Self-rotating photocatalytic system for aqueous Cr(VI) reduction on TiO2 nanotube/Ti mesh substrate

Youngji Kim, Hyunku Joo, Namguk Her, Yeomin Yoon, Chang-Ha Lee, Jaekyung Yoon

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

In this study, a self-rotating photocatalytic system is applied to reduce toxic Cr(VI) to non-toxic Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powdery photocatalysis, a novel approach towards a photocatalytic system for aqueous Cr(VI) reduction including self-rotating TiO2 nanotubes on a Ti substrate (mesh type) was established.For the preparation of TiO2 nanotubes on the Ti substrate, Ti mesh (10cm×10cm) was anodized at 50V to 25°C for 25min with mixed electrolytes (NH4F-H2O-C2H6O2), and then annealed at 450°C for 2h in ambient oxygen at a flow rate of 400mLmin-1. The fabricated TiO2 nanotube arrays were uniformly grown on Ti mesh and surface characterizations was performed through the measurements of SEM, XRD, and zeta potential.The HRT (Hydraulic retention time) and rotating speeds were significantly affected by inlet flowrate in this reactor being decreased and increased, respectively, with increasing inlet flowrate. Hence, the efficiency of photocatalytic Cr(VI) reduction was observed to be highest up to 95% at the 90rpm. In addition, the rate of Cr(VI) reduction was increased by increasing the number of TiO2/Ti meshes.

Original languageEnglish
Pages (from-to)66-71
Number of pages6
JournalChemical Engineering Journal
Volume229
DOIs
Publication statusPublished - 2013 Aug 1

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Nanotubes
substrate
Substrates
Photocatalysis
Zeta potential
electrolyte
Poisons
irradiation
aqueous solution
scanning electron microscopy
X-ray diffraction
Electrolytes
Flow rate
Hydraulics
Irradiation
hydraulics
oxygen
Scanning electron microscopy
Oxygen
chromium hexavalent ion

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry

Cite this

Kim, Youngji ; Joo, Hyunku ; Her, Namguk ; Yoon, Yeomin ; Lee, Chang-Ha ; Yoon, Jaekyung. / Self-rotating photocatalytic system for aqueous Cr(VI) reduction on TiO2 nanotube/Ti mesh substrate. In: Chemical Engineering Journal. 2013 ; Vol. 229. pp. 66-71.
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abstract = "In this study, a self-rotating photocatalytic system is applied to reduce toxic Cr(VI) to non-toxic Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powdery photocatalysis, a novel approach towards a photocatalytic system for aqueous Cr(VI) reduction including self-rotating TiO2 nanotubes on a Ti substrate (mesh type) was established.For the preparation of TiO2 nanotubes on the Ti substrate, Ti mesh (10cm×10cm) was anodized at 50V to 25°C for 25min with mixed electrolytes (NH4F-H2O-C2H6O2), and then annealed at 450°C for 2h in ambient oxygen at a flow rate of 400mLmin-1. The fabricated TiO2 nanotube arrays were uniformly grown on Ti mesh and surface characterizations was performed through the measurements of SEM, XRD, and zeta potential.The HRT (Hydraulic retention time) and rotating speeds were significantly affected by inlet flowrate in this reactor being decreased and increased, respectively, with increasing inlet flowrate. Hence, the efficiency of photocatalytic Cr(VI) reduction was observed to be highest up to 95{\%} at the 90rpm. In addition, the rate of Cr(VI) reduction was increased by increasing the number of TiO2/Ti meshes.",
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Self-rotating photocatalytic system for aqueous Cr(VI) reduction on TiO2 nanotube/Ti mesh substrate. / Kim, Youngji; Joo, Hyunku; Her, Namguk; Yoon, Yeomin; Lee, Chang-Ha; Yoon, Jaekyung.

In: Chemical Engineering Journal, Vol. 229, 01.08.2013, p. 66-71.

Research output: Contribution to journalArticle

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