Multi-dimensional zinc oxide (ZnO) nanoarchitectures as efficient photocatalysts: What is the fundamental factor that determines photoactivity in ZnO?

Jang Sen Chang, Jennifer Strunk, Meng Nan Chong, Phaik Eong Poh, Joey D. Ocon

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

While bulk zinc oxide (ZnO) is of non-toxic in nature, ZnO nanoarchitectures could potentially induce the macroscopic characteristics of oxidative, lethality and toxicity in the water environment. Here we report a systematic study through state-of-the-art controllable synthesis of multi-dimensional ZnO nanoarchitectures (i.e. 0D-nanoparticle, 1D-nanorod, 2D-nanosheet, and 3D-nanoflowers), and subsequent in-depth understanding on the fundamental factor that determines their photoactivities. The photoactivities of resultant ZnO nanoarchitectures were interpreted in terms of the photodegradation of salicylic acid as well as inactivation of Bacillus subtilis and Escherichia coli under UV-A irradiation. Photodegradation results showed that 1D-ZnO nanorods demonstrated the highest salicylic acid photodegradation efficiency (99.4%) with a rate constant of 0.0364 min−1. 1D-ZnO nanorods also exhibited the highest log reductions of B. subtilis and E. coli of 3.5 and 4.2, respectively. Through physicochemical properties standardisation, an intermittent higher k value for pore diameter (0.00097 min−1 per mm), the highest k values for crystallite size (0.00171 min−1 per nm) and specific surface area (0.00339 min−1 per m2/g) contributed to the exceptional photodegradation performance of nanorods. Whereas, the average normalised log reduction against the physicochemical properties of nanorods (i.e. low crystallite size, high specific surface area and pore diameter) caused the strongest bactericidal effect.

Original languageEnglish
Article number120958
JournalJournal of Hazardous Materials
Volume381
DOIs
StatePublished - 5 Jan 2020
Externally publishedYes

Keywords

  • Photocatalytic deactivation
  • Photocatalytic degradation
  • Physicochemical properties
  • Wastewater treatment
  • ZnO nanoarchitectures

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