## 4 Conclusions  
In this manuscript, preliminary data on the removal of IMT and CRZ from an aqueous solution by sorption processes with TiO\({}_{2}\) suspension, TiO\({}_{2}\)-GF, and immobilized TiO\({}_{2}\)/CNT-GF were presented. The influence of contact time, solution pH, initial pharmaceutical concentration, ionic strength, sorbent dosage, and ambient temperature was studied to determine the affinity of IMT and CRZ for the photocatalyst used. Statistical analysis confirmed that the complexity of the sorption process is strongly influenced by the various parameters mentioned above. Since most of the pharmaceuticals present in the environment are expected to be in ionized form, the experiments were carried out at different pH values in the range of 5-9, to show what interactions may occur due to the physicochemical properties of sorbent and sorbate during the sorption process. The \(K_{d}\) values obtained from the linear isotherm, the best model to describe the sorption processes for both pharmaceuticals (\(R^{2}>0.99\)), increased with increasing alkalinity of the aqueous medium. When  
Figure 5: Determination of [PERSON]’s correlation coefficients between sorption influencing parameters.  
inorganic salt was added to the solution, an opposite behavior of the drugs was observed. The sorption affinity of CRZ decreased with increasing concentration of Na-cations, while IMT was slightly more sorbed on all three catalyst types. Increasing the mass of TiO\({}_{2}\) also increased the active sites on the catalysts, resulting in higher sorption affinity of the two drugs. Thermodynamic parameters indicated spontaneity of CRZ and IMT sorption on all catalyst forms used. Higher ambient temperature had positive effect on the sorption of pharmaceuticals on both types of immobilized TiO\({}_{2}\) and on the suspension for CRZ, while IMT added in suspension showed an exothermic response. The pseudo-second-order model best described the kinetics of the sorption process with \(R^{2}\) values close to one. Despite the fact that the suspended form of TiO\({}_{2}\) had a higher sorption capacity, when the efficiency of the removal process, sorption or photocatalysis was considered together with the operating costs, including the preparation of the sorbent, it can be concluded that the suspension is not cost-effective in real water treatment applications at higher levels, considering the time-consuming and expensive separation without the possibility of reuse.  
CRZ and IMT showed a similar and relatively good tendency to sorb to the TiO\({}_{2}\) photocatalyst, which can be considered for future research as a potential sorbent for pharmaceuticals removal from various types of water matrices. If a compound has a good affinity for the sorption catalyst, the sorption process should be considered as an economically and environmentally efficient method for the removal of contaminants, rather than a process that requires higher energy consumption.  
Conceptualization, D.M.P. and K.T.C.; methodology, D.M.P. and K.T.C.; validation, K.T.C. and D.M.P.; formal analysis, D.M.P., K.T.C., K.D., M.P., I.F., I.J. and V.S.; investigation, D.M.P., K.T.C., K.D., M.P. and I.F.; data curation, D.M.P. and K.T.C.; writing--original draft preparation, K.T.C.; writing--review and editing, K.T.C., D.M.P. and I.B.; supervision, D.M.P. and K.T.C. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The data presented in this study are available upon request from the corresponding author.  
The authors declare no conflict of interest.