期刊
JOURNAL OF CLEANER PRODUCTION
卷 318, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.128569
关键词
Clean plasma; Free radicals; Plastic flotation; Plastic recycling; Surface modification
资金
- Natural Science Basic Research Pro-gram of Shaanxi [2019JQ-899]
- National Natural Science Foundation of China [41672224]
- Research Foundation of Baoji University of Arts and Sciences [ZK2018043, 209040071]
The study proposed a combined flotation process with prepositive plasma modification to separate hazardous PVC from recyclable HDPE and PET, achieving high recovery and purity of separated PVC through selective surface wetting facilitated by low molecular weight oxidic substances introduced by plasma activation.
Flotation has a great potential in the separation of complicated poly-mixtures to obtain qualified resins for recycling, but it remains a technological challenge for selective wetting between components. This study provided a combined flotation process with the prepositive plasma modification, separating hazardous polyvinyl chloride (PVC) from recyclable high-density polyethylene (HDPE) and polyethylene terephthalate (PET). The plasma process was characterized by surface morphology, molecular weight, contact angle, surface free energy and spectrum. The results suggested that amorphous low molecular weight oxidic substances can be selectively introduced on these polymers through the hydrogen extraction and Norrish CYRILLIC CAPITAL LETTER BYELORUSSIAN-UKRAINIAN I type radical pathways in plasma zone, leading to a desired surface wetting. Under the optimal unit activating energy of 12.0 kJ/m(2) (PVC-HDPE) and 15.0 kJ/m(2) (PVC-PET), separated PVC can reach above 93% of both recovery and purity. Benefiting from the green and mild operation in plasma unit, this study paves a new way to effectively separate waste plastics as an alternative to traditional surface modification with chemical reagents.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据