Colloidal metal nanocatalysts to advance orange II hydrogenolysis tracked by a microplate reader

Oluwatayo Racheal Onisuru, Ali K. Ilunga, Kariska Potgieter, Charles O. Oseghale, Reinout Meijboom

Research output: Contribution to journalArticlepeer-review


The thermal reduction method was applied to synthesize metal nanoparticles using poly(1-vinyl-2-pyrrolidone) as an organic stabilizer to control metal nanoparticle agglomeration. Colloidal metal nanoparticles, gold, palladium, and gold–palladium nanoparticles were synthesized, and UV–visible spectrophotometry and high-resolution transmission electron microscopy analyses were conducted to characterize them. The metal nanoparticle micrographs showed well-dispersed particles with an average size of 9.6 nm (Au), 15.4 nm (Pd), and 10.6 nm (AuPd). All the colloidal metal nanoparticles served as nanocatalysts to advance a reductive degradation of orange II in presence of borohydride ions. For a prompt screening of catalytic activity, the microplate reader system was considered at a fixed maximum absorbance wavelength of λ 489 nm respected by orange II. Excess borohydride ions were used to construct pseudo-first kinetic conditions. The Langmuir–Hinshelwood model allowed the finding of kinetic activity on the surface of metal nanoparticles. AuPd nanocatalyst interface exhibited low activation energy (5.38 kJ mol−1) compared to the one on Au (8.19 kJ mol−1) and Pd (7.23 kJ mol−1). Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1005-1019
Number of pages15
JournalReaction Kinetics, Mechanisms and Catalysis
Issue number2
Publication statusPublished - Apr 2023


  • Kinetic reaction
  • Langmuir–Hinshelwood
  • Metal nanoparticles
  • Orange II acid
  • Poly(1-vinyl-2-pyrrolidone)

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Colloidal metal nanocatalysts to advance orange II hydrogenolysis tracked by a microplate reader'. Together they form a unique fingerprint.

Cite this