Solvothermal Synthesis of Polyoxometalate Modified Metal-Organic Framework for Enhanced Removal of Methylene Blue from Aqueous Solution

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Removal of methylene blue (MB) from wastewater is significant to protect the environment. In this study, the facile preparation of phosphomolybdotungstic acid (H6P2Mo15W3O62)-modified metal-organic framework (MIL-96(Al)) materials for MB removal from wastewater is reported. The H6P2Mo15W3O62@MIL-96(Al) exhibited a significantly higher adsorption performance for MB than the pure MIL-96(Al). Best MB adsorption conditions are reported. The adsorption capacity of H6P2Mo15W3O62@MIL-96(Al) at 323 K was 157.73 mg g–1. The adsorption kinetics and isotherms of MB on the modified MIL-96(Al) adsorbent showed that they were basically in agreement with the pseudo-second-order kinetic model and Langmuir model, respectively. The determined thermodynamic parameters show that the adsorption process is exothermic. After five cycles, the adsorbent can still remove 68.5% of the dye, indicating its rather high recyclability.