Optimization of nitrate reduction by EDTA catalyzed zero-valent bimetallic nanoparticles in aqueous medium
2012
Singh, Kunwar P. | Singh, Arun K. | Gupta, Shikha
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 Fe0 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.
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