Improvement of zero valent iron nanoparticles by ultrasound-assisted synthesis, study of Cr(VI) removal and application for the treatment of metal surface processing wastewater

Abstract

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Fenton like oxidative degradation of toxic water pollutants by iron nanoparticles synthesized via facile green route using waste iron rust as the iron precursor

“…Previously several methods have been used for the synthesis of iron nanoparticles like chemical reduction by sodium borohydride (NaBH 4 ) under mechanical stirring or ultrasonication in an inert atmosphere [39], Laser fragmentation of iron plates into ligand-free iron nanoparticles in different liquids [40], chemical co-precipitation of Fe 2+ and Fe 3+ solutions in a definite ratio for magnetite preparation [41] as Lakhanpal et al [42] did in their study to coat magnetite nanoparticle over sand particles. The organic green synthesis method of iron nanoparticle synthesis generally use water as a solvent and it is free of toxic chemicals, requiring less time, energy, and cost for synthesis [43].…”

Synergistic Removal of Cr(VI) with Stable Nanozerovalent Iron Particles and Ultrasound Assistance in the Presence of Organic Additives

“…31 Another paper studied the Cr(VI) removal with a nZVI material prepared using US (20 kHz) during the synthesis; these nanoparticles had a higher specific surface area compared with the ones prepared in the absence of US and have been found very effective for Cr(VI) removal. 37 In the present paper, the application of NSTAR for Cr(VI) reduction with US assistance in the presence of EDTA or Cit as additives under air bubbling has been studied. NSTAR powder is a different material from those previously tested in combination with US.…”

Green sulfidated iron oxide nanocomposites for efficient removal of Malachite Green and Rhodamine B from aqueous solution

“…Nanomaterials as adsorbents, have attracted considerable attraction because of their larger specific surface areas, welldefined shapes, and manageable size. Iron nanoparticles (including zero-valent iron and iron oxide nanoparticles) have been extensively applied in environmental remediation with their distinctive physical and chemical characteristics, great specific surface areas, high reaction activity and abundant raw material sources (Handojo et al 2020;Bounab et al 2021;Golabiazar et al 2021). However, due to its slow removal rate of some pollutants, narrow range of active pH value (Bounab et al 2021), easy agglomeration and other problems, researchers focus more on iron nanoparticles modification to overcome its shortcomings.…”

“…Iron nanoparticles (including zero-valent iron and iron oxide nanoparticles) have been extensively applied in environmental remediation with their distinctive physical and chemical characteristics, great specific surface areas, high reaction activity and abundant raw material sources (Handojo et al 2020;Bounab et al 2021;Golabiazar et al 2021). However, due to its slow removal rate of some pollutants, narrow range of active pH value (Bounab et al 2021), easy agglomeration and other problems, researchers focus more on iron nanoparticles modification to overcome its shortcomings. At present, the main modification measures include green synthetic iron nanoparticles, sulfide-modified iron nanoparticles, supported iron nanoparticles, and stabilized-modified iron nanoparticles (Zhang et al 2018(Zhang et al , 2020Liang et al 2021).…”