The Preparation of Robust Gully-like Surface of Stainless Steel Fiber-Bonded TFPA-TTA-COF with Nano Pores for Solid-Phase Microextraction of Phenolic Compounds in Water.

In this paper, a novel robust TFPA-TTA-COF coating with nano pores was grafted to the gully-like surface of stainless steel fibers (GS-SSF). The GS-SSF were prepared using a two-step electrochemical etching method, and the covalent organic framework (COF) TFPA-TTA-COF coating was chemically bonded to the gully-like surface via in situ growth. The prepared metal fibers were applied as the headspace solid-phase microextraction (HS-SPME) fibers and combined with gas chromatography (GC) to develop a detection method for phenolic compounds (PCs) in water. The developed method gave the limits of detection (S/N = 3) from 0.07 µg·L to 0.52 µg·L with enrichment factors from 243 to 2405. The relative standard deviations for inter-day study (n = 5) and fiber-to-fiber were from 3.94% to 8.89% and 2.17% to 8.05%, respectively. The prepared fiber could stand at least 180 cycles without remarkable loss of extraction efficiency. The developed method was successfully employed for the determination of trace PCs in environmental water with recoveries from 84.76% to 124.84%.