TY - JOUR
T1 - Exploring the adsorption behavior of benzotriazoles and benzothiazoles on polyvinyl chloride microplastics in the water environment
AU - Yu, Yanbin
AU - Li, Huichen
AU - Chen, Jinfeng
AU - Wang, Fangjie
AU - Chen, Xiaoning
AU - Huang, Bowen
AU - He, Yu
AU - Cai, Zongwei
N1 - This work was supported by the National Natural Science Foundation of China (No. 22036001 ), and the Major Project of Science and Technology of Fujian Province (No. 2020HZ06006 ).
Publisher Copyright:
© 2022
PY - 2022/5/15
Y1 - 2022/5/15
N2 - As a kind of emerging pollutant, microplastics (MPs) play an important role as a carrier for pollutant migration in the water environment. Carried by the MPs, benzotriazoles, and benzothiazoles (collectively referred to as BTs)1 are ubiquitous water contaminants. In this paper, the adsorption behavior of BTs on polyvinyl chloride (PVC) MPs was first studied systematically to explain the adsorptive mechanisms and the consequential pollution caused by the absorption-desorption process. The studies on kinetics, isotherms, and thermodynamics revealed that the adsorption of BTs on PVC MPs was a multi-rate, heterogeneous multi-layer, and exothermic process, which was affected by external diffusion, intra-particle diffusion, and dynamic equilibrium. The factors including pH, salinity, and particle size also influenced the adsorption process. In the multi-solute system, competitive adsorption would occur between different BTs. The desorption of BTs from PVC MPs was positively associated with the increase of adsorption amount. Based on the results, the adsorption mechanisms of PVC MPs were clarified, involving hydrophobic interaction, electrostatic force, and non-covalent bonds. It was demonstrated that BTs in the water environment could most probably be accumulated and migrated through MPs, and eventually carried into organisms, posing an increased risk to the ecological environment.
AB - As a kind of emerging pollutant, microplastics (MPs) play an important role as a carrier for pollutant migration in the water environment. Carried by the MPs, benzotriazoles, and benzothiazoles (collectively referred to as BTs)1 are ubiquitous water contaminants. In this paper, the adsorption behavior of BTs on polyvinyl chloride (PVC) MPs was first studied systematically to explain the adsorptive mechanisms and the consequential pollution caused by the absorption-desorption process. The studies on kinetics, isotherms, and thermodynamics revealed that the adsorption of BTs on PVC MPs was a multi-rate, heterogeneous multi-layer, and exothermic process, which was affected by external diffusion, intra-particle diffusion, and dynamic equilibrium. The factors including pH, salinity, and particle size also influenced the adsorption process. In the multi-solute system, competitive adsorption would occur between different BTs. The desorption of BTs from PVC MPs was positively associated with the increase of adsorption amount. Based on the results, the adsorption mechanisms of PVC MPs were clarified, involving hydrophobic interaction, electrostatic force, and non-covalent bonds. It was demonstrated that BTs in the water environment could most probably be accumulated and migrated through MPs, and eventually carried into organisms, posing an increased risk to the ecological environment.
KW - Adsorption
KW - Benzothiazoles
KW - Benzotriazoles
KW - Endocrine-disrupting chemicals
KW - Polyvinyl chloride microplastics
UR - http://www.scopus.com/inward/record.url?scp=85123946127&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2022.153471
DO - 10.1016/j.scitotenv.2022.153471
M3 - Journal article
C2 - 35101490
AN - SCOPUS:85123946127
SN - 0048-9697
VL - 821
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 153471
ER -
