Study on MoS₂/Fe‐MIL‐88NH₂ Transition metal dichalcogenide/Metal‐organic framework as a novel composite for highly adsorption of methylene blue dye from aqueous solutions

Abstract

The present study proposes a unique MoS 2 /Fe-MIL-88NH 2 composite as an adsorbent for methylene blue (MB) from aqueous solutions for the first time. Different physicochemical techniques are utilized to characterize (metalorganic framework [MOF]/transition metal dichalcogenide [TMD]), including elemental analysis, Fourier transform infrared (FT-IR), field emission scanning electron microscopy (FE-SEM), zeta potential (ζ) measurement, and Brunauer-Emmett-Teller (BET) theory. The effects of different process factors on MB dye adsorption by composite are examined, including initial dye concentration, adsorbent loading, solution pH, temperature, and dye mixture. Various process parameters encompassing the initial dye concentration, adsorbent loading, solution pH, temperature, and mixture of dyes are investigated, and the equilibrium adsorption capacity towards MB is found up to 370 mg g À1 (when pH = 4.0, contact time is 90 min, and the adsorbent dose is 0.0068 mmol g À1 ). Experimental results reveal that the adsorption process is highly dependent on adsorbent dosage, initial MB concentration, and aqueous solution temperature. Equilibrium data are fitted onto Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models expressing the MB adsorption phenomena. Moreover, the isotherm data fit Freundlich mathematical models with maximum dye adsorption of 370 mg g À1 . Sorption kinetics follows a pseudo-second-order model.