Colloidal metal nanocatalysts to advance orange II hydrogenolysis tracked by a microplate reader
REACTION KINETICS MECHANISMS AND CATALYSIS(2023)
Abstract
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
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Key words
Poly(1-vinyl-2-pyrrolidone),Metal nanoparticles,Orange II acid,Kinetic reaction,Langmuir-Hinshelwood
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