Manganese oxide coated TiO2 nanotube-based electrode for efficient and selective electrocatalytic sulfide oxidation to colloidal sulfur

TL;DR

This study develops a manganese oxide-coated TiO2 nanotube electrode that efficiently and selectively oxidizes sulfide to colloidal sulfur, demonstrating stability and effectiveness in complex waste streams.

Contribution

It introduces a novel MnO2/Mn2O3 coating on TiO2 nanotubes with optimized parameters, enhancing electrocatalytic sulfide oxidation performance.

Findings

Achieved selective oxidation of sulfide to colloidal sulfur (S8).

Enhanced electron transfer and adhesion due to MnxOy penetration.

Demonstrated stability and efficiency in real sewage samples.

Abstract

Manganese oxide-coated TiO2 nanotube array (NTA) was synthesized and applied for the (electro)catalytic oxidation of sulfide. By setting the electrodeposition parameters and calcination temperature, the coating obtained was MnO2 or Mn2O3, with rod or needle like morphology. Excellent catalytic activity of the Ti/TiO2 NTA/MnxOy anodes resulted in robust and selective oxidation of sulfide to elemental sulfur via an inner sphere complex between the sulfide ion and Mn-oxide. The penetration of the MnxOy inside the NTA improved adhesion and enhanced the electron transfer, thus enabling complete and rapid electrocatalytic re-oxidation of the Mn-oxide coating. At pH 8, the final product of sulfide oxidation was colloidal sulfur, S8, which prevented anode passivation and enabled a stable (electro)catalytic activity in the subsequent applications. This was observed in both synthetic electrolyte and real sewage, thus demonstrating the efficiency of the Ti/TiO2 NTA/MnxOy anode for sulfide oxidation in complex waste streams.