Formation of Aligned Iron Oxide Nanopores as Cr Adsorbent Material

Abstract:

Elongated iron oxide nanopores (FNPs) were fabricated by anodisation of iron in fluoride-ethylene glycol (EG) added to it 1 ml, 1 M KOH electrolyte at three different voltages: 30 V, 40 V and 50 V. It was observed regardless of the voltage applied; the nanopores seem to be separated from one to another at the bottom part of the anodic film forming rather discreet nanotubular structure at this region. X-ray diffraction (XRD) was used to evaluate the phases present within the anodic layer. γ-FeOOH, Fe (OH)₂, and FeF₅.H₂O were detected in all samples. However, when the anodisation voltage was increased, peaks from the FeF₅.H₂O are more intense indicating either more F^- insertion in the anodic layer or crystallization of this phase at higher voltage. After annealing, XRD detected only hematite; α-Fe₂O₃ and magnetite; Fe₃O₄ indicative of phase formation or transformation had occurred during the annealing process. The annealed samples displayed an ability to adsorb Cr (VI) with almost 30 % reduction of the Cr (VI) concentration after 5 hours of exposure to the nanoporous anodic film.

• Periodical: Advanced Materials Research (Volume 1087)
• Pages: 460-464
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1087.460
• Online since: February 2015
• Authors: Monna Rozana, Khairunisak Abdul Razak, G. Kawamura, Atsunori Matsuda, Zainovia Lockman*
• Keywords: Adsorbent, Anodisation, Iron Oxide, Nanoporous

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