## 3 Fe-MOF Synthesis
### Microwave-Assisted Synthesis
\begin{table}
\begin{tabular}{c c c c c c} \hline
**MOF** & **Organic Ligand** & **Metal Source** & **Solvent** & **Procedure** & **Reference** \\ \hline ML-53(Fe)-NH\({}_{2}\) & 2-aminoterphthal acid (NH\({}_{2}\)-BDC) & FeCl\({}_{3}\)-6H\({}_{2}\)O & HCl & A reaction mixture of NH\({}_{2}\)-BDC, HCl and FeCl\({}_{3}\)-6H\({}_{2}\)O (molar ratio 1:1:1) was loaded in a 10 mL glass & 1:1:1) was loaded in a 10 mL glass & 1:1 min in an ultrasound bath and placed in a microwave. Then, it was heated to the reaction temperature as fast as possible with different power impulses. Then, it was cooled down to 65 \({}^{\circ}\)C by an airflow. The resulting product was washed. & \\ \hline Fe-MOF & BDC & FeCl\({}_{3}\).6H\({}_{2}\)O & DMF & FeCl\({}_{3}\).6H\({}_{2}\)O and BDC (molar ratio 1:1) were dissolved in 50 mL DMF. & \\ Fe-MOF & BDC & FeCl\({}_{3}\).6H\({}_{2}\)O & DMF & 10 mL NaOH solution was added. Then it was placed in an oven at 100 \({}^{\circ}\)C for 10 h. After the reactor cooled, the resulting solid was recovered, cleaned and dried in a vacuum oven at 60 \({}^{\circ}\)C. & \\ \hline Fe-MOF & H\({}_{2}\)BDC & FeSO\({}_{4}\).7H\({}_{2}\)O & DMF & A total of 20 mL DMF with H\({}_{2}\)BDC (2.6734 g) was stirred for 30 min, while FeSO\({}_{4}\).7H\({}_{2}\)O (3.2133 g) was dissolved in 20 mL of deionized water. Then both dissolutions were mixed and stirred for 30 min, and then transferred to the reactor (150 \({}^{\circ}\)C for 12 h). Finally, the product was filtered, washed and dried (70 \({}^{\circ}\)C for 5 h). & \\ \hline Zr/Fe-MOFs/GO & BDC & FeSO\({}_{4}\).7H\({}_{2}\)O and zirconium acetate & DMF & A hydrothermal process was used to synthesize the compound. Two solutions, BDC and DMF (ratio: 3.3215 g:10 mL) and FeSO\({}_{4}\).7H\({}_{2}\)O and zirconium acetate. (ratio: 2.8133 g:2.6 mL) were mixed and transferred to a reactor (120 \({}^{\circ}\)C for 10 h). Then, the reaction mixture was filtered, washed and dried (80 \({}^{\circ}\)C for 12 h). & \\ \hline Mg/Fe-MOF & BDC & Fe(NO\({}_{3}\))\({}_{3}\)-9H\({}_{2}\)O and MgCl\({}_{2}\)-6H\({}_{2}\)O & DMF and acetonitrile & 40 mL of acetonitrile was added and the mixture was placed into a Teflon flask in an oven (150 \({}^{\circ}\)C for 12 h). After cooling, the precipitate was collected, washed and dried at 150 \({}^{\circ}\)C under a vacuum. & \\ \hline Cu/Fe-MOF & BDC & Fe(NO\({}_{3}\))\({}_{3}\).9H\({}_{2}\)O and Cu(NO\({}_{3}\))\({}_{2}\).3H\({}_{2}\)O & DMF and acetonitrile & 40 mL of acetonitrile was added and the mixture was placed into a Teflon flask in an oven (150 \({}^{\circ}\)C for 12 h). After cooling, the precipitate was collected, washed and dried at 150 \({}^{\circ}\)C under a vacuum. & \\ \hline \end{tabular}
\end{table} 
Table 4: _Cont._Among the modified MOFs, the Fe-MOF synthesized by [PERSON] et al. [105] was the Fe\({}_{3}\)O\({}_{4}\)@MIL-100(Fe). This MOF, unlike all the others found by this synthesis method, used Fe\({}_{3}\)O\({}_{4}\) nanoparticles, which were previously synthesized by the solvothermal method, as the magnetic core of the Fe-MOF. By making this change, a material with a high adsorption capacity of ciprofloxacin (273.65 mg/g) and with high selectivity was obtained. As for the unmodified Fe-MOFs, they stand out because they do not use any solvent, they only use the iron salt with a certain ligand providing a green approach to the synthesis. This is important because no toxic solvents are used, such as DMF, and less waste or by-products are generated. To improve the properties that Fe-MOF can exhibit, acombination with other synthesis methods has been proposed. Common examples that have been found include microwave-assisted hydrothermal synthesis, which allows the advantages offered by microwave and hydrothermal methods [106] and the combination of microwave and solvothermal methods [107]. These combinations of methods are not considered in Table 5.