Insitu growth of IRMOF-3 combined with ionic liquids to prepare solid-phase microextraction fibers

• IRMOF-3@ILs/PDMS SPME fiber was prepared and characterized.
• The ILs can efficiently prevent the substantial crack of IRMOF-3 caused by moisture.
• PDMS film can protect the material to achieve much better extraction efficiency.
• The coating was evaluated by analyzing PAHs in water sample.

A superior solid-phase microextraction (SPME) fiber-coating material, IRMOF-3@ILs/PDMS, was prepared by the in situ growth of IRMOF-3 onto stainless-steel wires and protection with ionic liquids (ILs) and polydimethylsiloxane (PDMS). The ILs can efficiently prevent the substantial cracking of IRMOF-3 caused by moisture, and a thin PDMS film can protect the IRMOF-3@ILs material to achieve a much better extraction efficiency as well as excellent resistance to high temperature and high humidity. This IRMOF-3@ILs/PDMS coating possessed a porous structure, a rough surface and an increased lifespan (by at least 100 times) compared with that of IRMOF-3. The coating was evaluated by analyzing four polycyclic aromatic hydrocarbons (PAHs) in water, and good precision (<7.7%), low detection limits (12.0–15.4 ng L−1), and wide linearity (50–20,000 ng L−1) were achieved under the optimized conditions. The fiber was successfully applied to the sensitive analysis of PAHs in rainwater by coupling it with gas chromatography–mass spectrometry (GC–MS).

Figure optionsDownload as PowerPoint slide