Metal-organic frameworks were prepared from Fe-containing waste liquid generated during the refining process of nickel metallurgical slag as a metal source, providing a green treatment method for industrial waste liquid. The Fe-containing waste liquid was used as a raw material for the coordination synthesis of MIL-100(Fe) with 1,3,5-benzenetricarboxylic acid, whereas the ionic liquid-modified magnetic porous carbon material (Fe3O4@C/[BMIM]PF6) was prepared by loading [BMIM]PF6 into the pore size of Fe3O4@C obtained by carbonization derivatization. Since Fe3O4@C/[BMIM]PF6 exhibits strong hydrophobicity and contains unsaturated functional groups as well as hydrogen bond acceptors in structure, and a large pore size, it was used as a highly efficient adsorbent for the extraction of trace pyrethroid insecticides in the environment. Fe3O4@C/[BMIM]PF6 demonstrated excellent extraction ability, and the recoveries of the four pyrethroid insecticides in the actual samples analyzed ranged from 85.75 to 112.13%. Fe3O4@C/[BMIM]PF6 has excellent reusability and batch-to-batch reproducibility, and the relative standard deviations for the extraction recoveries of pyrethroids insecticides from the five batches were 2.14%-3.65%. The MIL-100(Fe) synthesized from high-volume preparation experiments exhibited excellent physical/chemical properties. Therefore, the green prepared Fe3O4@C/[BMIM]PF6 based on waste liquid has excellent extraction properties, and the study provides a green and low-energy treatment method for waste liquids generated by metallurgy.
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