Photocatalyst ZnO-doped Bi2O3 powder prepared by spray pyrolysis

Chin Yi Chen, Jui Chung Weng, Jing Heng Chen, Shih Hsin Ma, Kun Huang Chen, Tzyy Leng Horng, Chien Yie Tsay, Chi Jung Chang, Chung Kwei Lin, Jerry J. Wu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

In the present study, nanocrystalline photocatalyst Bi2O3 powders with various ZnO additions were synthesized by spray pyrolysis at 600 (SP600) and 700°C (SP700). The Bi2O3 powder converted from a monoclinic α phase to a tetragonal β phase at pyrolysis temperatures ≥600°C. The crystallinity of the SP powder increased with the increase in pyrolysis temperature. The morphology of the SP powders was observed to reveal a porous structure. The photocatalytic activity of the Bi2O3-based powder strongly depends on its specific surface area. Based on a constant specific surface area, 5mol% ZnO addition can significantly increase the photocatalytic efficiency of SP700 Bi2O3 powder from 46% to 86% under visible irradiation for 6h. Intrinsically, the photocatalytic performance of the SP powder is affected by the crystallite size. Furthermore, the photocatalytic activity of the resulting powders was compared with that of the P25 powder (a commercialized TiO2 powder). The mechanisms for the formations of the porous powders are also delineated.

Original languageEnglish
Pages (from-to)316-321
Number of pages6
JournalPowder Technology
Volume272
DOIs
Publication statusPublished - Mar 1 2015

Keywords

  • BiO
  • Photocatalyst
  • Spray pyrolysis
  • Surfaces area
  • ZnO

ASJC Scopus subject areas

  • Chemical Engineering(all)

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