Optimization of nitrate reduction by EDTA catalyzed zero-valent bimetallic nanoparticles in aqueous medium.
The present study aims to investigate the EDTA catalyzed reduction of nitrate (NO                   (3)                             (-)                 ) by zero-valent bimetallic (Fe-Ag) nanoparticles (ZVBMNPs) in aqueous medium and to enumerate the effect of temperature, solution pH, ZVBMNPs dose and EDTA concentration on NO                   (3)                             (-)                  reduction. Batch experimental data were generated using a four-factor Box-Behnken design. Optimization modeling was performed using the response surface method for maximizing the reduction of NO                   (3)                             (-)                  by ZVBMNPs. Significance of the independent variables and their interactions were tested by the analysis of variance and t test statistics. The model predicted maximum reduction capacity (340.15 mg g(-1) NO                   (3)                             (-)                 ) under the optimum conditions of temperature, 60 °C; pH 4; dose, 1.0 g l(-1); and EDTA concentration, 2.0 mmol l(-1) was very close to the experimental value (338.62 mg g(-1)) and about 16 % higher than the experimentally determined capacity (291.32 mg g(-1)). Study demonstrated that ZVBMNPs had higher reduction efficiency than Fe(0) nanoparticles for NO                   (3)                             (-)                 . EDTA significantly enhanced the NO                   (3)                             (-)                  reduction by ZVBMNPs. The EDTA catalyzed reduction of NO                   (3)                             (-)                  by ZVBMNPs can be employed for the effective decontamination of water.
Environmental Chemistry Division, CSIR-Indian Institute of Toxicology Research, Post Box 80, Mahatma Gandhi Marg, Lucknow, 226 001, India. kpsingh_52@yahoo.com
Kunwar P
KP
Singh
Arun K
AK
Singh
Shikha
S
Gupta
D004492:Edetic Acid / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods; D053768:Metal Nanoparticles / Q000737:chemistry*; D008956:Models, Chemical; D009566:Nitrates / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
D009566:Nitrates; D014874:Water Pollutants, Chemical; D004492:Edetic Acid