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Putting Waste to Work: The Demonstrative Example of Pyrite Quarry Effluents Turned into Green Oxidative Catalysts

In the context of exponentially growing problems of pollution and waste, the design of ecofriendly processes for turning the current treatment of effluents into sustainable catalysts represents a great opportunity. Wastewater arising from pyrite quarrying is selected as a model example. The acidity of pyrite effluents leads to solubilization of useful cations: MnII and FeII/FeIII. Their chemical properties are an opportunity to promote innovative studies of oxidation in organic synthesis. The controlled addition of NaOH and a co-oxidant (H2O2) onto the effluents allows generation of new, oxidative catalysts. MP-AES analysis, XPS, XRPD, BET, TEM, HRTEM, and EDX studies were performed to characterize the new and efficient catalysts. Oxidation of alcohols into carbonyl compounds, oxidative cleavage of 1,2-diols, and epoxidation of alkenes are described.