A novel doped metal-organic skeleton MnDUT-52 as a sorbent for dispersive solid phase extraction of diphenyl ether herbicides in the water environment

A manganese doped metal-organic framework composite (MnDUT-52) was fabricated by a facile solvothermal method and applied as an adsorbent for dispersive solid phase extraction (DSPE) of trace diphenyl ether herbicides (Des) in water samples. The doped material exhibited large surface area (527.3 m2/g) and a higher zeta potential (43.2 mV) compared with its precursor (8.57 mV). And the quantitative parameters affecting the DSPE process (i.e., adsorbent amount, adsorption time, pH, ionic strength, desorption solvent and desorption volume) were optimized in detail. Under the optimal conditions, MnDUT-52 exhibited good reusability (6 times reuse, RSDs & LE; 5.8 %). Notably, the conjugation, hydrophobic and electrostatic interactions contributed to the good adsorption of Des by MnDUT-52. Finally, a method coupled with high-performance liquid chromatographyultraviolet (HPLC-UV) was developed. It provided wide linear range (0.2-300 ng/mL), low detection limits (0.06-0.10 ng/mL) and extraction recovery (82.4-102.5 %). The developed method was successfully applied for the fast and sensitive determination of Des in water samples.

Automated summary

A manganese doped metal-organic framework composite (MnDUT-52) was synthesized and applied for the dispersive solid phase extraction of trace diphenyl ether herbicides (Des) in water samples. The doped material showed enhanced surface area and zeta potential compared to its precursor. The optimized extraction conditions resulted in good reusability of MnDUT-52 and the developed HPLC-UV method exhibited wide linear range, low detection limits, and high extraction recovery for Des.