Table 3.

The specific adsorption and mechanisms of inorganic, organic, and emerging environmental contaminants on weathered plastic surfaces.

S.No.	MP/NP polymeric type	Adsorbed contaminant	Adsorption capacity & chemistry/kinetics	Main environmental /chemical factor (s)	Reference
1.	Natural NP at North Atlantic Gyre	Pb (II)	78.5–97% Pb adsorption on NP; Pseudo-first-order; Freundlich model	pH 7 showed maximum adsorption	Davranche et al. (2019)
2.	PE beads (dose-2–14 g L-1)	Cr(VI)	Adsorption capacity of Cr (VI)− 0.39 to 1.36 mg g-1;	pH and SDBS concentrations	Zhang et al., 2020a, Zhang et al., 2020b, Zhang et al., 2020c, Zhang et al., 2020a, Zhang et al., 2020b
3.	PE, PP, PVC and PS MPs	Cd (II)	–Adsorption capacity on PVC MPs (151.4 mgKg-1) > PS (134.1 mg Kg-1) > PP (123.6 mg Kg-1) > PE (113.5 mg Kg-1); Freundlich isotherm non-linear model better suited than Langmuir model	pH, humic acid, polymeric types and ionic strength of solution	Guo et al. (2020)
4.	PE, PP and PS MPs	9-Nitroanthracene (9-NAnt)	9-NAnt adsorption was maximized on PE MPs (734 μg g−1); adsorption mechanism better described with linear isothermal model	Hydrophobic and electrostatic processes	J. Zhang et al. (2020)
5.	PE MPs and PP MPs	Pharmaceuticals (three Nonsteroidal anti-inflammatory drugs i.e., ibuprofen, naproxen, diclofenac)	Highest adsorption capacity noted for Diclofenac	Highest sorption noted at lower pH (2)	Elizalde-Velázquez et al. (2020)
6.	PS NPs and caboxylated (PS-COOH) NPs	Fluoroquinolones	Langmuir model was the best fit model for adsorption isotherms	pH (sorption of fluoroquinolones on PS NPs were higher at pH 5 while pH 6 facilitated their sorption PS-COOH NPs)	H. Zhang et al. (2020)
7.	PS NPs	PAHs (conc. 10–5 µg L−1 to 1 µg L−1)	log Kf varied from 5.7 to 6.0, adsorption isotherms-nonlinear with π–π interactions; distribution coefficients at lower end of isotherm- 109 L kg− 1	Pre-extraction with C18 polydimethyl-siloxane reduced the sorption of PAHs	Liu et al. (2016)