroscopy , chemical engineering , inorganic chemistry , materials science , nitrogen , nanotechnology , organic chemistry , medicine , mechanical engineering , alternative medicine , adsorption , pathology , engineering
This study was conducted to investigate biodenitrification efficiency with starch‐stabilized nano zero valent iron (S‐nZVI) as the additional electron donor in the presence of S 2 O 3 in aqueous solutions, under anaerobic conditions. The main challenge for nZVI application is their tendency to agglomeration, thereby resulting in loss of reactivity that necessitates the use of stabilizers to improve their stability. In this study, S‐nZVI was synthesized by chemical reduction method with starch as a stabilizer. The synthesized nanoparticles were characterized by TEM, XRD, and FTIR. Transmission electron microscopy (TEM) image shows S‐nZVI has a size in the range of 5–27.5 nanometer. Temperature and S‐nZVI concentration were the important factors affecting nitrate removal. Biodenitrification increased at 35°C and 500 mg/L of S‐nZVI, in these conditions, biodenitrification efficiency increased from 40.45 to 78.84%. Experimental results suggested that biodenitrification increased by decreasing initial nitrate concentration. In the bioreactor biodenitrification rate was 94.07% in the presence of S‐nZVI. This study indicated that, Fe 2+ could be used as the only electron donor or as the additional electron donor in the presence of S 2 O 3 to increase denitrification efficiency.