Abstract
Zirconium based metal organic frameworks (Zr-MOFs) have become popular in engineering studies due to their high mechanical stability, thermostability and chemical stability. In our work, by using a theoretical kinetic adsorption isotherm, we can exert MOFs to an acid dye adsorption process, experimentally exploring the adsorption of MOFs, their external behavior and internal mechanism. The results indicate their spontaneous and endothermic nature, and the maximum adsorption capacity of this material for acid orange 7 (AO7) could be up to 358 mg·g−1 at 318 K, estimated by the Langmuir isotherm model. This is ascribed to the presence of an open active metal site that significantly intensified the adsorption, by majorly increasing the interaction strength with the adsorbates. Additionally, the enhanced π delocalization and suitable pore size of UiO-66 gave rise to the highest host–guest interaction, which further improves both the adsorption capacity and separation selectivity at low concentrations. Furthermore, the stability of UiO-66 was actually verified for the first time, through comparing the structure of the samples before and after adsorption mainly by Powder X-ray diffraction and thermal gravimetric analysis.
Highlights
Water is one of the most important natural resources for human beings to live and develop; it is particularity indispensable and irreplaceable
Since stability is the basic factor for MOFs to be applied to gas storage, catalysis, water treatment, Since stability is the basic factor for MOFs to be applied to gas storage, catalysis, water treatment, drug delivery, fluorescence sensing and so on, the samples of UiO-66 before and after adsorption drug delivery, fluorescence sensing and so on, the samples of UiO-66 before and after adsorption were collected and contrastively analyzed using Powder X-ray diffraction (PXRD)
The adsorption kinetic experiments were executed at 298 K, in which a 5 mg sample of powdered UiO-66 and 50 mL of acid orange 7 (AO7) aqueous solution were placed in a 100 mL beaker
Summary
Water is one of the most important natural resources for human beings to live and develop; it is particularity indispensable and irreplaceable. As a class of advanced crystalline porous materials, MOFs have been considered to be the most promising candidates to replace the conventional porous materials in pollutant removal due to their diverse structure and compositions, high surface area, tunable pore size, numerous active metal sites and so on [29,30,31,32]. The study on MOFs for wastewater treatment has mainly been focused on their water stability, regeneration, and the effects of MOFs’ structure, such as pore size, functional group and active metal sites, on the adsorption performance [25,33,34]. UiO-66, and replaces the water molecule to form a relatively stable complex compound
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