Metal-organic frameworks derived magnetic porous carbon for magnetic solid phase extraction of benzoylurea insecticides from tea sample by Box-Behnken statistical design.

•A novel Fe2O3@C was synthesized by carbonizing MOF-235 under Ar atmosphere.•The magnetic Fe2O3 particles were evenly embedded in porous carbon matrix.•The Fe2O3@C was used to extract benzoylurea insecticides from tea drink samples.•This work studied the removal effect of three washing on residues from tea leaf.•This method showed satisfactory recovery, wide linear range and low LODs.