Adsorption behavior of Methylene Blue and Rhodamine B on microplastics before and after ultraviolet irradiation - Publication - Bridge of Knowledge

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Adsorption behavior of Methylene Blue and Rhodamine B on microplastics before and after ultraviolet irradiation

Abstract

The accumulation of microplastics (MPs) and dyes has attracted extensive attention because of their environ mental effects, which will be exacerbated especially after the aging of MPs. This study aimed at investigating the significance of Methylene Blue (MB) and Rhodamine B (RhB) adsorption behavior by PLA (polylactic acid) and PA66 (Polyamide 66) MPs after UV aging. After aging, there was an observed increase in the hydrophilicity, specific surface area, and oxygen content of MPs. The results indicate that aging enhances the adsorption ca pacity of both PLA and PA66. Furthermore, it is noteworthy that PLA undergoes more significant changes in its physicochemical properties compared to PA66 following aging. The adsorption process conformed the pseudosecond order (PSO) kinetic model and Langmuir isotherm well, and the adsorption capacity followed the sequence of aged-PLA > aged-PA66 > pristine-PA66 > pristine-PLA. Besides, the adsorption of dyes onto the MPs was studied across four variables (pH, salinity, surfactants, and dissolved organic matter). The aforementioned findings collectively demonstrate that the aged MPs still exhibit a higher adsorption capacity than the pristine MPs. In desorption experiments, the desorption efficiency of MB (PLA) was reduced from 35.29 % (P-PLA) to 32.76 % (A-PLA), and the similar trend was observed on other aged MPs. These findings suggest that aged MPs

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS no. 699,
ISSN: 0927-7757
Language:
English
Publication year:
2024
Bibliographic description:
Li J., Wang K., Wang K., Liang S., Guo C., Hassan A., Wang J.: Adsorption behavior of Methylene Blue and Rhodamine B on microplastics before and after ultraviolet irradiation// COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS -,iss. volume 699 (2024), s.134671-
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.colsurfa.2024.134671
Sources of funding:
  • Free publication
Verified by:
Gdańsk University of Technology

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