## 3 Results and Discussion
### Adsorption Performances  
H\({}_{2}\) adsorption-desorption isotherms at 5 \({}^{\circ}\)C and 30 \({}^{\circ}\)C for the MF-S1-W2 batch are shown in Figure 8.  
The isotherms clearly exhibit a varying uptake of hydrogen (H\({}_{2}\)), with the most significant and effective results observed for the isotherm at 5 \({}^{\circ}\)C. Each curve follows a continuous pattern, showing a gradual increase in H\({}_{2}\) uptake with increasing pressure. It is noteworthy that upon comparing the sorption and desorption trends, no significant hysteresis effects can be identified. Figure 8: H\({}_{2}\) uptake isotherms (5 \({}^{\circ}\)C and 30 \({}^{\circ}\)C) for the MF-S1-W2 sample. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Element** & **Weight \%** & **Atomic \%** \\ \hline C & 33.7 & 44.3 \\ O & 52.4 & 51.8 \\ Fe & 13.9 & 3.9 \\ Total & 100 & 100 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: The atomic percentages of MF-S1-W2 composition. Figure 7: SEM image (**a**) and EDX spectrum (**b**) of MF-S1-W2 sample. Looking closely at the H\({}_{2}\) adsorption-desorption isotherms, we notice a remarkable uptake of H\({}_{2}\) by the MF-S1-W2 sample, reaching a maximum of 0.25 wt.% under conditions of 5 \({}^{\circ}\)C and 40 bar. This level of uptake is notably consistent with the performance of numerous MOF materials in terms of H\({}_{2}\) adsorption at similar temperature-pressure conditions [48; 49; 50]. Moreover, the calculation of heats of hydrogen adsorption, derived from the fully reversible hydrogen isotherms obtained at 5 \({}^{\circ}\)C and 30 \({}^{\circ}\)C, was executed by using the Clausius-Clapeyron equation [51]. The value determined for the heat of adsorption was 5 kJ/mol. In addition to examining the hydrogen adsorption properties, our research delved into understanding how carbon dioxide interacts with the MIL(100)(Fe) MF-S1-W2 batch. Notably, a comparison between the adsorption/desorption isotherms of CO\({}_{2}\) at two distinct temperatures, 5 \({}^{\circ}\)C and 30 \({}^{\circ}\)C, is presented in Figure 9.  
Similarly to the hydrogen absorption results, there is a consistent upward trend in CO\({}_{2}\) absorption with increasing pressure levels. Notably, the isotherm recorded at the lowest temperature stands out for its significantly higher absorption rates across various pressure ranges. The most favorable outcomes were notably achieved under specific conditions of 5 \({}^{\circ}\)C and 10 bar, resulting in a carbon dioxide absorption rate of about 32.6 wt.%. Contrastingly, the absorption capacity experienced a considerable drop of about 27% when the temperature condition was increased to 30 \({}^{\circ}\)C, with a maximum absorption of 23.9 wt.% found at higher pressures. This result is comparable to the CO\({}_{2}\) uptake on MIL-100(Fe) achieved by the authors of [52], who measured a CO\({}_{2}\) adsorption capacity of approximately 25 wt.% at 25 \({}^{\circ}\)C and 10 bar. Furthermore, we employed the Clausius-Clapeyron equation [51] to calculate the heats of CO\({}_{2}\) adsorption from the fully reversible CO\({}_{2}\) isotherms obtained at 5 \({}^{\circ}\)C and 30 \({}^{\circ}\)C, obtaining heats of adsorption equal to 20 kJ/mol. MOF materials characterized by their hydrophilic metal sites have garnered attention for their promising applications in water-related fields. Specifically, these materials show significant potential in crucial areas like water harvesting, desalination, and adsorption heat pumps (AHPs). The achievement of high water vapor adsorption capabilities by these solid sorbents could play a relevant role in enhancing their utility and effectiveness in this field. Figure 10 shows the water vapor sorption isobars (8.3 mbar, 12.3 mbar, 17 mbar, 20 mbar) for the MF-S1-W2 sample in the 30-70 \({}^{\circ}\)C temperature range. Figure 9: CO\({}_{2}\) uptake isotherms (5 \({}^{\circ}\)C and 30 \({}^{\circ}\)C) for MF-S1-W2 sample. The water uptake curves exhibit a distinctive S-shaped adsorption trend, which becomes more pronounced with increasing partial pressure.