Sono-oxidation treatment of hazardous ABS/PC surface for its selective separation from ESR styrene plastics
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WASTE AND BIOMASS MANAGEMENT & VALORIZATION
Sono-oxidation treatment of hazardous ABS/PC surface for its selective separation from ESR styrene plastics Nguyen Thi Thanh Truc 1 & Hung Anh Le 1 & Byeong-Kyu Lee 2 Received: 16 April 2020 / Accepted: 23 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This study reports the selective hydrophilization of the ABS/PC blend surface using the peroxide-sonochemical system and then its selective separation by froth flotation technique from other ABS-based plastics (ABS, ABS/PMMA) and PS/HIPS in electronic shredder residue (ESR). FT-IR and XPS measurements confirm that the hydrophilic moiety development on the ABS/PC surface led to increasing the wettability of ABS/PC and then decreased its floatability. The confocal scanning results also support the enhancement of microscale roughness of the treated ABS/PC surface. The enhanced surface roughness is attributed to the oxidative process which degrades hydrophobic moieties and promotes hydrophilic functional groups on the ABS/PC surface using commercial oxidant peroxide and ultrasound. This study also investigated removal of Br-containing compounds on the ABS/PC surface. The optimum conditions for selectively ABS/PC separation are peroxide concentration 2%, power cycle 70%, treatment time 5 min, temperature 50 °C, floating agent concentration 0.4 mg/L, flotation time 2 min, and airflow rate 0.5 L/min. ABS/PC was selectively separated from ESR styrene plastics with high recovery and purity of 98.9% and 99.8%, respectively. Hence, the developed novel surface treatments having removal of hazardous Br chemicals and none-formation of secondary pollutants should be applied for upgrading plastic recycling quality. Keywords Selective separation . Sonochemical treatment . Styrene plastics . Recycling
Introduction The rapidly growing volume and increasing environmental issues of waste electrical and electronic equipment (WEEE) are becoming more difficult for managers and technicians (Jang 2010; Taurino et al. 2010; Jang et al. 2014; Wäger and Hischier 2015). The WEEE recycling process involves dismantling, shredding, and crushing. Therefore, a singular crushing process to deal with WEEE will produce electronic-waste shredder residue (ESR) containing plastic-rich fractions, although it is considered a low value product or even waste Responsible Editor: VÃtor Pais Vilar * Byeong-Kyu Lee [email protected] 1
Institute for the Environmental Science, Engineering and Management, Industrial University of Ho Chi Minh City, No.12, Nguyen Van Bao Street, Ward 4, Go Vap District, Ho Chi Minh City 70000, Vietnam
2
Department of Civil and Environmental Engineering, University of Ulsan, Daehakro 93, Namgu, Ulsan 44610, Republic of Korea
(Arends et al. 2015). However, the plastic fraction in ESR has usually not been taken seriously due to the focus on metal recovery rather than recovering plastic for recycling purpose. WEEE contains about 10–30% plastics (Taurino et al. 2010; Martinho et al. 2012), most of which a
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