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.
Department of Civil and Environmental Engineering, University of Ulsan, Daehakro 93, Namgu, Ulsan, 44610, Republic of Korea.
Environ Sci Pollut Res Int. 2021 May;28(19):24771-24784. doi: 10.1007/s11356-020-11796-8. Epub 2020 Nov 26.
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.
本研究报告了使用过氧化物-声化学系统选择性水合 ABS/PC 共混物表面，然后通过泡沫浮选技术从电子废料（ESR）中的其他 ABS 基塑料（ABS、ABS/PMMA）和 PS/HIPS 中选择性分离 ABS/PC。FT-IR 和 XPS 测量证实，在 ABS/PC 表面上开发亲水性部分导致其润湿性增加，然后降低其可浮性。共焦扫描结果也支持处理后的 ABS/PC 表面微尺度粗糙度的增强。增强的表面粗糙度归因于氧化过程，该过程使用商业氧化剂过氧化物和超声降解疏水性部分并在 ABS/PC 表面上促进亲水性官能团。本研究还研究了去除 ABS/PC 表面上的含 Br 化合物。选择性分离 ABS/PC 的最佳条件为：过氧化物浓度 2%、功率循环 70%、处理时间 5 分钟、温度 50°C、浮选剂浓度 0.4mg/L、浮选时间 2 分钟、空气流量 0.5L/分钟。ABS/PC 从 ESR 苯乙烯塑料中选择性分离，回收率和纯度分别高达 98.9%和 99.8%。因此，应采用开发的新型表面处理方法去除危险的 Br 化学物质，且不形成二次污染物，以提高塑料回收质量。
