Interface engineering of Ti-MOFs: Adsorption of anionic, cationic and neutral dyes in wastewater

Adsorption technology is a promising method of removing pollutants in fluid phase. Ti-MOFs are widely used as adsorbents. But Ti-MOF with different morphologies for dyes adsorption has not been reported, so far. In this work, three kinds of morphologies Ti-MOFs, truncated octahedron, frustum, cake-like struc-ture were prepared to adsorbing different dyes, including methylene blue (MB), methyl orange (MO) and indigo (IB), and it found that has the best removal efficiency for the cationic MB dye. It is found the adsorption process is exothermically and follows pseudo-second-order/Freundlich isotherm model. Ad-sorption is facet-dependent, absorbed energy has the order of {100} > {111} > {001}, truncated octahe-dron Ti-MOFs is with the large exposed {111}/{100} surface, exhibit the best adsorption and three kinds of Ti-MOFs have the adsorption order of truncated octahedron > frustum structure > cake-like struc-ture. Actual wastewater treatment was processed. This work provided a highly efficiently adsorbent for industrial dyes wastewater remediation.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

Adsorption technology is a promising method for removing pollutants in fluids, and Ti-MOFs are widely used as efficient adsorbents. However, the use of Ti-MOFs with different morphologies for dye removal has not been reported. In this study, three kinds of Ti-MOFs with different morphologies were prepared and tested for adsorbing different dyes. It was found that the truncated octahedron Ti-MOFs showed the best removal efficiency for the cationic dye methylene blue. The adsorption process was exothermic and followed a pseudo-second-order/Freundlich isotherm model. The results also showed that the adsorption performance was dependent on the facet orientation, with truncated octahedron Ti-MOFs exhibiting the highest adsorption capacity among the three morphologies. This research provides a highly efficient adsorbent for industrial dye wastewater remediation.