Adsorption mechanisms of five bisphenol analogues on PVC microplastics

The Science of the Total Environment
Pengfei WuYuanyuan Tang

Abstract

Polyvinyl chloride (PVC) plastics are easily embrittled and decomposed to microplastics in an aquatic environment. The plasticizers such as bisphenol A (BPA), bisphenol S (BPS) and their analogues might be released and adsorbed by the PVC microplastics causing consequential pollution to the ecosystem. Herein, a systematic study was performed to determine the adsorption mechanisms of five bisphenol analogues (BPA, BPS, BPF, BPB and BPAF) on PVC microplastics. The maximum adsorption efficiency reached 0.19 ± 0.02 mg·g-1 (BPA), 0.15 ± 0.01 mg·g-1 (BPS), 0.16 ± 0.01 mg·g-1 (BPF), 0.22 ± 0.01 mg·g-1 (BPB), and 0.24 ± 0.02 mg·g-1 (BPAF) at PVC dosage of 1.5 g·L-1. The kinetics study shows that the adsorption processes can be divided into three stages including external mass transport, intraparticle diffusion and dynamic equilibrium. The isotherm modeling shows a better fit of the adsorption results to the Freundlich isotherm compared to the Langmuir model. The thermodynamic study indicates the adsorption of all bisphenols as exothermic processes. Furthermore, the adsorption mechanisms of bisphenols were explicated intensively, with respect to hydrophobic interactions, electrostatic forces, and noncovalent bonds. A positive effect of ...Continue Reading

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Dec 6, 2019·Environmental Technology·Taynara Basso VidovixAngélica Marquetotti Salcedo Vieira
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