Abstract
Abstract Plastic flotation was a promising separation method for efficient recycling of waste plastics. Aiming to avoid the destruction of original surface and secondary pollution, a novel flotation process based on calcium carbonate (CaCO3) coating was proposed for separation of polyvinyl chloride (PVC) and polyethylene terephthalate (PET). The mechanism of CaCO3 coating was researched via scanning electron microscope (SEM), X–ray photoelectron spectroscopy (XPS), X–ray diffraction (XRD), zeta potential, Fourier transformed infrared spectroscopy (FT–IR), and solution chemistry analysis. High polarity of C–Cl on PVC surface resulted in selective adherence of Ca2+ on PVC surface, and Ca2+ was a bridge between plastic surface and CaCO3 particles. The separation of PVC and PET was optimized by response surface methodology (RSM) combining Box–Behnken design (BBD). Optimal pretreatment conditions for flotation separation of PVC and PET were 0.11 g CaCO3, temperature 50.6 °C, treatment time 20 min, and pH 10.1. The purity and recovery of PVC could be 100% and 99%, respectively.
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