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.

丙烯腈-丁二烯-苯乙烯（ABS）作为废弃电子电气设备（WEEE）的塑料的主要成分，具有很高的回收潜力，但由于缺乏有效的分离方法而受到限制。在本文中，提出了一种新颖的表面处理方法，即与润湿剂结合的微波处理，以选择性地改变混合废塑料的亲水性，从而通过浮选有效地将ABS从WEEE塑料中分离出来。该方法的结果提供了以下最佳条件，即微波功率700 W，微波辐照时间3分钟，润湿剂羧甲基纤维素钠（CMC）的浓度25 mg / L，CMC处理时间5分钟，搅拌速度1800 rpm，起泡浓度为40 mg / L，浮选时间为4分钟。在这些最佳条件下，ABS的回收率和纯度分别达到97.70％和99.86％。通过接触角，傅立叶变换红外光谱（FT-IR）和吸附动力学研究了表面处理的机理。结果表明，选择性润湿机理可归因于CMC在塑料表面的物理吸附。总之，这种表面处理方法有望为从WEEE塑料中分离和回收废ABS提供技术见解。