Kinetics of 4‑nitrophenol reduction with NaBH4 over Ag/CuO nanomaterial catalyst

Nguyen Le My Linh; Dang Thi Thanh Nhan

doi:10.62239/jca.2023.079

Authors

Nguyen Le My Linh Hue University College of Education Author
Dang Thi Thanh Nhan Hue University College of Education Author

DOI:

https://doi.org/10.62239/jca.2023.079

Keywords:

Ag/CuO, 4-nitrophenol, nanomaterial

Abstract

In this paper, Ag/CuO nanomaterials were prepared via hydrothermal method combined with chemical reduction and used as catalysts in the reduction of 4-nitrophenol. Kinetic study of 4-nitrophenol (4-NP) reduction into 4-aminophenol (4-AP) by sodium borohydride revealed a first order reaction. The reaction rate constant k increased with amount of silver crystals introduced into CuO nanosheets, with Ag/CuO catalyst concentrations and with temperature. The thermodynamic activation parameters such as activation energy (E_a), enthalpy of activation (∆H^#), entropy (∆S^#) and Gibbs energy (∆G^#) of activation were determined. The value of E_a, ∆H^#, ∆S^#and ∆G^#were 72,33 kJ/mol, –69,86 kJ/mol, –24,28 J/K.mol and –62,50 kJ/mol (303K), respectivement. Ethanol and isopropanol were able to inhibit the 4-NP reduction with NaBH₄ in the presence of Ag/CuO catalyst.

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