Aqueous sulfide oxidation catalyzed by hydrocarbon solution of 3,3′,5,5′-tetra-tert-butyl-stilbenequinone: a kinetics and mechanistic approach

Abstract

In this study, the kinetics and mechanism of the reaction of sulfide oxidation catalyzed by hydrocarbon solution of 3,3′, 5,5′-tetra-tert-butyl-stilbenequinone have been deeply investigated. The reaction is of the first order with respect to each of the reagents. The molecular mechanism of catalysis was discussed, in which elemental sulfur was produced at intermediate stages during transformation of sulfide to sulfate. The algebraic equations describing the transition of catalytic reaction from the diffusion region to the kinetic region were established. The formation of strong reactive oxygen species during the catalyst generation not only plays an extremely important role in the oxidation reaction catalyzed by stilbenequinone, but also paves the way for the development of an advanced catalyst system based on the Fenton reaction. A preliminary survey of advanced catalyst system activity based stilbenequinone/Fe (II)/O₂ has been conducted for oxidative degradation of sulfide.

GRAPHICAL ABSTRACT

KEYWORDS:

• Aqueous sulfide oxidation
• catalytic oxidation
• mechanistic approach
• reaction kinetics
• Fenton-like reaction

Disclosure statement

No potential conflict of interest was reported by the author(s).