## 3 Results
### Catalytic Performance of CuFeNPs@TWM for the Elimination of CECs  
The catalytic performance of the binary material and its components were studied towards the degradation of a mixture of CECs, including ASA, NAP, and IBU, by a heterogeneous EF process. Figure 7 shows the normalized concentration decay for each contaminant during the treatment, including two steps: (i) 30 min of equilibrium/adsorption (considered as negative time, colored zone), and (ii) 30 min of the heterogeneous EF process (considered as positive time). Results indicated a low adsorption capacity using only TWM (Figure 7a) \begin{table}
\begin{tabular}{c c c c} \hline
**Catalyst** & \(\mathrm{S}_{\mathrm{BET}}\) **(m\({}^{2}\) g\({}^{-1}\))** & \(\mathrm{V}_{\mathrm{Total}}\) **(cm\({}^{3}\) g\({}^{-1}\))** & **D Pore *** (nm)** \\ \hline TWM & 489 & 0.221 & 2 \\ CuFeNPs & 6 & 0.029 & 18 \\ CuFeNPs@TWM & 295 & 0.157 & 2 \\ \hline \end{tabular}  
* Average pore diameter determined by 4V/ BET.  
\end{table} 
Table 1: BET-surface area, total volume, and average diameter pore for different samples. Figure 6: Magnetization curves obtained for: (**a**) TWM, (**b**) CuFeNPs, and (**c**) CuFeNPs@TWM. and CuFeNPs (Figure 7b), achieving a remotion of the mixture of contaminants that ranges between 2-3% and 1-2%, respectively, after the 30 min of adsorption. TWM exhibited modest adsorption capacities for all three contaminants (Table 2). The adsorption values for ASA, NAP, and IBU were 0.64 \(\pm\) 0.01, 1.64 \(\pm\) 0.05, and 1.39 \(\pm\) 0.04 mg g\({}^{-1}\), respectively. This suggests that while TWM provides some level of porosity and adsorption sites, its performance is limited due to the absence of metallic active sites or surface modifications that allow its interaction with the contaminants. CuFeNPs showed slightly enhanced adsorption for ASA (0.81 \(\pm\) 0.03 mg g\({}^{-1}\)) compared to TWM, but reduced performance for NAP (1.30 \(\pm\) 0.04 mg g\({}^{-1}\)) and for IBU (0.08 \(\pm\) 0.05 mg g\({}^{-1}\)). This may be attributed to the specific affinity of CuFeNPs for ASA, potentially due to its interaction with active sites provided by the metallic oxides, while steric or chemical incompatibility with NAP and IBU hindered their adsorption. When the current was applied, low degradation was achieved using TWM, reaching removals that range from 3 to 17% within 30 min of the electrochemical process. This removal could be attributed to the *OH radicals generated on the anode surface and the lower-oxidant H\({}_{2}\)O\({}_{2}\) electrogenerated on the cathode [76]. Likewise, for CuFeNPs, low oxidation percentages (4-14%) were achieved, which is explained by the agglomeration of the magnetic material that reduces the interaction between the Fenton and Fenton-like sites present in the catalyst with the H\({}_{2}\)O\({}_{2}\)[11]. Nevertheless, a remotion that ranges from 11 to 29% was achieved using the binary catalyst, CuFeNPs@TWM (Figure 7c), within 30 min of the equilibrium step. As can be seen in Table 2, using the binary compound, higher adsorption capacities for all contaminants were found, reaching 5.32 \(\pm\) 0.01, 14.26 \(\pm\) 0.02, and 9.39 \(\pm\) 0.02 mg g\({}^{-1}\) for ASA, NAP, and IBU, respectively. The enhancement in adsorption could be explained by a synergistic effect