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Open Access Nano Express

Sulfur Nanoparticles Synthesis and Characterization from H2S Gas, Using Novel Biodegradable Iron Chelates in W/O Microemulsion

Aniruddha S Deshpande1, Ramdas B Khomane1, Bhalchandra K Vaidya1, Renuka M Joshi1, Arti S Harle2 and Bhaskar D Kulkarni1*

Author affiliations

1 Chemical Engineering & Process Development Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India

2 Center for Material Characterization Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India

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Citation and License

Nanoscale Research Letters 2008, 3:221-229  doi:10.1007/s11671-008-9140-6

Published: 3 July 2008

Abstract

Sulfur nanoparticles were synthesized from hazardous H2S gas using novel biodegradable iron chelates in w/o microemulsion system. Fe3+–malic acid chelate (0.05 M aqueous solution) was studied in w/o microemulsion containing cyclohexane, Triton X-100 andn-hexanol as oil phase, surfactant, co-surfactant, respectively, for catalytic oxidation of H2S gas at ambient conditions of temperature, pressure, and neutral pH. The structural features of sulfur nanoparticles have been characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive spectroscopy (EDS), diffused reflectance infra-red Fourier transform technique, and BET surface area measurements. XRD analysis indicates the presence of α-sulfur. TEM analysis shows that the morphology of sulfur nanoparticles synthesized in w/o microemulsion system is nearly uniform in size (average particle size 10 nm) and narrow particle size distribution (in range of 5–15 nm) as compared to that in aqueous surfactant systems. The EDS analysis indicated high purity of sulfur (>99%). Moreover, sulfur nanoparticles synthesized in w/o microemulsion system exhibit higher antimicrobial activity (against bacteria, yeast, and fungi) than that of colloidal sulfur.

Keywords:
Sulfur nanoparticles; H2S gas; Iron chelates; W/O microemulsion; Antimicrobial activity