Surface treatment with peroxymonosulfate for flotation separation of waste polyvinylchloride and acrylonitrile-butadiene-styrene: Optimization and mechanism
Surface treatment with peroxymonosulfate for flotation separation of waste polyvinylchloride and acrylonitrile-butadiene-styrene: Optimization and mechanism
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过一硫酸盐表面处理废旧聚氯乙烯与丙烯腈-丁二烯-苯乙烯浮选分离：优化及机理
DOI：
10.1016/j.jclepro.2020.124158
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发表时间：
2020-12
影响因子：
11.1
通讯作者：
Hui Wang
中科院分区：
文献类型：
--
作者：
Maozhi Luo;Hongru Jiang;Yingshuang Zhang;Hui Wang
聚氯乙烯（PVC）和丙烯腈-丁二烯-苯乙烯（ABS）作为废塑料中的常见成分，由于其相似的物理和化学性质，难以分离，这限制了塑料的回收利用和清洁生产。本研究建立了一种利用过氧单硫酸根（PMS）改性废PVC和ABS表面的新方法，并在浮选过程中成功实现了分离。通过单参数实验确定了与PMS氧化能力密切相关的关键变量pH、温度和浓度。随后，采用Box-Behnken设计（BBD）响应面法（RSM）对上述表面处理条件进行优化。建立了预测PVC纯度（响应值）的二次元模型。采用扫描电镜（SEM）、傅里叶变换红外光谱（FT-IR）、x射线光电子能谱（XPS）等方法对表面改性机理进行了探讨。结果表明，最佳条件为PMS浓度为0.026 mol/L， pH值为9.0，温度为65℃。在三次验证试验中，PVC的纯度可达99.72%，回收率为100.00%，ABS的纯度可达100.00%，回收率为99.81%。此外，浮选与PMS联合处理在分离废PVC和ABS方面的应用潜力显著。表面处理机理表明，在ABS表面引入含氧基团，增强了ABS的亲水性，而PVC在浮选过程中几乎不受影响，保持悬浮状态。本研究建立了一种基于RSM优化的新型表面改性方法，为废PVC和ABS浮选分离提供了可靠的机理。
Polyvinylchloride (PVC) and acrylonitrile-butadiene-styrene (ABS), as common components in waste plastic, are hard to separate due to similar physical and chemical properties, which limits plastic recycling and cleaner production. In this research, a novel approach by using peroxymonosulfate (PMS) was established to modify waste PVC and ABS surface, and separation was successfully realized in flotation process. Key variables closely related to PMS oxidation capacity, namely pH, temperature, and concentration were confirmed through single parameter experiments. Subsequently, response surface methodology (RSM) using Box-Behnken design (BBD) was applied to optimize the above surface treatment conditions. A quadratic model was generated for predicting PVC purity (response value). Mechanism of surface modification was explored by Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS). Results showed that the optimal conditions were PMS concentration of 0.026 mol/L, pH value of 9.0, and temperature of 65 °C, respectively. PVC can achieve 99.72% purity and 100.00% recovery, and ABS can reach 100.00% purity and 99.81% recovery in triplicate validation tests, respectively. Additionally, available ranges of particle sizes, mass ratios, and reuse of reagents further show the remarkable application potential of flotation combined with PMS treatment in separating waste PVC and ABS. The mechanism of surface treatment shows that oxygen-containing groups are introduced into ABS surface, enhancing the hydrophilicity of ABS, but PVC is almost unaffected and remains floating in flotation process. This study established a novel surface modification with RSM optimization and reliable mechanisms for the flotation separation of waste PVC and ABS.
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