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Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification

The dramatic increase in waste plastics has caused harm to both human health and the environment. Due to the variety of plastic products and their complex components, it is a technical challenge to effectively separate them. High density polyethylene (HDPE) and polyvinyl chloride (PVC) both have a h...

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Main Authors: Wang, Yinan, Zhao, Yue, Guo, Linyi, Han, Fengrong, Li, Xiaofeng
Format: Article
Language:English
English
Published: Elsevier Ltd 2022
Subjects:
T Technology (General)
TA Engineering (General). Civil engineering (General)
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://umpir.ump.edu.my/id/eprint/42751/1/Enhanced%20flotation%20of%20high%20density%20polyethylene%20and%20polyvinyl%20chloride.pdf
http://umpir.ump.edu.my/id/eprint/42751/2/Enhanced%20flotation%20of%20high%20density%20polyethylene%20and%20polyvinyl%20chloride%20mixtures%20based%20on%20clean%20corona%20modification_ABS.pdf
http://umpir.ump.edu.my/id/eprint/42751/
https://doi.org/10.1016/j.pce.2022.103264
https://doi.org/10.1016/j.pce.2022.103264
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spelling my.ump.umpir.427512025-01-07T04:01:16Z http://umpir.ump.edu.my/id/eprint/42751/ Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification Wang, Yinan Zhao, Yue Guo, Linyi Han, Fengrong Li, Xiaofeng T Technology (General) TA Engineering (General). Civil engineering (General) TK Electrical engineering. Electronics Nuclear engineering The dramatic increase in waste plastics has caused harm to both human health and the environment. Due to the variety of plastic products and their complex components, it is a technical challenge to effectively separate them. High density polyethylene (HDPE) and polyvinyl chloride (PVC) both have a high detection frequency in the common solid waste streams like automobile shredder residue (ASR), and due to the similar properties of different plastics, their mixtures lack reliable separation methods. Specifically for this kind of mixtures, this work provided a novel separation strategy with prepositive corona modification and postpositive flotation units. To obtain the optimal separation parameters, flotation performance of HDPE and PVC were investigated under different modification conditions controlled by the corona polarity, discharge power and exposure time. Besides, the modification mechanism was revealed through multi-characterization tests on surface morphology, molecular weight, contact angle, and spectrums. The results showed that corona discharge can generate non-thermal plasma to activate the surfaces of HDPE and PVC, thereby increasing their floatability difference. Under the optimal conditions of 300 W positive discharge power and 8000 ms exposure time, HDPE turned into the sinking tail while PVC still accumulated in the floating product, leading to the maximum separation recovery and purity of 96.36% and 97.01%, respectively. Amorphous low-molecular weight oxidic substances emerged on the upper layer of polymers was verified by the multi-characterization, representing in varying degrees of oxidation and chain scission (HDPE > PVC). Since the corona modification is reagent-free-addition and rapid in-line process, this work showed great advantages in the total cost of separation (only 450.03 USD/t) and potential environmental benefits, which also paves a clean way for the recycling of HDPE and PVC. Elsevier Ltd 2022-12 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/42751/1/Enhanced%20flotation%20of%20high%20density%20polyethylene%20and%20polyvinyl%20chloride.pdf pdf en http://umpir.ump.edu.my/id/eprint/42751/2/Enhanced%20flotation%20of%20high%20density%20polyethylene%20and%20polyvinyl%20chloride%20mixtures%20based%20on%20clean%20corona%20modification_ABS.pdf Wang, Yinan and Zhao, Yue and Guo, Linyi and Han, Fengrong and Li, Xiaofeng (2022) Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification. Physics and Chemistry of the Earth, 128 (103264). pp. 1-7. ISSN 1474-7065. (Published) https://doi.org/10.1016/j.pce.2022.103264 https://doi.org/10.1016/j.pce.2022.103264
institution Universiti Malaysia Pahang Al-Sultan Abdullah
building UMPSA Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang Al-Sultan Abdullah
content_source UMPSA Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
English
topic T Technology (General)
TA Engineering (General). Civil engineering (General)
TK Electrical engineering. Electronics Nuclear engineering
spellingShingle T Technology (General)
TA Engineering (General). Civil engineering (General)
TK Electrical engineering. Electronics Nuclear engineering
Wang, Yinan
Zhao, Yue
Guo, Linyi
Han, Fengrong
Li, Xiaofeng
Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification
description The dramatic increase in waste plastics has caused harm to both human health and the environment. Due to the variety of plastic products and their complex components, it is a technical challenge to effectively separate them. High density polyethylene (HDPE) and polyvinyl chloride (PVC) both have a high detection frequency in the common solid waste streams like automobile shredder residue (ASR), and due to the similar properties of different plastics, their mixtures lack reliable separation methods. Specifically for this kind of mixtures, this work provided a novel separation strategy with prepositive corona modification and postpositive flotation units. To obtain the optimal separation parameters, flotation performance of HDPE and PVC were investigated under different modification conditions controlled by the corona polarity, discharge power and exposure time. Besides, the modification mechanism was revealed through multi-characterization tests on surface morphology, molecular weight, contact angle, and spectrums. The results showed that corona discharge can generate non-thermal plasma to activate the surfaces of HDPE and PVC, thereby increasing their floatability difference. Under the optimal conditions of 300 W positive discharge power and 8000 ms exposure time, HDPE turned into the sinking tail while PVC still accumulated in the floating product, leading to the maximum separation recovery and purity of 96.36% and 97.01%, respectively. Amorphous low-molecular weight oxidic substances emerged on the upper layer of polymers was verified by the multi-characterization, representing in varying degrees of oxidation and chain scission (HDPE > PVC). Since the corona modification is reagent-free-addition and rapid in-line process, this work showed great advantages in the total cost of separation (only 450.03 USD/t) and potential environmental benefits, which also paves a clean way for the recycling of HDPE and PVC.
format Article
author Wang, Yinan
Zhao, Yue
Guo, Linyi
Han, Fengrong
Li, Xiaofeng
author_facet Wang, Yinan
Zhao, Yue
Guo, Linyi
Han, Fengrong
Li, Xiaofeng
author_sort Wang, Yinan
title Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification
title_short Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification
title_full Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification
title_fullStr Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification
title_full_unstemmed Enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification
title_sort enhanced flotation of high density polyethylene and polyvinyl chloride mixtures based on clean corona modification
publisher Elsevier Ltd
publishDate 2022
url http://umpir.ump.edu.my/id/eprint/42751/1/Enhanced%20flotation%20of%20high%20density%20polyethylene%20and%20polyvinyl%20chloride.pdf
http://umpir.ump.edu.my/id/eprint/42751/2/Enhanced%20flotation%20of%20high%20density%20polyethylene%20and%20polyvinyl%20chloride%20mixtures%20based%20on%20clean%20corona%20modification_ABS.pdf
http://umpir.ump.edu.my/id/eprint/42751/
https://doi.org/10.1016/j.pce.2022.103264
https://doi.org/10.1016/j.pce.2022.103264
_version_ 1822924882139152384
score 13.232414

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