Synthesis and adsorption performance of Cu-BTC microspheres for Methylene Blue Dye

The MOFs, copper-1,3,5- benzenetricarboxylate (Cu-BTC) samples were synthesized by immersing self-assembled films in solutions of copper nitrate and trimesic acid through a biomimetic mineralization method. During the synthesis, self-assembled monolayers with different end groups acted as templates, facilitating the nucleation and growth of Cu-BTC crystals. The resulting products were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) analysis. The influence of the synthesized materials on the adsorption performance of methylene blue (MB) dye was systematically investigated. The results show that the Cu-BTC compound microspheres, induced by sulfonic acid groups, have a uniform morphology and exhibit effective adsorption of MB dye. The theoretical maximum adsorption capacity of these microspheres for MB dye is 75.6 mg g(-1). The adsorption data from this process are consistent with both the pseudo-first-order kinetic model and the Langmuir isotherm model. After four adsorption-regeneration cycles, the microspheres retained a high adsorption efficiency for MB dye.