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Adsorption mechanisms of five bisphenol analogues on PVC microplastics

The Science of The Total Environment 2018 549 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Pengfei Wu, Pengfei Wu, Pengfei Wu, Pengfei Wu, Pengfei Wu, Pengfei Wu, Pengfei Wu, Pengfei Wu, Zongwei Cai Pengfei Wu, Pengfei Wu, Pengfei Wu, Zongwei Cai Zongwei Cai Yuanyuan Tang, Yuanyuan Tang, Yuanyuan Tang, Yuanyuan Tang, Yuanyuan Tang, Yuanyuan Tang, Pengfei Wu, Pengfei Wu, Pengfei Wu, Zongwei Cai Yuanyuan Tang, Yuanyuan Tang, Zongwei Cai Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Yuanyuan Tang, Yuanyuan Tang, Yuanyuan Tang, Zongwei Cai Zongwei Cai Pengfei Wu, Yuanyuan Tang, Pengfei Wu, Yuanyuan Tang, Hangbiao Jin, Yuanyuan Tang, Zongwei Cai Pengfei Wu, Yuanyuan Tang, Zongwei Cai Zongwei Cai Yuanyuan Tang, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Hangbiao Jin, Zongwei Cai Pengfei Wu, Pengfei Wu, Zongwei Cai Zongwei Cai Zongwei Cai Hangbiao Jin, Zongwei Cai Zongwei Cai Zongwei Cai Zongwei Cai Zongwei Cai Yuanyuan Tang, Zongwei Cai Yuanyuan Tang, Yuanyuan Tang, Pengfei Wu, Yuanyuan Tang, Pengfei Wu, Yuanyuan Tang, Yuanyuan Tang, Yuanyuan Tang, Zongwei Cai Zongwei Cai Yuanyuan Tang, Yuanyuan Tang, Pengfei Wu, Hangbiao Jin, Zongwei Cai Zongwei Cai Zongwei Cai Zongwei Cai Yuanyuan Tang, Zongwei Cai Yuanyuan Tang, Zongwei Cai Zongwei Cai Zongwei Cai Yuanyuan Tang, Zongwei Cai Zongwei Cai Yuanyuan Tang, Zongwei Cai

Summary

The adsorption of five bisphenol analogues (BPA, BPS, BPF, BPB, BPAF) onto PVC microplastics was studied, finding maximum adsorption efficiencies of 0.15–0.24 mg/g and identifying a three-stage kinetic process involving surface transport and intraparticle diffusion. The study reveals that PVC microplastics can adsorb plasticizer bisphenol compounds at significant levels, creating a potential feedback loop of chemical re-release in aquatic environments.

Polymers

PVC

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 (BPA), 0.15 ± 0.01 mg·g (BPS), 0.16 ± 0.01 mg·g (BPF), 0.22 ± 0.01 mg·g (BPB), and 0.24 ± 0.02 mg·g (BPAF) at PVC dosage of 1.5 g·L. 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 hydrophobic interactions was identified for bisphenols adsorption on PVC microplastics, but an obvious inhibition by electrostatic repulsions was revealed for BPF due to its ionization in the neutral solution. In addition, noncovalent bonds (hydrogen and halogen bonds) may promote the adsorption of bisphenols on PVC microplastics. Finally, the desorption and competitive adsorption of five bisphenol analogues on the microplastics were provided together with a perspective for future works.

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