Abstract
A sample of potassium arsenojarosite was synthesized and thoroughly characterized. The obtained sample is a solid solution of potassium arsenojarosite, whose approximate formula is [K0.75(H3O)0.25 ]Fe1.84[(SO4)1.82(AsO 4)0.18][(OH)2.34(H 2O)3.66]. The decomposition process in alkaline medium was studied in the induction and progressive conversion periods, and the reaction order and activation energy were determined for each case. Under the used experimental conditions, results are consistent with the spherical particle model with decreasing core and chemical control. In both processes, four partial models and two global models were developed in order to describe their basic behavior. The models were validated, and it was proved that they favorably describe the decomposition process in alkaline medium.
Highlights
Kinetic Modeling of the Alkaline Decomposition of Potassium ArsenojarositeUma amostra de arsenojarosita de potássio foi sintetizada e completamente caracterizada
In many parts of the world, potable water is polluted with arsenic
Partial and global kinetic models of the induction and progressive conversion periods were developed for the alkaline decomposition of the potassium arsenojarosite in NaOH and Ca(OH)[2] media
Summary
Uma amostra de arsenojarosita de potássio foi sintetizada e completamente caracterizada. A amostra obtida é uma solução sólida de arsenojarosita de potássio, cuja fórmula aproximada é [K0,75(H3O)0,25]Fe1,84[(SO4)1,82(AsO4)0,18][(OH)2,34(H2O)3,66]. O processo de decomposição em meio alcalino foi estudado no período de indução e de conversão progressiva, e a ordem de reação e a energia de ativação foram determinadas para cada caso. Os modelos foram validados, e foi provado que descrevem favoravelmente o processo de decomposição em meio alcalino. Under the used experimental conditions, results are consistent with the spherical particle model with decreasing core and chemical control. In both processes, four partial models and two global models were developed in order to describe their basic behavior.
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