Abstract
In this paper we report the shape-directing role of cationic cetyltrimethylammonium bromide (CTAB) surfactant on the morphology silver nanoparticles (AgNPs). UV-visible data reveal that the position of surface plasmon resonance band strongly depends on the [glycine] as well as [CTAB]. The reaction follows pseudo first order kinetics with respect to [glycine]. The position and intensity of absorption band could be tuned by changing [MB]. The presence of CTAB was essential for the synthesis of stable prefect transparent yellow colour silver cols at room temperature. The as prepared AgNPs was used as a catalyst for the decolourizarion of methyl orange. Catalytic efficiency increases with [NaBH4] from 0.0% to fold 90%. The activation energy was found to be 119 kJ mol(-1) for the degradation of methyl orange, where as we did not observed the degradation of dye with only [NaBH4]. A most plausible mechanism is proposed with the following rate law to the degradation of methyl orange.
-d[Methyl orange]/dt = k K-c K-a K-ad [H+] [BH4-] [Methyl orange](T) [Ag-0]/(K-a+[H+]) (C) 2017 Elsevier B.V. All rights reserved.