A robust and green CoAl-LDH@MoS₂/glass TFME platform for highly sensitive determination of bisphenol a in aqueous...

Thin-film microextraction has emerged as a powerful solvent-free sample preparation technique, featuring a high surface area-to-volume ratio sorbent phase that enhances extraction efficiency and sensitivity compared to traditional approaches. ultraviolet detection; AGREEprep.

A novel thin-film microextraction platform based on cobalt-aluminum layered double hydroxide@ molybdenum disulfide grown on glass was developed for the efficient extraction of bisphenol A from aqueous matrices. The hierarchical heterostructure, prepared via a two-step hydrothermal method, combines molybdenum disulfide nanoflowers for π-π stacking with cobalt-aluminum layered double hydroxide nanopetals for hydrogen bonding and anion exchange, resulting in a high surface area (312 m² g^-1) and multimodal adsorption.

The glass-supported film offers excellent stability (>100 reuse cycles) and thermal robustness (>620 °C decomposition). Optimized conditions include 8 min extraction at 200 rpm and desorption with 200 μL methanol. The method provides linearity from 0.01 to 100 μg L^-1, limit of detection 3.1 ng L^-1, limit of quantification 9.6 ng L^-1, enrichment factor 170, and relative standard deviation < 3.2% (repeatability, n = 3) across low (near limit of quantification), middle, and high calibration levels (inter-day RSD <8.6%). Real-sample relative recoveries ranged from 98% to 120% in thermal paper, mineral water, and tap water, with negligible matrix effects. The method scores 0.68 on AGREEprep, outperforming dispersive liquid-liquid microextraction (0.42), solid-phase microextraction (0.68), and hollow-fiber liquid-phase microextraction (0.51). This reusable, low-solvent platform is a sustainable option for endocrine disruptor monitoring, with potential for similar phenolic compounds.