Green disposal of waste smartphone protective film: Efficiency, mechanism, bench-scale test and secondary waste reutilization

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Jiangyao Chen , Shunyu Ding , Chenxu Gao , Canhui Chen , Taicheng An
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Abstract

The manufacture and obsolescence of smartphones produce numerous waste plastic accessories (e.g., waste smartphone protective film (WSPF)), possessing immense potential for recycling. However, available recycling technologies have limitations such as substrate damage and secondary pollutant generation. The present study aimed to develop a green disposal method that not only recycled polyethylene terephthalate (PET) from WSPF, but also reused the stripped polyacrylate (PAA) adhesive as an adsorbent to reduce solid waste generation. When the WSPF was treated in 1 mol/L NaOH solution at 90 °C, the PAA hydrolyzed to two main by-products of 1-butanol and 2-ethylhexanol, weakening the binding strength between PAA and PET and then efficient separation of them. Further bench-scale test revealed that over 97.2% of detachment efficiency toward PAA was achieved during continuous treatment of 17 batches of WSPF (200 g for each) without supplement of NaOH and generation of wastewater. Meanwhile, the economic evaluation indicated that the recycling method would generate a net profit margin of 647% for the second year without considering the incurrence of new cost and input. Additionally, the pyrolysis of waste PAA enabled its conversion into potential adsorbent, which showed 2 to 4 times enhanced adsorption capacity toward styrene and ethyl acetate after modification with NaOH solution. This study provides a green method for recycling waste plastics and inspires a referable solution for solid waste treatment in the smartphone industry.

Abstract Image

废弃智能手机保护膜的绿色处理:效率、机理、台架试验和二次废物再利用
智能手机的生产和淘汰产生了大量废弃塑料配件(如废弃智能手机保护膜(WSPF)),具有巨大的回收潜力。然而,现有的回收技术存在基材损坏和产生二次污染物等局限性。本研究旨在开发一种绿色处理方法,不仅能回收 WSPF 中的聚对苯二甲酸乙二醇酯(PET),还能将剥离的聚丙烯酸酯(PAA)粘合剂作为吸附剂重新利用,以减少固体废物的产生。将 WSPF 在 1 mol/L NaOH 溶液中于 90 °C 下处理时,PAA 会水解为两种主要副产物 1-丁醇和 2-乙基己醇,从而减弱 PAA 与 PET 之间的结合强度,进而实现有效分离。进一步的台架试验表明,在不添加 NaOH 和不产生废水的情况下,连续处理 17 批 WSPF(每批 200 克),PAA 的分离效率超过 97.2%。同时,经济评价表明,在不考虑新增成本和投入的情况下,回收方法第二年的净利润率为 647%。此外,废 PAA 的热解使其转化为潜在的吸附剂,经 NaOH 溶液改性后,对苯乙烯和乙酸乙酯的吸附能力提高了 2 至 4 倍。这项研究为废塑料的回收利用提供了一种绿色方法,并为智能手机行业的固体废物处理提供了一种可参考的解决方案。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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