TY - JOUR
T1 - Adsorption of Pb(II) by UV-aged microplastics and cotransport in homogeneous and heterogeneous porous media
AU - Chang, Bokun
AU - Huang, Zixuan
AU - Yang, Xiaodong
AU - Yang, Tianhuan
AU - Fang, Xianhui
AU - Zhong, Xianbao
AU - Ding, Wei
AU - Cao, Gang
AU - Yang, Yajun
AU - Hu, Feinan
AU - Xu, Chenyang
AU - Qiu, Ling
AU - Lv, Jialong
AU - Du, Wei
PY - 2024/3/5
Y1 - 2024/3/5
N2 - To investigate the adsorption effects of aged microplastics (MPs) on Pb(II) and their co-transport properties in homogeneous (quartz sand) and heterogeneous (quartz sand with apple branches biochar) porous media, we explored the co-transport of UV-irradiated aged MPs and coexisting Pb(II) along with their interaction mechanisms. The UV aging process increased the binding sites and electronegativity of the aged MPs' surface, enhancing its adsorption capacity for Pb(II). Aged MPs significantly improved Pb(II) transport through homogeneous media, while Pb(II) hindered the transport of aged MPs by reducing electrostatic repulsion between these particles and the quartz sand. When biochar, with its loose and porous structure, was used as a porous medium, it effectively inhibited the transport capacity of both contaminants. In addition, since the aged MPs cannot penetrate the column, a portion of Pb(II) adsorbed by the aged MPs will be co-deposited with the aged MPs, hindering Pb(II) transport to a greater extent. The transport experiments were simulated and interpreted using two-point kinetic modeling and the DLVO theory. The study results elucidate disparities in the capacity of MPs and aged MPs to transport Pb(II), underscoring the potential of biochar application as an effective strategy to impede the dispersion of composite environmental pollutants.
AB - To investigate the adsorption effects of aged microplastics (MPs) on Pb(II) and their co-transport properties in homogeneous (quartz sand) and heterogeneous (quartz sand with apple branches biochar) porous media, we explored the co-transport of UV-irradiated aged MPs and coexisting Pb(II) along with their interaction mechanisms. The UV aging process increased the binding sites and electronegativity of the aged MPs' surface, enhancing its adsorption capacity for Pb(II). Aged MPs significantly improved Pb(II) transport through homogeneous media, while Pb(II) hindered the transport of aged MPs by reducing electrostatic repulsion between these particles and the quartz sand. When biochar, with its loose and porous structure, was used as a porous medium, it effectively inhibited the transport capacity of both contaminants. In addition, since the aged MPs cannot penetrate the column, a portion of Pb(II) adsorbed by the aged MPs will be co-deposited with the aged MPs, hindering Pb(II) transport to a greater extent. The transport experiments were simulated and interpreted using two-point kinetic modeling and the DLVO theory. The study results elucidate disparities in the capacity of MPs and aged MPs to transport Pb(II), underscoring the potential of biochar application as an effective strategy to impede the dispersion of composite environmental pollutants.
KW - DLVO theory
KW - Lead ions
KW - Oxygen functional group
KW - Passivation of contaminants
KW - Plastic particles
KW - Two-point adsorption kinetics
KW - UV aging
U2 - 10.1016/j.jhazmat.2023.133413
DO - 10.1016/j.jhazmat.2023.133413
M3 - Article
C2 - 38228006
AN - SCOPUS:85182593613
SN - 0304-3894
VL - 465
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 133413
ER -