Reaction kinetics of molybdenum dissolution by hydrogen peroxide in acidic and alkaline solutions using tartaric acid and sodium hydroxide: A semi‐empirical model with rotating disc method

Abstract

Abstract Molybdenum is an amphoteric metal that dissolves in both acidic and alkaline solutions. This fundamental study explores a sustainable process for the dissolution of molybdenum, focusing on the reaction kinetics in H 2 O 2 , H 2 O 2 ‐NaOH, and H 2 O 2 ‐C 4 H 6 O 6 solutions. A rotating disc method was applied with the Levich's equation. Semi‐empirical models with activation energy were developed for the H 2 O 2 ‐NaOH and H 2 O 2 ‐C 4 H 6 O 6 solutions. The study examined the effects of rotating speed, disc surface area, temperature, H 2 O 2 , NaOH, and C 4 H 6 O 6 concentrations, along with rotating speed, disc surface area, and temperature. Hydrogen peroxide significantly impacted molybdenum dissolution rates across all three solutions. The reaction order of hydrogen peroxide concentration in the H 2 O 2 solution was greater than that of the H 2 O 2 ‐NaOH and H 2 O 2 ‐C 4 H 6 O 6 solutions. The complex of molybdenum peroxo was formed in H 2 O 2 and H 2 O 2 ‐NaOH solutions but decomposed at a temperature ≥50°C. The activation energies were determined to be 49.90, 43.60, and 41.10 kJ/mol for the H 2 O 2 , H 2 O 2 ‐NaOH, and H 2 O 2 ‐C 4 H 6 O 6 solutions.