期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 806, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.150779
关键词
Plastic waste; Polyolefin; Biodegradation; Lcp(K30)
资金
- National Key Research and Develop-ment Program of China [2019YFA0706900]
- Jiangsu Provincial Science and Technology Department Policy Guidance Program-International Cooperation Projects Innovation cooperation project of BR [BZ2020010]
The study found that latex clearing protein can effectively degrade UV-oxidized polyethylene and polypropylene, with no significant effects on polystyrene. The treated samples showed more cracks and pits, as well as a decrease in molecular weight.
Plastic products made of polyethylene (PE), polypropylene (PP), and polystyrene (PS) are widely used in daily life and industrial production. Polyolefins-which have a very stable structure and do not contain any active molecular groups-are difficult to degrade and pose a serious global environment threat. This study selected latex clearing protein (Lcp(K30)) derived from Streptomyces sp. Strain K30. The natural substrate of the enzyme is rubber (cis-1, 4-polyisoprene), and the site of action is the carbon-carbon double bond. Lcp(K30) was incubated with UV-irradiated polyolefin PE, PP and PS (UV-PE. UV-PP, and UV-PS containing carbon-carbon double bonds) for 5 d at 37 degrees C. The results showed that UV-PE-Lcp(K30) was more fragmented than UV-PE-blank: the Fourier transform infrared spectroscopy results showed that UV-PE-Lcp(K30) and UV-PP-Lcp(K30) produced new active groups (e.g., OH and -C=O): however, the effect on UV-PS was not significant. Scanning electron microscopy results showed that the treated group had more obvious roughness, cracks, and pits than the control group. The results of high-temperature gel permeation chromatography showed that the average molecular weight (M-w) of UV-PE-Lcp(K30) and UV-PP-Lcp(K30) decreased; the M-w of UV-PE5-Lcp(K30) was reduced by 42.02%. The results of gas chromatography-mass spectrometry showed the production of ketones. Therefore, the Lcp(K30) latex clearing protein degrade UV-oxidized polyolefin plastics and has great potential for PE and PP degradation but may not be suitable for PS. Furthermore, other Lcps (such as Lcp(NRRL), Lcp(NVL3)) can also degrade UV-PE. (C) 2021 Published by Elsevier B.V.
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