Surface treatment using potassium ferrate for separation of polycarbonate and polystyrene waste plastics by froth flotation

Wang, Hui; Wang, Jianchao; Zou, Qiangpin; Liu, Weiqi; Wang, Chongqing; Huang, Wenqiu

doi:10.1016/j.apsusc.2018.04.091

Cited by 31 publications

(8 citation statements)

References 22 publications

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“…The spectra contain molecular vibrations typical for PC, at 2980 cm −1 , 2920 cm −1 and 887 cm −1 , while 828 cm −1 and 767 cm −1 can be attributed to the C-H stretching vibrations of the -CH 3 groups, and 1769 cm −1 and 1014 cm −1 are derived from molecular vibrations -C=O [ 59 , 60 , 61 ]. The peaks at 1503 cm −1 can be attributed to molecular vibrations of the aromatic ring, at 1409 cm −1 and 1364 cm −1 to deformation -OH, and 1102 cm −1 , 1160 cm −1 , 1180 cm −1 , 1187 cm −1 and 1220 cm −1 are attached to the acetyl group -C-O [ 61 , 62 ]. There are no new bands on the spectrum that could be derived from chemical bonds of the added additives, regardless of the type of filler; the spectra do not differ much, most probably due to too low amounts of fillers (maximum 3 wt.%).…”

Section: Resultsmentioning

confidence: 99%

Polymer Composites Based on Polycarbonate (PC) Applied to Additive Manufacturing Using Melted and Extruded Manufacturing (MEM) Technology

et al. 2021

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As part of the present work, polymer composites used in 3D printing technology, especially in Melted and Extruded Manufacturing (MEM) technology, were obtained. The influence of modified fillers such as alumina modified silica, quaternary ammonium bentonite, lignin/silicon dioxide hybrid filler and unmodified multiwalled carbon nanotubes on the properties of polycarbonate (PC) composites was investigated. In the first part of the work, the polymer and its composites containing 0.5–3 wt.% filler were used to obtain a filament using the proprietary technological line. The moldings for testing functional properties were obtained with the use of 3D printing and injection molding techniques. In the next part of the work, the rheological properties—mass flow rate (MFR) and mechanical properties—Rockwell hardness, Charpy impact strength and static tensile strength with Young’s modulus were examined. The structure of the obtained composites was also described and determined using scanning electron microscopy (SEM). The porosity, roughness and dimensional stability of samples obtained by 3D printing were also determined. On the other hand, the physicochemical properties were presented on the basis of the research results using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), wide angle X-ray scattering analysis (WAXS) and Fourier Transform infrared spectroscopy (FT-IR). Additionally, the electrical conductivity of the obtained composites was investigated. On the basis of the obtained results, it was found that both the amount and the type of filler significantly affected the functional properties of the composites tested in the study.

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Section: Resultsmentioning

confidence: 99%

Polymer Composites Based on Polycarbonate (PC) Applied to Additive Manufacturing Using Melted and Extruded Manufacturing (MEM) Technology

et al. 2021

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“…High flotation yields were obtained using potassium ferrate; almost 100% yield was obtained for PC and PS particles of 2-4 mm [108]. Treatment with K 2 FeO 4 changes surface properties and makes particles more floatable, due to increasing surface wettability.…”

Section: Separationmentioning

confidence: 98%

Notes on Common Misconceptions in Microplastics Removal from Water

et al. 2021

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Occurrence of microplastics in the environment has become a serious problem with too many variables and unknowns regarding their relationship not only with human health but also with other parts of the environment. The toxic and ecotoxic properties are still a subject of interest and the scientific attitude to their threat is not unified. There are numerous review papers which report on microplastic particles occurrence in water, but similarly complex reviews on methods of their removal are not that frequent. This paper aims to provide a brief overview summarizing the most tested methods of microplastics removal and intends to critically evaluate them accordingly and advert to their discrepancies.

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“…Potassium ferrate is mainly used for disinfection during sewage treatment due to its oxidation ability. , Wang used plastic flotation based on potassium ferrate modification to separate PC and PS, ABS and PS . PC and ABS became hydrophilic after potassium ferrate treatment but the hydrophobicity of PS was not affected because the benzene structure in PS hindered the reaction with the potassium ferrate solution.…”

Section: Surface Oxidationmentioning

confidence: 99%

Surface Reactions in Selective Modification: The Prerequisite for Plastic Flotation

Jiang

Zhang

Wang

2020

Environ. Sci. Technol.

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Improper disposal of waste plastic has caused much environmental pollution, but plastic recycling can reduce the amount of new and residual waste plastic in the environment through source control. Plastic flotation can separate waste plastics with similar physical and chemical properties, which suggests its promising application in plastic recycling. With the help of the different hydrophilicities waste plastic can be separated by flotation, and hydrophilization can be accomplished by surface modifications. However, no systematic studies addressing these surface reactions have been published yet, and such modifications are a prerequisite for plastic flotation. In this critical review, we not only summarize the various modification mechanisms, including physical regulation, surface oxidation, surface degradation, dechlorination, and coating, but also have reasonably added additional information for some reactions covering surface reconstruction, plastic degradation, polymer stability, wastewater treatment, soil remediation, and chemical recycling of plastic. An entirely novel concept, the “plastic gene”, is also proposed to elaborate on some contradictory results. Plastic flotation with clear surface reactions may promote plastic recycling and thereby control waste plastic at the source, save energy, and reduce microplastics. We also predict challenges for clean, efficient, and practical surface modifications and plastic flotation.

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Surface treatment using potassium ferrate for separation of polycarbonate and polystyrene waste plastics by froth flotation

Cited by 31 publications

References 22 publications

Polymer Composites Based on Polycarbonate (PC) Applied to Additive Manufacturing Using Melted and Extruded Manufacturing (MEM) Technology

Polymer Composites Based on Polycarbonate (PC) Applied to Additive Manufacturing Using Melted and Extruded Manufacturing (MEM) Technology

Notes on Common Misconceptions in Microplastics Removal from Water

Surface Reactions in Selective Modification: The Prerequisite for Plastic Flotation

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