Enhancement of Structural Properties and Adsorption Performance of ZIF-67 via Synthesis in Methanol at Ambient Temperature for Rhodamine B Removal
Keywords:
ZIF-67, Metal-Organic Frameworks (MOFs), Methanol, Ambient Temperature Synthesis, Rhodamine B Adsorption, Endothermic ProcessAbstract
In this study, a cobalt-based metal-organic framework (ZIF-67) was synthesized using methanol as a solvent through an ambient temperature synthesis method. The choice of methanol as the solvent played a crucial role in controlling the morphology, particle size, and uniformity of their distribution. The presence of methanol in the synthesis process enhanced nucleation and crystal growth, resulting in a reduction in particle size and improved dispersion. The structural and morphological characteristics of the synthesized ZIF-67 were investigated using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). The results showed that the use of methanol significantly affected the reduction in particle size and the improvement of particle uniformity. The adsorption performance of ZIF-67 was evaluated for the removal of rhodamine B, achieving an adsorption capacity of 11.31 mg/g and a removal efficiency of 90.56% under optimal conditions. These experiments were conducted at a pH of 7, with an adsorbent dose of 0.02 g, an initial rhodamine B concentration of 5 mg/L, and a contact time of 180 minutes. The adsorption process analysis showed that increasing temperature led to an increase in the removal efficiency of rhodamine B, indicating the endothermic nature of the adsorption process. This suggests that higher temperatures improve adsorption efficiency, and the process inherently requires the absorption of energy from the environment.
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