期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 404, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124159
关键词
Microplastics; Polypropylene; Aging process; AFM-IR; Nanoscale characterization
资金
- Key Research and Development Projects of Xinjiang Uygur Autonomous Region [2017B03014]
- National Natural Science Foundation of China [21806140]
- China Postdoctoral Science Foundation [2019M662105]
- Natural Science Foundation of Zhejiang Province [LY20B070010]
- Zhejiang University of Technology [2017129004429]
This study successfully prepared nano-TiO2 coated polypropylene MPs and investigated the nanoscale infrared, thermal, and mechanical properties of MPs before and after photo-aging using a combined AFM-IR technique. The MPs became stiffer after photo-aging, especially in the components surrounding the nano-TiO2 particle, indicating that photocatalytic reaction accelerated the aging process. The findings provide insights into the changes in surface microstructures, physical properties, and chemical compositions of MPs during the aging process.
Microplastics (MPs) are considered to have greater environmental hazards than large plastics. Most MPs undergo different degrees of aging and aged MPs exhibit different physicochemical properties from pristine ones. This study successfully prepared a nano-TiO2 coated polypropylene MPs, and explored the nanoscale infrared, thermal, and mechanical properties of MPs before and after photo-aging using a combined AFM-IR technique. Surface height range of MPs was +/- 25 nm. The signal intensity of the absorption peak at 1654 cm(-1) in terms of vinylidene end groups gradually increased as the irradiation time prolonged. The softening temperature of MPs decreased from 126.7 degrees C to 108.5 degrees C as the irradiation time increased from 0 h to 4 h. The MPs after photo-aging became stiffer, especially for the components surrounding the nano-TiO2 particle, indicating that photocatalytic reaction accelerated the aging process of MPs. The resonance frequency of MPs surrounding the nano-TiO2 particle was stronger after photo-aging and the stiffer components were uniformly distributed, confirming that the thermal and mechanical properties of MPs changed after photo-aging. These novel findings are essential to better understand the changes in the surface microstructures, physical properties, and chemical compositions of MPs during aging process.
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