TY - JOUR
T1 - Effects of hydroxyl group content on adsorption and desorption of anthracene and anthrol by polyvinyl chloride microplastics
AU - Bao, Zhen Zong
AU - Chen, Zhi Feng
AU - Lu, Si Qi
AU - Wang, Guangzhao
AU - Qi, Zenghua
AU - Cai, Zongwei
N1 - This work was supported by the Science and Technology Program of Guangzhou , China [grant number 202102021010 ]; the Science and Technology Planning Project of Guangdong Province [grant number 2020B1212030008 ]; the National Natural Science Foundation of China [grant number 91543202 ]; and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [grant number 2017BT01Z032 ].
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/10/10
Y1 - 2021/10/10
N2 - Pollutant-attached microplastics have received increasing attention in recent years. However, information regarding the influence of hydroxyl group content of pollutants on the adsorption and desorption behavior is unclear, which affects their fate and risks in the aquatic environment. In this study, we investigated the adsorption and desorption behavior of anthracene (ANT) and its hydroxy derivatives (OHAs), including 2-hydroxyanthracene (MOHA), 2,6-dihydroxyanthracene (DOHA), and 1,8,9-trihydroxyanthracene (TOHA) on polyvinyl chloride (PVC) microplastics, and their interaction mechanism through the batch, characterization, and computational experiments. The results showed that the adsorption of ANT and OHAs on PVC microplastics conformed to the pseudo-second-order kinetic model and was exothermic spontaneously. The adsorption efficiency on PVC followed the order of ANT > MOHA > DOHA > TOHA, indicating that increase in hydroxyl group substitution degree will inhibit pollutant adsorption on PVC microplastics. Conversely, the release amounts of MOHA from PVC into simulated gastric fluids were higher than those of ANT. Experimental and computational results suggested that the affinity of ANT/OHAs to PVC microplastics was the most likely outcome in hydrophobic effect, electrostatic repulsion, and CH-π interaction forces. These findings help elucidate the mechanisms of pollutant adsorption on microplastics and evaluate the risk of pollutant-attached microplastics in the aquatic environment.
AB - Pollutant-attached microplastics have received increasing attention in recent years. However, information regarding the influence of hydroxyl group content of pollutants on the adsorption and desorption behavior is unclear, which affects their fate and risks in the aquatic environment. In this study, we investigated the adsorption and desorption behavior of anthracene (ANT) and its hydroxy derivatives (OHAs), including 2-hydroxyanthracene (MOHA), 2,6-dihydroxyanthracene (DOHA), and 1,8,9-trihydroxyanthracene (TOHA) on polyvinyl chloride (PVC) microplastics, and their interaction mechanism through the batch, characterization, and computational experiments. The results showed that the adsorption of ANT and OHAs on PVC microplastics conformed to the pseudo-second-order kinetic model and was exothermic spontaneously. The adsorption efficiency on PVC followed the order of ANT > MOHA > DOHA > TOHA, indicating that increase in hydroxyl group substitution degree will inhibit pollutant adsorption on PVC microplastics. Conversely, the release amounts of MOHA from PVC into simulated gastric fluids were higher than those of ANT. Experimental and computational results suggested that the affinity of ANT/OHAs to PVC microplastics was the most likely outcome in hydrophobic effect, electrostatic repulsion, and CH-π interaction forces. These findings help elucidate the mechanisms of pollutant adsorption on microplastics and evaluate the risk of pollutant-attached microplastics in the aquatic environment.
KW - Adsorption
KW - Anthracene
KW - Hydroxyl group content
KW - Mechanism
KW - Microplastics
KW - Simulated gastric fluid
UR - http://www.scopus.com/inward/record.url?scp=85107134735&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.148077
DO - 10.1016/j.scitotenv.2021.148077
M3 - Journal article
C2 - 34090159
AN - SCOPUS:85107134735
SN - 0048-9697
VL - 790
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 148077
ER -
