Adsorption behavior of heavy metals onto microplastics derived from conventional and biodegradable commercial plastic products.

Autor: Chen PW; Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, Taichung 40249, Taiwan., Hsiao MN; Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan., Xiao LW; Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan., Liu ZS; Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan; Center for Sustainability and Energy Technologies, Chang Gung University, Taoyuan 33302, Taiwan; Chronic Diseases and Health Promotion Research Center, Chang Gung University of Science and Technology, Chiayi 61363, Taiwan; Biochemical Technology R&D center, Ming Chi University of Technology, New Taipei City 24301, Taiwan. Electronic address: zsliu@mail.mcut.edu.tw.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Nov 15; Vol. 951, pp. 175537. Date of Electronic Publication: 2024 Aug 14.
DOI: 10.1016/j.scitotenv.2024.175537
Abstrakt: This study extensively explored the adsorption behavior of heavy metals (Pb +2 , Ni +2 , Cu +2 , Zn +2 , and Cd +2 ) onto microplastics (MPs). The particle sizes of MPs ranged from 0.149 to 0.25 mm. The microplastics were generated from commercial products manufactured from both conventional (polyethylene (PE) bottle, polystyrene (PS) spoon, and polyethylene terephthalate (PET) egg carton) and biodegradable (polylactic acid (PLA) spoon, and polylactic acid (PLA) egg carton) plastics. The study also considered the influence of solution pH on the adsorption capacity of heavy metals. Regarding the adsorption potential for Cu +2 , the ranking was as follows: PLA-egg (1408 μg·g -1 ) > PLA-spoon (735 μg·g -1 ) > PE-bottle (315 μg·g -1 ) > PET-egg (283 μg·g -1 ) > PS-spoon (237 μg·g -1 ). PLA MPs showed the highest adsorption capacity due to the lower thermal stability and higher presence of surface oxygen functional groups. Moreover, the adsorption capacities of the five metals onto PLA-spoon and PLA-egg decreased in the following order: Pb (1785 μg·g -1 ) > Zn (1267 μg·g -1 ) > Cd (748 μg·g -1 ) > Cu (735 μg·g -1 ) > Ni (722 μg·g -1 ), and Pb (1520 μg·g -1 ) > Ni (1412 μg·g -1 ) > Cu (1408 μg·g -1 ) > Zn (1118 μg·g -1 ) > Cd (423 μg·g -1 ), respectively. The SEM-EDS, FTIR and XPS results demonstrated that surface oxygen-containing functional groups play an important role during the adsorption process. This study extended its analysis to quantify the metal content of the post-adsorption MPs, revealing uneven adsorption of heavy metals onto the MPs. This implies that the diversity of commercial plastic products may result in significant variations in their ability to adsorb heavy metals, underscoring the importance of effectively managing discarded commercial plastic products.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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