TY - JOUR
T1 - Adsorption mechanisms of five bisphenol analogues on PVC microplastics
AU - Wu, Pengfei
AU - CAI, Zongwei
AU - Jin, Hangbiao
AU - Tang, Yuanyuan
N1 - Funding Information:
This work is supported financially by the National Natural Science Foundation of China (NSFC) ( 21707063 ) and the Shenzhen Science and Technology Innovation Committee ( JCYJ20150601155130432 ; JCYJ20160429191618506 ). This work is also sponsored by the Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control (No. 2017B030301012 ).
PY - 2019/2/10
Y1 - 2019/2/10
N2 - 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 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.
AB - 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 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.
KW - Adsorption mechanisms
KW - Bisphenol analogues
KW - Isotherms
KW - Kinetics
KW - Microplastics
KW - Thermodynamics
UR - http://www.scopus.com/inward/record.url?scp=85053060129&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2018.09.049
DO - 10.1016/j.scitotenv.2018.09.049
M3 - Journal article
C2 - 30212696
AN - SCOPUS:85053060129
SN - 0048-9697
VL - 650
SP - 671
EP - 678
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -
