## 3 Results and Discussions  
The experimental results were the following: Figure 6 depicts the obtained adsorption isotherms, while Table 4 illustrates the Langmuir parameters and recovery yields for various chloride concentrations in the copper PLS:  
The adsorption process starts once the resin comes into contact with the molybdenum carrier solution point, and this adsorbate can be eluted from the resin by one or more of the following mechanisms: (1) continued elution with the initial mobile phase (adsorbate bound mildly to the column); (2) pH gradient; or (3) ionic strength gradient [51]. The results show that the role of chloride ions is a crucial component of these findings. The first working condition evaluated was with synthetic PLS, 1 g/L Cl\({}^{-}\), for both resins. In \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Resin** & **Cl\({}^{-}\) (g/L)** & **qmax\({}_{\text{max}}\)** & **mg Mo** & **R\({}_{\text{L}}\)** & **K\({}_{\text{L}}\)**, L/mg** & **Mo** & **Zn** & **Fe** \\  & & & & & & ** Yields** & **Yields** \\ \hline DOWEX M43 & 1 & 250 & 2.4E\({}^{-03}\) & 8.2 & 83\% & 47\% & 19\% \\ DOWEX M43 & 5 & 190 & 4.4E\({}^{-03}\) & 4.5 & 63\% & 36\% & 13\% \\ DOWEX M43 & 10 & 180 & 6.2E\({}^{-03}\) & 3.2 & 60\% & 22\% & 7\% \\ Lewatit MP 62\(-\)WS & 1 & 270 & 2.0E\({}^{-03}\) & 10.0 & 90\% & 53\% & 15\% \\ Lewatit MP 62\(-\)WS & 5 & 210 & 3.1E\({}^{-03}\) & 6.5 & 70\% & 42\% & 8\% \\ Lewatit MP 62\(-\)WS & 10 & 190 & 4.7E\({}^{-03}\) & 4.2 & 63\% & 30\% & 2\% \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Langmuir adsorption parameters and recoveries. Figure 6: Adsorption isotherms for the two strongly basic resins. both cases, for DOWEX and Lewatit resins, Mo recoveries reached maximum recoveries of 83% and 90%, while the maximum loading capacities were 250 and 270 mg Mo/L of resin, respectively. This process is highly favorable towards the molybdenum ion, as shown by the low R\({}_{\text{L}}\) values from Table 4, thanks to the molybdenum's polymeric anionic forms of the type [(MoO3)x*(HMO4)y ] -y, where \"x\" and \"y\" may have values from 2 to 24, also called isopoly\(-\)acids [20]. However, since the actual working solutions contained high concentrations of chlorides, these adsorption conditions were also evaluated. These ions were incorporated by the leaching of atacamite ores (Cu2 Cl(OH)3), which enhanced the concentration of chloride in solution. In these cases, it is possible to see a decrease in the loading capacity of both DOWEX and Lewatit resins to 180 and 190 mg Mo/L of resin, respectively, and an increase in the K\({}_{\text{L}}\) parameter, which implies a loss of selectivity of the process towards molybdenum. High chloride ion concentrations, according to Equation (2), decrease the maximum adsorption capacity of molybdenum ions across the resin's surface and increase the PLS's ionic strength. In this situation, high chloride concentrations reduce the selectivity towards the Mo\({}_{7}\)O\({}_{21}\)(OH)3\({}^{3-}\) ion, lowering the total yield of the process. The leaching solutions under study possessed low levels of ionic strength. At low ionic strengths, the selectivity for the present ions is at a maximum and the adsorbates are bounded strongly. Increasing the electrolyte's ionic strength enhances competition and reduces the interaction between the resin and the species of interest, resulting in their elution during the adsorption stage [52]. Influence of the impurities: Another consideration is the concentration of contaminants in the solution, such as iron or zinc. In solution, both species are present in low amounts. However, it is vital to investigate their impact on this process. The speciations in Figure 7a,b show how these impurities behave, respectively. For the adsorption tests, iron reached a maximum recovery yield of 19% for the DOWEX resin, while zinc reached a maximum of 53% for the Lewatit resin, both at 1 g/L Cl\({}^{-}\).