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Homogeneous Palladium Nanoparticles Surface Hosts Catalyzed Reduction of the Chromophoric Azo (–N=N–) Group of Dye, Acid Orange 7 by Borohydride in Alkaline Media
Author(s) -
Das Ranendu Sekhar,
Singh Bula,
Mandal Arabinda,
Banerjee Rupendranath,
Mukhopadhyay Subrata
Publication year - 2014
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20883
Subject(s) - chemistry , sodium borohydride , sulfanilic acid , catalysis , borohydride , palladium , adsorption , reaction rate , activation energy , nuclear chemistry , photochemistry , inorganic chemistry , organic chemistry
In alkaline media, well‐characterized gelatin‐stabilized palladium (GPd) nanoparticles catalyze the reduction of the azo group containing pollutant dye, Acid Orange 7 (AO7) by sodium borohydride (NaBH 4 ) to 1‐amino‐2‐napthol and sulfanilic acid. Kinetic observations and detailed FTIR studies suggests that the reaction follows Langmuir–Hinshelwood kinetic model, where during the reaction both AO7 and borohydride are adsorbed on the GPd surface. Plots of ln k o versus ln[AO7] or ln[NaBH 4 ] show that the order of reaction with respect to AO7 and NaBH 4 remains almost same over different molar ratios of [NaBH 4 ]/[AO7]. The catalyzed reaction shows an initial induction period ( t 0 ) due to a surface‐restructuring process of GPd nanoparticles, and (1/ t 0 ) can be defined as the rate of surface restructuring. The activation energy of the catalyzed reaction and energy of the surface‐restructuring process of GPd are estimated as 22 ± 3 and 25 ± 7 kJ M −1 , respectively.