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This work evaluates the kinetics of thallium jarosite decomposition in alkaline media to investigate its potential for thallium retention.

February 5, 2026ChemEngineeringOpen Access

Kinetics of Decomposition in Alkaline Media NaOH and Ca(OH)2 of Thallium Jarosite

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Evaluating thallium jarosite decomposition kinetics in alkaline media, indicating efficient thallium retention alternatives.

This work evaluates the kinetics of thallium jarosite decomposition in alkaline media to investigate its potential for thallium retention.
Assessed effects of NaOH and Ca(OH)2 concentrations from 0.03 M to 5.5 × 10−4 M
Conducted experiments at temperatures ranging from 20 °C to 60 °C
Monitored reactions using Inductively Coupled Plasma (ICP) and X-ray diffraction (XRD) analysis
Analyzed kinetic models, specifically the chemically controlled shrinking core model
Induction period observed with no release of ions or byproducts
Progressive conversion period showed the release of sulfur and thallium ions into solution
Activation energies for NaOH medium: 101.52 kJ mol−1 (induction) and 91.87 kJ mol−1 (progressive conversion)
Activation energies for Ca(OH)2 medium: 79.45 kJ mol−1 (induction) and 71.14 kJ mol−1 (progressive conversion)
Kinetics indicate high influence of chemical reactions in both media for decomposition process

Islas et al. (2026) studied this question.

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