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Research articles

ScienceAsia 44 (2018): 102-108 |doi: 10.2306/scienceasia1513-1874.2018.44.102

Effect of bromide concentration on the induction period of the cerium-catalysed Belousov-Zhabotinsky oscillating reaction

Kwanjira˙Panpladoa, Premkamon˙Intasria, Atchara˙Sirimungkalaa, Titikan˙Somboonb,*

ABSTRACT:     Temporal oscillations of the cerium(IV)-catalysed Belousov-Zhabotinsky reaction under addition of various Br- concentrations are investigated. The relationship between the induction period and Br- concentration, which is a controlling species in the BZ oscillating reaction, is reported. The oscillations of the Ce(IV) catalyst are followed by using UV-Vis spectrophotometric methods under closed batch and oxygen free systems. Experimental observations demonstrate that increasing Br- concentration decreases the induction period exponentially, whereas it increases the oscillation period linearly. The results reveal that the oscillations without induction period are observed by the addition of 1.0×10−2˙M Br- concentration. Addition of Br- into the BZ solution mainly involves the process A of the FKN mechanism. Numerical results reveal that the addition of Br- increases the production of BrMA, but decreases the induction period.

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a Department˙of˙Chemistry, Faculty˙of˙Science, Khon˙Kaen˙University, Nai˙Muang, Muang˙District, Khon˙Kaen˙40002˙Thailand
b Department˙of˙Chemistry, Faculty˙of˙Engineering, Rajamangala˙University˙of˙Technology˙Isan, Khonkaen˙Campus, 150˙Srijan˙Road, Nai˙Muang, Muang˙District, Khon˙Kaen˙40000˙Thailand

* Corresponding author, E-mail: oatsomboon@yahoo.com

Received 23 Aug 2017, Accepted 25 Dec 2017