Dyes Adsorption on Cu3(BTC)2 Metal-­Organic Framework

S. Loera­Serna, J. Garcia-Ortiz, E. Ortiz
Universidad Autonoma Metropolitana,
Mexico

Keywords: metal-organic frameworks, dyes, adsorption

Summary:

The present work suggests an alternative to the solution of environmental problems caused by the textile industry effluents, which contain natural dyes and non-biodegradable synthetic mostly. This solution is the use of porous metal-organic frameworks (MOF), which possess adsorptive and catalytic properties favoring retention organic molecules as some dyes. The study was conducted using a copper MOF, Cu3(BTC)2 with cubic structure and easy synthesis. The dyes were studied: basic fuchsin, violet crystal and black eriochrome T. The methodology is based on only adsorb dye molecules without damage within the pore structure of the MOF. To carry out this process we developed two methods of work; the first was during synthesis and the second after synthesis, adding both a known concentration of the dye and mentioned. The obtained solids were analyzed quantitatively and qualitatively by techniques characterization: X-ray diffraction (XRD), scanning microscopy (SEM), thermal analysis gravimetric (TGA) to determine the morphological and structural characteristics of the material and infrared spectroscopy ultraviolet-visible (UV-Vis), to determine the concentration of dye adsorbed organic metal network. The results indicate that the percent retention of basic fuchsin in the post-synthesis process was 99.42%, while in the process during the synthesis, when the dye is incorporated in the organic part the percentage was 91.47% and when incorporated the metal part was 96.54%. Crystal violet dye to the post-synthesis process managed to retain 96.30%, in the second approach; the percentages were 97.61 and 98.12% for the organic part and the metal, respectively. The black eriochrome T dye was retained in 86.93, 95.92 and 94.44% for post-synthesis, organic part and metal part, respectively.