Development of New Adsorbents MIL ‐101(Fe) Loaded Resin D201 Derived From Recycled Waste PET and Investigation of Congo Red Dye Removal

ABSTRACT Fe‐based metal organic framework was used to load macroporous resin by repurposing waste polyethylene terephthalate for congo red removal. Fe‐based metal organic framework/resin was systematically analyzed and various adsorption factors were optimized. Adsorption mechanisms were investigated based on kinetics, isotherms, thermodynamics, and various instruments. The pseudo‐second‐order ( R 2  > 0.997) and Langmuir model ( R 2  > 0.987) suggest that the adsorption process followed a homogeneous monomolecular layer and chemisorption. The thermodynamic analysis indicated that the adsorption was spontaneous and endothermic. At pH = 7, the maximum adsorption capacity was 766 mg/g. In addition, Fe‐based metal organic framework/resin exhibited a favorable adsorption selectivity towards congo red with Cl − , SO 4 , 2− and CO 3 2− . It could be conveniently separated and reused. With the help of density functional theory calculations, analyze the adsorption mechanism in depth. Adsorption mechanisms were pore filling, electrostatic interactions, π–π stacking, and hydrogen bonding. Thus, polyethylene terephthalate‐derived adsorbents could be well applied to water purification, environmental protection, and separation processes.