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Fabrication of molecularly imprinted resin via controlled polymerization applied in the enrichment of bisphenol A for plastic products
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Researchers developed molecularly imprinted polymers with high selectivity for bisphenol A using surface-initiated atom transfer radical polymerization, achieving a maximum adsorption capacity of 387.2 μmol/g and 93.4–99.7% recovery from real plastic samples — demonstrating a reliable method for detecting and enriching this endocrine-disrupting chemical.
The addition of bisphenol A has been frequently used in industrial manufacturing because it imparts plastic products with characteristics such as transparency, durability, and excellent impact resistance. However, its widespread use raises concerns about potential leakage into the surrounding environment, which poses a significant risk to human health. In this study, molecularly imprinted polymers with specific recognition of bisphenol A were synthesized through surface-initiated atom transfer radical polymerization using poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) as the substrate, bisphenol A as the template molecule, 4-vinylpyridine as the monomer, and ethylene glycol dimethacrylate as the cross-linker. The bisphenol A adsorption capacity was experimentally investigated, and the kinetic analysis of the molecularly imprinted polymers produced an adsorption equilibrium time of 25 min, which is consistent with the pseudo-second-order kinetic model. The results of the static adsorption experiments exhibited consistency with the Langmuir adsorption model, revealing a maximum adsorption capacity of 387.2 μmol/g. The analysis of molecularly imprinted polymers-enriched actual samples using high-performance liquid chromatography demonstrated excellent selectivity for bisphenol A, with a linear range showing 93.4%-99.7% recovery and 1.1%-6.4% relative standard deviation, demonstrating its high potential for practical bisphenol A detection and enrichment applications.
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Microplastics as potential bisphenol carriers: role of adsorbents, adsorbates, and environmental factors
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Laboratory experiments showed that four common microplastic types — polystyrene, polypropylene, polyamide, and PVC — all readily adsorb bisphenols (BPA, BPB, BPF, BPS), with polyamide showing the highest capacity. Adsorption was strongly influenced by polymer surface chemistry, bisphenol hydrophobicity, temperature, and salinity. Because bisphenols are potent endocrine disruptors, microplastics acting as their environmental carriers could amplify human and wildlife exposure through contaminated seafood and drinking water.
Adsorption mechanisms of five bisphenol analogues on PVC microplastics
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The adsorption of five bisphenol analogues (BPA, BPS, BPF, BPB, BPAF) onto PVC microplastics was studied, finding maximum adsorption efficiencies of 0.15–0.24 mg/g and identifying a three-stage kinetic process involving surface transport and intraparticle diffusion. The study reveals that PVC microplastics can adsorb plasticizer bisphenol compounds at significant levels, creating a potential feedback loop of chemical re-release in aquatic environments.
Efficient Water Pollutants Targeting: Novel Materials with Molecular Imprints for Textile Industry Use
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Researchers developed molecularly imprinted cyclodextrin-based polymers and found they could rapidly and selectively adsorb crystal violet dye from textile wastewater within one minute, achieving adsorption capacities up to 1,076 mg/g with stable performance across five regeneration cycles, outperforming non-imprinted counterparts.
Is bisphenol A sorbed onto microplastics less bioavailable than freely dissolved bisphenol A? Implications for the gut health in a murine model
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Using an in vivo rat model, researchers tested whether bisphenol A adsorbed onto microplastics is less bioavailable in the gastrointestinal tract than freely dissolved BPA, finding that plastic-bound BPA showed altered absorption kinetics and different hormonal effects than dissolved BPA.
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