Remarkable adsorption performance for trace lead (II) by Fe/Zn 2D metal organic nanosheets modified with triethylamine

Fe/Zn metal organic nanosheet (B-FeZn) was prepared using 1,4-benzenedicarboxylic acid and triethylamine. B-FeZn showed a remarkable trace-level lead (II) (Pb2+) adsorption performance. The removal rates reached ≥ 98% within 60 min. After five adsorption/desorption cycles, the adsorption capacity of B-FeZn for Pb2+ was decreased by 17.10%. Langmuir isothermal model and pseudo-second-order kinetic model were applied to define the purification process via the adsorption with high fitting degrees. The maximum adsorption capacity reached 215.90 mg·g−1. The prepared B-FeZn material exhibits a remarkable performance, with a fast adsorption rate and a prominent regeneration performance, in the adsorption for trace Pb2+, providing a novel Pb2+ adsorbent with a bright future in the Pb2+ removal in industrial production. Graphical abstract: [Figure not available: see fulltext.].