Hydrothermal synthesis of cadmium selenide quantum dots: effect of reducing agent

Karimi, Behzad; Afarani, Mahdi Shafiee; Arabi, Amir Masoud

doi:10.1007/s00339-020-03903-w

Cited by 6 publications

(1 citation statement)

References 57 publications

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“…Borohydride, BH 4 − , is a strong reducing agent [ 1 , 2 , 3 ], commonly used as a reducing agent or as a source of energy as H 2 formed via solvolysis in protic solvents; Reaction (1). BH 4 − + 4ROH → 4H 2 + B(OR) 4 − …”

Section: Introductionmentioning

confidence: 99%

The Competition between 4-Nitrophenol Reduction and BH4− Hydrolysis on Metal Nanoparticle Catalysts

Varshney,

Meyerstein,

Bar-Ziv

et al. 2023

Molecules

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Assessing competitive environmental catalytic reduction processes via NaBH4 is essential, as BH4− is both an energy carrier (as H2) and a reducing agent. A comprehensive catalytic study of the competition between the borohydride hydrolysis reaction (BHR, releasing H2) and 4-nitrophenol reduction via BH4− on M0- and M/M′ (alloy)-nanoparticle catalysts is reported. The results reveal an inverse correlation between the catalytic efficiency for BH4− hydrolysis and 4-nitrophenol reduction, indicating that catalysts performing well in one process exhibit lower activity in the other. Plausible catalytic mechanisms are discussed, focusing on the impact of reaction products such as 4-aminophenol and borate on the rate and yield of BH4− hydrolysis. The investigated catalysts were Ag0, Au0, Pt0, and Ag/Pt-alloy nanoparticles synthesized without any added stabilizer. Notably, the observed rate constants for the 4-nitrophenol reduction on Ag0, Ag-Pt (9:1), and Au0 are significantly higher than the corresponding rate constants for BH4− hydrolysis, suggesting that most reductions do not proceed through surface-adsorbed hydrogen atoms, as observed for Pt0 nanoparticles. This research emphasizes the conflicting nature of BH4− hydrolysis and reduction processes, provides insights for designing improved catalysts for competitive reactions, and sheds light on the catalyst properties required for each specific process.

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