Activities of Metal-Organic Frameworks for the Adsorption of Clofibric Acid from Water

Pharmaceutical and personal care products (PCPPS) are a newly emerging pollutant and are not well managed in traditional water treatment processes. In addition, metal-organic frameworks (MOFs) are being studied for application to various fields such as catalysts, energy storage, adsorption, etc. due to their structural characteristics such as porosity, high specific surface area, some metal organic structures are undergoing basic research to be applied to the treatment of environmental pollutants in water and atmospheric environment. Recently distinguished types of metal-organic frameworks (MOFs) have dynamic applications for clofibric acid (PPCPs pharmaceutical and personal care product) removal through the adsorption process from the aqueous phase. In this study, we investigated the adsorption and removal characteristics of clofibric acid belonging to medicinal materials and personal care products by synthesizing metal organic structure. The metal organic structure used in the study is MIL-101(Cr) and MIL-101-OH, modified by attaching the hydroxyl functional groups (-OH) to MIL-101(Cr). The metal organic structure was prepared by hydrothermal reaction and its structural characteristics were investigated by FTIR, XRD and specific surface area analysis. Batch adsorption experiments were carried out and the results were determined by kinetic analysis and optimum isothermal adsorption. Adsorption reaction rate analysis showed that both adsorption of clofibric acid to MIL-101 (Cr) and MIL-101-OH was followed by pseudo-second-order kinetic equation. All adsorption experiments were found to be more consistent with Langmuir isotherms. Therefore, the maximum adsorption amount of MIL-101-OH with -OH radicals was higher in the pollutant, which is somewhat different from the result of structural characterization.