Hybrid organic-inorganic porous material for efficient extraction of phenolic pollutants

In this study, a low-cost octaphenylcyclotetrasiloxane (OPS) was used as the structural building block to prepare an organic-inorganic hybrid porous material (OPS-OIHM) via a facile Scholl coupling reaction. The material exhibits high specific surface area, and possesses excellent stability. OPS-OIHM demonstrates strong affinity for phenolic compounds through the synergistic effects of π-π stacking, hydrophobic interactions, and hydrogen bonding. A method involving OPS-OIHM-based solid-phase extraction, followed by HPLC detection, was established to analyze chlorophenols (including 2-chlorophenol, bisphenol A, 2,6-dichlorophenol, 2,4-dichlorophenol, and p‑tert-butylphenol) in various samples such as water, juice, and milk. The method achieved detection limits of 0.02-0.08 ng mL⁻¹ in water, 0.10-0.22 ng mL⁻¹ in juice, and 0.28-0.60 ng mL⁻¹ in milk. Linear responses were observed across the following concentration ranges: 0.06-100 ng mL⁻¹, 0.30-100 ng mL⁻¹, and 0.84-500 ng mL⁻¹. The recoveries of spiked water, juice and milk were 80.0%-120.3%, 82.0%-116.0% and 80.8%-113.6%, respectively. The relative standard deviations were less than 7.43%. This work provides an efficient and reliable approach for the analysis of trace phenolic pollutants in complex samples, showing promising potential for applications in environmental monitoring and food safety.