Photodegradation study of TiO2 and ZnO in suspension using miniaturized tests

Anallyne Nayara Carvalho Oliveira Cambrussi, Alan Ícaro Sousa Morais, Alex de Meireles Neris, Josy Anteveli Osajima, Edson Cavalcanti da Silva Filho, Alessandra Braga Ribeiro*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Miniaturization has been a trend in the instrumentation of chemical analyzes. The interest in miniaturization stems from the perceived benefits of faster, easier, less expensive and less wasteful analyzes than the tradition analyses. Thus, this work proposes a miniaturization of photocatalytic tests using a microplate reader for the analysis of several results, using only microliters of solution. The present work investigates the heterogeneous photocatalysis of the eosin yellow, acid yellow 73 and basic yellow 2 dyes, in the presence of zinc oxide (ZnO) and titanium dioxide (TiO2) catalysts, under irradiation in the visible light and ultraviolet light. Dye degradation was evaluated using a microplate reader (Elisa Polaris®), a photometric device that performs colorimetric readings in the 0-3 absorbance (ABS) range at wavelengths of 405, 450, 492 and 630 nm. The kinetic study was performed using the Langmuir-Hinshelwood law. It was verified that the degradation rates were higher than 90% over a period of 120 minutes for all the studied systems, especially the system composed of acid yellow dye 73 and the ZnO catalyst, which reached a degradation of 96.23% in 120 minutes.
Original languageEnglish
Article numbere-12482
JournalRevista Materia
Issue number4
Publication statusPublished - 2019
Externally publishedYes


  • Heterogeneous photocatalysis
  • Kinetic study
  • Miniaturized assays


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