Journal
MARINE POLLUTION BULLETIN
Volume 138, Issue -, Pages 458-463Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2018.11.055
Keywords
Microplastic; Model; Sorption; 3,6-Dibromocarbazole; 1,3,6,8-Tetrabromocarbazole
Funding
- National Key R&D Program of China [2017YFC1404504]
- National Natural Science Foundation of China [41807499]
- Basic Scientific Fund for National Public Research Institutes of China [2016Q07]
- China-German Cooperation in Marine Biology [QY0518016]
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Microplastics and organic pollutants are typical contaminants in the marine environment. However, little is known about their interactions. In this study, the sorption of 3,6-Dibromocarbazole(3,6-BCZ) and 1,3,6,8-Tetrabromocarbazole (1,3,6,8-BCZ) by Polypropylene microplastic in simulated seawater was studied. Factors, including particle size, salinity and concentration, were investigated, and the experimental results were simulated using a mathematical model. Results showed that the pseudo-second-order kinetic model was more suitable to describe the sorption of polyhalogenated carbazole by microplastics, with equilibrium sorption times of 6 h and 8h for 3,6-BCZ and 1,3,6,8-BCZ, respectively. Sorption capacity increased with decreasing particle size and the adsorption capacity increased initially and then decreased with increasing salinity, with a maximum sorption occurring at salinity of 14%. Moreover, the sorption amount increased with the increasing concentration of polyhalogenated carbazole. The sorption isotherms were confirmed as the extended Langmuir model and the extended Freundlich model, both of which were S-type.
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