Tunable Synthesis of Hematite Structures with Nanoscale Subunits for the Heterogeneous Photo-Fenton Degradation of Azo Dyes

Joshua Lai, Shouhu Xuan*, Ken Cham-Fai Leung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Facile syntheses of branched hematite (α-Fe2O3) crystals with fine-tuning of their nanoscale subunit morphologies were reported. Starting from Prussian red and bisolvent systems with controlled temperature as the crucial parameters, fine-tuning of the nanoscale subunit morphologies in the context of controlling the anisotropic growth of branched α-Fe2O3 crystals was demonstrated. The systematic and optimized studies significantly improved the controlled synthesis of the hierarchical growth of nanoscale subunits, leading to the formation of branched dendritic leaflike (secD3D, tertD2D, and tertD3D) and hyperbranched (secS2D and hypB2D) α-Fe2O3 particles for their size-reduced variants used in photocatalysis. The kinetics of the photo-Fenton degradation of three azo dyes (chlorazol black, direct blue, and methyl orange) with five types of branched dendritic α-Fe2O3 particles were compared systematically.
Original languageEnglish
Pages (from-to)13768–13778
Number of pages11
JournalACS Applied Nano Materials
Volume5
Issue number10
Early online date12 May 2022
DOIs
Publication statusPublished - 28 Oct 2022

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • azo dye
  • crystal growth
  • degradation
  • dendritic particle
  • hematite

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