Magnetic Porous Carbon Adsorbents Derived from Iron‐Containing Metal–Organic Frameworks for Efficient Cr(VI) Removal

The escalating threat of Cr(VI) contamination in water due to rapid industrialization necessitates the development of effective and economical removal technologies. Herein, the synthesis of porous carbon adsorbents (MECs) is reported through a one‐step carbonization process involving ethylenediaminetetraacetic acid dipotassium salt dihydrate (EDTA‐2K·2H 2 O) and an iron‐containing metal–organic framework, MIL‐100(Fe). MECs boast a high specific surface area (up to 1206.0 m 2 g −1 ) and magnetic properties, rendering them suitable for the adsorption and removal of Cr(VI) ions from aqueous solutions. The effects of various parameters, including pH, adsorbent dosage, temperature, contact time, and ion concentrations, on Cr(VI) removal are systematically investigated. The results indicate that MECs not only demonstrate high adsorption capacity, selectivity, stability, and reversibility but also achieve a maximum adsorption capacity of 296.0 mg·g −1 at 328.15 K within just 40 min. Furthermore, MECC, which was synthesized by directly carbonizing components MIL‐100(Fe) and EDTA‐2K·2H 2 O at a mass ratio of 1:8, can be easily recovered via magnetic recycling. Mechanistic studies have elucidated that Cr(VI) adsorption on MECs involves both physical and chemical interactions. This research provides valuable insights into the design of porous magnetic carbon materials for Cr(VI) removal applications.