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Optimization of nitrate reduction by EDTA catalyzed zero-valent bimetallic nanoparticles in aqueous medium

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Abstract

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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Acknowledgments

The authors thank the Director, Indian Institute of Toxicology Research, Lucknow (India) for his keen interest in this work and providing necessary facilities for this work. CSIR Senior Research Fellowship to two of us (AKS and SG) is thankfully acknowledged.

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Authors and Affiliations

  1. Environmental Chemistry Division, CSIR-Indian Institute of Toxicology Research, Post Box 80, Mahatma Gandhi Marg, Lucknow, 226 001, India

    Kunwar P. Singh, Arun K. Singh & Shikha Gupta

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  1. Kunwar P. Singh
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  2. Arun K. Singh
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  3. Shikha Gupta
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Correspondence to Kunwar P. Singh.

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Responsible editor: Hailong Wang

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Singh, K.P., Singh, A.K. & Gupta, S. Optimization of nitrate reduction by EDTA catalyzed zero-valent bimetallic nanoparticles in aqueous medium. Environ Sci Pollut Res 19, 3914–3924 (2012). https://doi.org/10.1007/s11356-012-1005-y

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