Preparation Of Metal Organic Skeleton Material NH ₂ - MIL - 101 And Study On Adsorption Properties Of Tetracycline

In China, antibiotic pollution of the environment has led to some social problems, and tetracycline as one of the used antibiotics for people has caused a serious threat to human health and the living environment, so the antibiotic residues in water environment treatment has become a hot spot. Metal-Organic Frameworks which is a new class of porous materials has high specific surface area, pore size can be adjusted, functional modification and many other characteristics. It has been widely applied to many fields. Synthesis of high specific surface area of MOFs has been a focus of the researches, in addition, functional modification of MOFs can give raw material number of new features to extend its range of applications. Therefore, the synthesis and function of high specific surface area of MOFs modification has very important significance.Chosen tetracycline as samples of antibiotics and NH2- MIL-101 as adsorbent to carry out the adsorption experiments. The results showed that NH2-MIL-101 has a good adsorption capacity to tetracycline. Finally, metal-organic framework NH2-MIL-101 was synthesized by hydrothermal method and used as adsorbent to remove tetracycline from aqueous system in this paper. The impact of DMF solvent dosage, the metal center and reaction time on the adsorption property of NH2-MIL-101 were analyzed. The results showed that NH2-MIL-101 had the better adsorption property for tetracycline in the preparation conditions using Cr as the metal center, DMF solvent volume 50 mL, reaction temperature 150 ℃, reaction time 72 h. and the tetracycline adsorption reached 48.80%. The synthesized sample is indeed NH2-MIL-101 (Cr) by XRD, SEM, IR. TG and so on.According to the kinetic and thermodynamic studies, we found the adsorption kinetics and thermodynamic data of tetracycline were adapted to the pseudo-second-order model and the Freundlich model, and the calculation results of thermodynamic parameters △H and △G comes to the conelusion that the adsorption process was endothermic process and dominated by chemical adsorption.