Cost-effective large-scale synthesis of oxygen-defective ZnO photocatalyst with superior activities under UV and visible light

Jing Wang, Ruosong Chen, Yi Xia, Guifang Wang, Hongyuan Zhao, Lan Xiang, Sridhar Komarneni

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A cost-effective solution method was developed to produce ZnO photocatalyst in large quantity, through the conversion of ε-Zn(OH) 2 to ZnO in NaOH solutions. Experimental results indicated that the concentrated NaOH solution (4 mol L −1 ) promoted the rapid formation of ZnO owing to the enhanced dissolution-precipitation reactions. The large-scale synthesis was also achieved with high-yield and solvent-recyclability. Structural analysis based on X-ray photoelectron spectroscopy, electron spin resonance and photoluminescence revealed that the as-prepared ZnO photocatalyst was rich in oxygen vacancies (V O ). The V O -rich ZnO photocatalyst exhibited improved visible-light absorption, higher photocurrent responses and superior activities toward the degradation of rhodamine B under both UV (λ~254 nm) and visible-light illumination (λ>420 nm) compared to commercial ZnO and P25 TiO 2 powders, as well as good cycle stability. Based on the results of photoluminescence and active species detection, the V O -enhanced photocatalytic activity was attributed to the generation of V O -isolated level in the band structure. Under UV light, the V O -level could promote charge separation by trapping the photoinduced electrons, while under visible-light, the V O -level improved visible-light absorption and facilitated the charge generation. The presently developed synthesis may potentially benefit the large-scale production and low-cost application of ZnO photocatalyst for solar energy utilization.

Original languageEnglish (US)
Pages (from-to)1870-1879
Number of pages10
JournalCeramics International
Volume43
Issue number2
DOIs
StatePublished - Feb 1 2017

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Photocatalysts
Oxygen
rhodamine B
Light absorption
Costs
Photoluminescence
Oxygen vacancies
Photocurrents
Structural analysis
Ultraviolet radiation
Band structure
Powders
Solar energy
Paramagnetic resonance
Dissolution
Energy utilization
X ray photoelectron spectroscopy
Lighting
Degradation
Electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Wang, Jing ; Chen, Ruosong ; Xia, Yi ; Wang, Guifang ; Zhao, Hongyuan ; Xiang, Lan ; Komarneni, Sridhar. / Cost-effective large-scale synthesis of oxygen-defective ZnO photocatalyst with superior activities under UV and visible light. In: Ceramics International. 2017 ; Vol. 43, No. 2. pp. 1870-1879.
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Cost-effective large-scale synthesis of oxygen-defective ZnO photocatalyst with superior activities under UV and visible light. / Wang, Jing; Chen, Ruosong; Xia, Yi; Wang, Guifang; Zhao, Hongyuan; Xiang, Lan; Komarneni, Sridhar.

In: Ceramics International, Vol. 43, No. 2, 01.02.2017, p. 1870-1879.

Research output: Contribution to journalArticle

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AU - Chen, Ruosong

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