Green Process for Industrial Waste Transformation into Super-Oxidizing Materials Named Alkali Metal Ferrates (VI)

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ID: 110267
2019
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Abstract
The investigation presented here features the design of a cleaner and greener chemical process for the conversion of industrial wastes into super-oxidizing materials. The waste of interest is the iron sulfate heptahydrate (FeSO4·7H2O) mainly generated through the sulfate route used for titanium dioxide industrial production. The products of this transformation process are alkali ferrates (A2FeO4, A = Na, K) containing iron in its hexavalent state and considered as powerful oxidants characterized by properties useful for cleaning waters, wastewaters, and industrial effluents. The proposed process includes two steps: (i) The first step consisting of the pre-mixing of two solids (AOH with FeSO4·xH2O) in a rotary reactor allowing the coating of iron sulfate in the alkali hydroxides through solid–solid reactions; and (ii) the second step involves the synthesis of alkali ferrates in a fluidized bed by oxidation of the single solid obtained in the first step in diluted chlorine. The chemical synthesis of alkali ferrates can be carried out within a timeframe of a few minutes. The usage of a fluidized bed enhanced the energy and mass transfer allowing a quasi-complete control of the ferrate synthesis process. The alkali ferrate synthesis process described here possesses many characteristics aligned with the principles of the “green chemistry”.
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Authors Ndue Kanari;Etleva Ostrosi;Cécile Diliberto;Inna Filippova;Seit Shallari;Eric Allain;Frederic Diot;Fabrice Patisson;Jacques Yvon;Kanari, Ndue;Ostrosi, Etleva;Diliberto, Cécile;Filippova, Inna;Shallari, Seit;Allain, Eric;Diot, Frederic;Patisson, Fabrice;Yvon, Jacques;
Journal Materials (Basel, Switzerland)
Year 2019
DOI
10.3390/ma12121977
URL
https://www.mdpi.com/1996-1944/12/12/1977
Keywords
fluidized bed industrial waste green process alkali ferrates super-oxidizing materials fluidized bed industrial waste green process alkali ferrates super-oxidizing materials National Center for Biotechnology Information NCBI NLM MEDLINE pubmed abstract nih national institutes of health national library of medicine pmid:31248153 pmc6630659 doi:10.3390/ma12121977 ndue kanari etleva ostrosi jacques yvon

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