Anodic TiO2 nanotube layer directly formed on the inner surface of Ti pipe for a tubular photocatalytic reactor

Hyoung Il Kim, Doohun Kim, Wooyul Kim, Yoon Cheol Ha, Seong Ju Sim, Sujeong Kim, Wonyong Choi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We demonstrated the successful water treatment performance of a continuous-flow tubular TiO2 nanotube reactor made of Ti pipe where a TiO2 nanotube (TNT) layer was directly formed on the inner wall by an electrochemical anodization process. A cylindrical UV lamp was inserted into the pipe to irradiate the inner TNT surface as a light source. To optimize the thickness of TNT layer on Ti pipe, TNT layers with 1, 5 and 10 μm thickness were prepared and their photocatalytic activities were tested for the degradation of various organic substrates (acid orange 7 (AO7), dichloroacetate (DCA), and 4-chlorophenol (4-CP)) under UV illumination. The TNT layer with 10 μm thickness showed the highest photocatalytic activity, with first-order removal rate constants (k:min-1) of 0.019, 0.039, and 0.025 for AO7, 4-CP, and DCA, respectively. The directly formed TNTs (10 μm thickness) on Ti pipes in the continuous-flow tubular TNT reactor, having a strong adhesiveness and a high surface area, enabled the successful degradation of organic compounds and to have kept the activity without decrease during the repeated cycles and long-term experiments. The photocatalytic performance of the tubular TNT reactor was tested with a higher concentration, smaller volume ([4-CP]0 = 100 μM, solution vol. = 15 mL) and a lower concentration, larger volume ([4-CP]0 = 20 μM, solution vol. = 100 mL) in the circulation-flow mode (20 mL min-1). A good performance was achieved under the low intensity UV illumination (≈2 mW cm-2) with a half-life of ca. 50 min and ca. 11 h with 80% and 79% removal of TOC for the above two test conditions, respectively. The proposed tubular TNT reactor can be an effective option in the design of continuous flow-type photocatalytic reactors for practical water purification.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalApplied Catalysis A: General
Volume521
DOIs
Publication statusPublished - 2016 Jul 5

Fingerprint

Nanotubes
Pipe
Lighting
Trinitrotoluene
Ultraviolet lamps
Degradation
Acids
Water treatment
Organic compounds
Purification
Light sources
Rate constants
4-chlorophenol
Water
Substrates

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

Kim, Hyoung Il ; Kim, Doohun ; Kim, Wooyul ; Ha, Yoon Cheol ; Sim, Seong Ju ; Kim, Sujeong ; Choi, Wonyong. / Anodic TiO2 nanotube layer directly formed on the inner surface of Ti pipe for a tubular photocatalytic reactor. In: Applied Catalysis A: General. 2016 ; Vol. 521. pp. 174-181.
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abstract = "We demonstrated the successful water treatment performance of a continuous-flow tubular TiO2 nanotube reactor made of Ti pipe where a TiO2 nanotube (TNT) layer was directly formed on the inner wall by an electrochemical anodization process. A cylindrical UV lamp was inserted into the pipe to irradiate the inner TNT surface as a light source. To optimize the thickness of TNT layer on Ti pipe, TNT layers with 1, 5 and 10 μm thickness were prepared and their photocatalytic activities were tested for the degradation of various organic substrates (acid orange 7 (AO7), dichloroacetate (DCA), and 4-chlorophenol (4-CP)) under UV illumination. The TNT layer with 10 μm thickness showed the highest photocatalytic activity, with first-order removal rate constants (k:min-1) of 0.019, 0.039, and 0.025 for AO7, 4-CP, and DCA, respectively. The directly formed TNTs (10 μm thickness) on Ti pipes in the continuous-flow tubular TNT reactor, having a strong adhesiveness and a high surface area, enabled the successful degradation of organic compounds and to have kept the activity without decrease during the repeated cycles and long-term experiments. The photocatalytic performance of the tubular TNT reactor was tested with a higher concentration, smaller volume ([4-CP]0 = 100 μM, solution vol. = 15 mL) and a lower concentration, larger volume ([4-CP]0 = 20 μM, solution vol. = 100 mL) in the circulation-flow mode (20 mL min-1). A good performance was achieved under the low intensity UV illumination (≈2 mW cm-2) with a half-life of ca. 50 min and ca. 11 h with 80{\%} and 79{\%} removal of TOC for the above two test conditions, respectively. The proposed tubular TNT reactor can be an effective option in the design of continuous flow-type photocatalytic reactors for practical water purification.",
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Anodic TiO2 nanotube layer directly formed on the inner surface of Ti pipe for a tubular photocatalytic reactor. / Kim, Hyoung Il; Kim, Doohun; Kim, Wooyul; Ha, Yoon Cheol; Sim, Seong Ju; Kim, Sujeong; Choi, Wonyong.

In: Applied Catalysis A: General, Vol. 521, 05.07.2016, p. 174-181.

Research output: Contribution to journalArticle

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