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Heterogeneous Catalytic Peroxide Oxidation Inducing Surface Reactions Toward Flotation Extraction of Hazardous Poly(Vinyl Chloride) From Waste Plastics
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Researchers proposed using heterogeneous Fenton reactions catalyzed by green tea extract-reduced iron nanoparticles to selectively modify the wettability of poly(vinyl chloride) in mixed plastic waste streams, enabling its separation by froth flotation. They demonstrated that hydroxyl radicals generated in the iron nanoparticle and hydrogen peroxide system oxidized PVC surfaces, improving flotation separation efficiency and offering a greener approach to hazardous plastic recycling.
Low separation efficiency is a stumbling block for the recycling of heterogeneous waste plastics, which initiates the invasion of hazardous plastic pollutants, such as microplastics. The froth flotation controlled by wettability regulation strategies has become a promising remediation scheme and separation technology for plastic mixtures. Herein, this research proposed a wettability regulation for waste plastics from advanced oxidation processes (AOPs) that was heterogeneous Fenton reactions catalyzed by green tea extract-reducing iron nanoparticles (GTFe0 NPs). In the heterogeneous catalysis system (GTFe0 NPs/H2O2), the GTFe0 NP catalyst excited HO• production and the reactive HO• was a major species for plastic oxidation. Besides, surface reactions on plastics were illustrated to explain the hydrophilic pattern of acrylonitrile–butadiene–styrene (ABS), polystyrene (PS), and polycarbonate (PC). HO• radicals can attack olefinic double bonds, abstract alkane protons, and scissor carbonate groups, anchoring hydroxyl and carboxyl groups on polymer surfaces. The flotation process separated hydrophilic ABS, PS, and PC plastics from hydrophobic hazardous poly(vinyl chloride) (PVC) plastics. The recovery and purity of PVC could reach 100 and 97.6%. The mild modification temperature, wide pH value, and low oxidant concentration determined its potential application in separating hazardous plastics. Simplifying the plastic composition benefits plastic recycling and prevents environmental risks.
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