Evaluating the catalytic effects of carbon materials on the photocatalytic reduction and oxidation reactions of TiO2

Gulzar Khan, Young Kwang Kim, Sung Kyu Choi, Dong Suk Han, Ahmed Abdel-Wahab, Hyunwoong Park

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

TiO2 composites with seven different carbon materials (activated carbons, graphite, carbon fibers, singlewalled carbon nanotubes, multi-walled carbon nanotubes, graphene oxides, and reduced graphene oxides) that are virgin or treated with nitric acid are prepared through an evaporation method. The photocatalytic activities of the as-prepared samples are evaluated in terms of H2 production from aqueous methanol solution (photocatalytic reduction: PCR) and degradation of aqueous pollutants (phenol, methylene blue, and rhodamine B) (photocatalytic oxidation: PCO) under AM 1.5-light irradiation. Despite varying effects depending on the kinds of carbon materials and their surface treatment, composites typically show enhanced PCR activity with maximum 50 times higher H2 production as compared to bare TiO2. Conversely, the carbon-induced synergy effects on PCO activities are insignificant for all three substrates. Colorimetric quantification of hydroxyl radicals supports the absence of carbon effects. However, platinum deposition on the binary composites displays the enhanced effect on both PCR and PCO reactions. These differing effects of carbon materials on PCR and PCO reactions of TiO2 are discussed in terms of physicochemical properties of carbon materials, coupling states of TiO 2/carbon composites, interfacial charge transfers. Various surface characterizations of composites (UV-Vis diffuse reflectance, SEM, FTIR, surface area, electrical conductivity, and photoluminescence) are performed to gain insight on their photocatalytic redox behaviors.

Original languageEnglish
Pages (from-to)1137-1144
Number of pages8
JournalBulletin of the Korean Chemical Society
Volume34
Issue number4
DOIs
Publication statusPublished - 20 Apr 2013

Fingerprint

Carbon
Oxidation
Graphite
Composite materials
Carbon Nanotubes
rhodamine B
Oxides
Nitric Acid
Methylene Blue
Phenol
Platinum
Hydroxyl Radical
Activated carbon
Methanol
Surface treatment
Charge transfer
Photoluminescence
Evaporation
Irradiation
Degradation

Keywords

  • Artificial photosynthesis
  • Charge separation
  • Electrocatalyst
  • Solar
  • Water splitting

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Evaluating the catalytic effects of carbon materials on the photocatalytic reduction and oxidation reactions of TiO2 . / Khan, Gulzar; Kim, Young Kwang; Choi, Sung Kyu; Han, Dong Suk; Abdel-Wahab, Ahmed; Park, Hyunwoong.

In: Bulletin of the Korean Chemical Society, Vol. 34, No. 4, 20.04.2013, p. 1137-1144.

Research output: Contribution to journalArticle

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