Uptake of Silver by Jarosite and Natrojarosite Family Compounds at 22 °C, 97 °C and 140 °C

The jarosite family of minerals are part the alunite supergroup with general formula AB3(TO4)2(OH)6. Jarosite known to incorporate silver (Ag), but extent which this occurs, and at what temperature range, is not well constrained. To address knowledge gap, compounds A site filled K, Na, Ag H3O were synthesised 22 °C, 97 °C 140 simulate low-, moderate- high-temperature environments, respectively. characterised by XRD, SEM, chemical analysis Raman spectroscopy. All took up Ag. In general, higher temperatures synthesis increased alkali occupancy products. Silver contents increasing concentration in starting solutions all temperatures. order preference for solids K > Na temperatures, consistent reported ΔGf −3309 kJ/mol, −3270 −3247 kJ/mol −2948 jarosite, natrojarosite, hydroniumjarosite argentojarosite, results study show that can be incorporated natrojarosite low-to-high therefore, important stores natural engineered environments.