TY - JOUR
T1 - Sorption of bisphenol A onto microplastics and associated environmental risks in comparison to engineered carbonous materials and natural media
AU - Tang, Shuai
AU - Ma, Shengjia
AU - Zhang, Tao
AU - Liu, Xuemin
AU - Nahid Pervez, Md
AU - Cao, Chengjin
AU - Zhao, Yaping
N1 - Publisher Copyright:
© 2023 International Association for Gondwana Research
PY - 2023/5
Y1 - 2023/5
N2 - Microplastics (MPs) have been proven to be a vector for the migration of hydrophobic organic pollutants in the water system. However, the potential environmental risks of MPs compared with typical environmental materials are still unknown. In this work, the potential risks of MPs (high-density polyethylene (HDPE) and polyamide (PA)), engineered carbonous materials (active carbon (AC), graphene oxide (GO), and multi-walled nanotubes (MWCNTs)), and natural media (Soil and Sediment) were evaluated by comparing their interfacial behaviors to bisphenol A (BPA) under various environmental conditions. The maximum sorption capacities of BPA on those materials followed the order of AC (179 mg/g) > MWCNTs (73.5 mg/g) > PA (69.0 mg/g) > GO (44.1 mg/g) >> Soil (0.601 mg/g) > Sediment (0.164 mg/g) ≈ HDPE (0.163 mg/g). The main sorption mechanisms of BPA on GO were H-bonds and π-π interactions, while those on AC and MWCNTs were π-π interactions. Hydrophobic interaction played a dominant role in the sorption of BPA on Soil, Sediment, and HDPE, whereas PA bound to BPA primarily through H-bonds. Density functional theory (DFT) simulation also confirmed the predominant mechanism of hydrophobic interaction (−6.01 kcal/mol) between BPA and HDPE as well as H-bonds (−8.43 kcal/mol) between BPA and PA. Besides, solution pH, humic acid (HA), salinity, water matrices, and coexisting 17β-Estradiol (E2) played roles in the sorption of BPA. Based on the current abundance of carbonous materials and MPs in real environments, the calculated relative desorbed capacity (RDC) of BPA suggested that the predicted environmental risk of MPs was similar to that of engineered carbonaceous materials but much lower than that of natural media. Our findings highlight that the sorption behaviors and potential risks of MPs in real environments highly depend on the structural properties of MPs, in which surface functional groups are particularly important.
AB - Microplastics (MPs) have been proven to be a vector for the migration of hydrophobic organic pollutants in the water system. However, the potential environmental risks of MPs compared with typical environmental materials are still unknown. In this work, the potential risks of MPs (high-density polyethylene (HDPE) and polyamide (PA)), engineered carbonous materials (active carbon (AC), graphene oxide (GO), and multi-walled nanotubes (MWCNTs)), and natural media (Soil and Sediment) were evaluated by comparing their interfacial behaviors to bisphenol A (BPA) under various environmental conditions. The maximum sorption capacities of BPA on those materials followed the order of AC (179 mg/g) > MWCNTs (73.5 mg/g) > PA (69.0 mg/g) > GO (44.1 mg/g) >> Soil (0.601 mg/g) > Sediment (0.164 mg/g) ≈ HDPE (0.163 mg/g). The main sorption mechanisms of BPA on GO were H-bonds and π-π interactions, while those on AC and MWCNTs were π-π interactions. Hydrophobic interaction played a dominant role in the sorption of BPA on Soil, Sediment, and HDPE, whereas PA bound to BPA primarily through H-bonds. Density functional theory (DFT) simulation also confirmed the predominant mechanism of hydrophobic interaction (−6.01 kcal/mol) between BPA and HDPE as well as H-bonds (−8.43 kcal/mol) between BPA and PA. Besides, solution pH, humic acid (HA), salinity, water matrices, and coexisting 17β-Estradiol (E2) played roles in the sorption of BPA. Based on the current abundance of carbonous materials and MPs in real environments, the calculated relative desorbed capacity (RDC) of BPA suggested that the predicted environmental risk of MPs was similar to that of engineered carbonaceous materials but much lower than that of natural media. Our findings highlight that the sorption behaviors and potential risks of MPs in real environments highly depend on the structural properties of MPs, in which surface functional groups are particularly important.
KW - Density functional theory simulation
KW - High-density polyethylene
KW - Polyamide
KW - Relative desorbed capacity
KW - Sorption mechanisms
UR - https://www.scopus.com/pages/publications/85149070733
U2 - 10.1016/j.gr.2023.02.014
DO - 10.1016/j.gr.2023.02.014
M3 - 文章
AN - SCOPUS:85149070733
SN - 1342-937X
VL - 117
SP - 295
EP - 306
JO - Gondwana Research
JF - Gondwana Research
ER -