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Synthesis of zero-valent iron nanoparticles via electrical wire explosion for efficient removal of heavy metals

Seyedi, S. M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/clen.201600139
  3. Abstract:
  4. In this paper, electrical wire explosion (EWE) was used as a simple, clean, in situ method to synthesise nano zero-valent iron (nZVI) particles in liquid mediums. The structural and physical properties of the synthesised nZVI particles were characterised by x-ray diffraction, Brunauer–Emmett–Teller analysis, field emission scanning electron microscopy and transmission electron microscopy. The synthesised spherical nanoparticles, at a specific size of 10–50 nm, possessed large surface areas of approximately 13.27 m2/g, reinforcing the significant advantages of EWE, that is, less aggregation and in situ production of nanoparticles with enhanced removal efficacy, for groundwater treatment. After 1 h the adsorption capacity for Cr(VI), Ni(II), and Cd(II) (Q60 = Cions/Ciron (mg/g)) at pH 4 was approximately 143.4 (89.0%), 137.5 (79.0%), and 132.6 mg/g (72.0%), respectively. The effect of temperature was also examined at initial metal ions concentration of 70 mg/L, nZVI dosage of 0.2 g/L and pH 4. The results showed 45°C was the optimum temperature for adsorption of Cr(VI), Ni(II), and Cd(II) ions, and over a 60-min period at this temperature adsorption capacity increased to 153.56 (95.3%), 158.91 (91.3%), and 163.90 mg/g (89.0%), respectively. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  5. Keywords:
  6. Heavy metal removal ; Nanoparticles ; Adsorption ; Concentration (composition) ; Explosion ; Heavy metal ; Iron ; Nanoparticle ; Transmission electron microscopy ; Wastewater treatment
  7. Source: Clean - Soil, Air, Water ; Volume 45, Issue 3 , 2017 ; 18630650 (ISSN)
  8. URL: https://onlinelibrary.wiley.com/doi/10.1002/clen.201600139