Mechanistic Study and Regulatory Effects of Chloride Ions on the B-Z Oscillating Reaction

TL;DR

This paper explores how chloride ions affect the Belousov-Zhabotinsky reaction, showing that they influence the reaction's activation energy and induction time.

Contribution

The study reveals a nonmonotonic relationship between chloride ion concentration and activation energy in the B-Z reaction.

Findings

Chloride ions increase the apparent activation energy of the B-Z reaction.

The induction time increases significantly when chloride concentration rises from 1 to 2 mmol/L.

The effect of chloride ions on the B-Z system is both experimentally and theoretically confirmed.

Abstract

This work investigated the mechanistic role of chloride ions (Cl−) in the Belousov–Zhabotinsky (B-Z) oscillating reaction. We conducted a multivariate statistical analysis of the B-Z response, established a quadratic polynomial regression model, and determined the contributions of the experimental parameters to the induction time. The results indicate that the relationship between the experimental parameters and the induction time is often nonmonotonic, exhibiting secondary dependence. Then, we studied the influence mechanism by which Cl− affects the B-Z reaction system. Both experimental and theoretical studies indicate that as the concentration of Cl− increases, the system becomes more active as the activation energy increases. When the Cl− concentration is less than 1 mmol/L, the induced apparent activation energy remains relatively constant. However, as the Cl− concentration increases from 1.00 mmol/L to 2.00 mmol/L, the induced apparent activation energy increases rapidly from 50 kJ/mol to 120 kJ/mol, which severely hinders the induction period and then increases the induction time.

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