Microplastics & organics - a comparative study of sorption of triclosan and malachite green onto polyethylene

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Date

2023-02-01

Author

Ciftci, Goekce
Turkeli, Ulku Dide
Ozen, Elif Yaren
Özdemir, Melek
Sanin, Faika Dilek
İmamoğlu, İpek

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This study aims to elucidate interaction of organics with microplastics in a comparative manner via the use of two model compounds (i.e., triclosan and malachite green) having different physicochemical properties, onto polyethylene (PE). TCS, is hydrophobic with low solubility , while MG is hydrophilic with high aqueous solubility. Kinetic studies indicate faster sorption (t(eq) = 24 h) and equilibrium studies show much higher capacity (q(e) = 6,921 mg/g) for TCS, when compared to those of MG (t(eq) = 5 d, q(e) = 221 mg/g). While pseudo-kinetic model fits sorption of both organics to PE, equilibrium isotherms as well as the results on effect of particle size and pH indicate dissimilar sorption mechanisms. Considering pH(PZC)= 2, observation of favourable sorption of TCS in acidic region and sorption being unaffected by particle size was explained by TCS sorption to be dominated by hydrophobic interactions in amorph regions of PE. Higher removal of MG was observed at lower surface charge of PE, and a clear favourable impact of surface area on MG sorptive capacit y pointed to the presence of non-specific van der Waals type interactions on the surface of PE. Mechanistic evaluations presented here contribute to our understanding of interaction of MPs with organics in aquatic ecosystems.

Subject Keywords

hydrophobic interaction, malachite green, mechanism, microplastics, sorption, triclosan, ADSORPTION, CHLORIDE

URI

https://hdl.handle.net/11511/102714

Journal

WATER SCIENCE AND TECHNOLOGY

DOI

https://doi.org/10.2166/wst.2023.040

Collections

Department of Environmental Engineering, Article

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Citation Formats

G. Ciftci, U. D. Turkeli, E. Y. Ozen, M. Özdemir, F. D. Sanin, and İ. İmamoğlu, “Microplastics & organics - a comparative study of sorption of triclosan and malachite green onto polyethylene,” WATER SCIENCE AND TECHNOLOGY, pp. 0–0, 2023, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/102714.