Journal
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
Volume 23, Issue 1, Pages 96-106Publisher
SPRINGER
DOI: 10.1007/s10163-020-01099-y
Keywords
Waste plastics recycling; Surface treatment; Microwave; Wetting agent; Plastic flotation
Categories
Funding
- Natural Science Foundation of Shaanxi Province [2020JM-236]
- Fund Project of Shaanxi Key Laboratory of Land Consolidation [2018-ZD04]
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A novel surface treatment method combining microwave treatment with a wetting agent was proposed to selectively separate ABS from WEEE plastics, achieving a high recovery rate and purity. The optimal conditions and the mechanism of the surface treatment were investigated, providing technological insights for the separation and recovery of waste ABS from WEEE plastics.
Acrylonitrile butadiene styrene (ABS), as a main component of plastics of waste electrical and electronic equipment (WEEE), shows high potential for recycling, which is restricted by the absence of an efficient separation method. Herein, a novel surface treatment method, microwave treatment combined with a wetting agent, was proposed to selectively change the hydrophilicity of the mixed waste plastics, which efficiently separated ABS from the WEEE plastics by flotation. The results of this approach provided the following optimal conditions, i.e., microwave power 700 W, microwave irradiation time 3 min, concentration of wetting agent carboxymethylcellulose sodium (CMC) 25 mg/L, treatment time with CMC 5 min, stirring rate 1800 rpm, frother concentration 40 mg/L, and flotation time 4 min. Under these optimal conditions, the recovery and the purity of ABS reached 97.70% and 99.86%, respectively. The mechanism of the surface treatment was examined by means of contact angle, Fourier transform infrared spectroscopy (FT-IR), and adsorption kinetics. The results showed that the selective wetting mechanism can be attributed to the physisorption of CMC on the surface of plastics. In conclusion, this surface treatment method is expected to provide technological insights for the separation and recovery of waste ABS from WEEE plastics.
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