## 5 Conclusions
Additionally, evaluating the composites under real-world conditions, such as in wastewater treatment applications, will help assess their long-term stability and efficiency in handling complex pollutant mixtures. Further studies on the recyclability and reusability of the composites are also crucial for improving their practical applicability and ensuring their sustainability in industrial processes. The following supporting information can be downloaded at [[https://www.mdpi.com/article/10.3390/app15041679/s1](https://www.mdpi.com/article/10.3390/app15041679/s1)]([https://www.mdpi.com/article/10.3390/app15041679/s1](https://www.mdpi.com/article/10.3390/app15041679/s1)), Materials: Synthesis procedures of complexes (**1**)-**(**5**). Figure S1. SEM images of the composite films enriched with titanium(IV)-oxo complexes (yellow rings mark TOCs' grains); Figure S2. SEM images of the composite films enriched with ruthenium(III) complexes (yellow rings mark Ru(III) complexes' grains); Table S1. SEM EDX quantity data. All values are given in mass per cent (%); Figure S3. SEM EDX spectra of pure PMMA and composites containing titanium(IV)-oxo complexes (**2**) and (**3**); Figure S4. SEM EDX spectra of composites containing ruthenium(III) complexes (**4**) and (**5**); Table S2. Ti L2,3 edge (two first features correspond to L3 and two latter features correspond to L2 edges). Pre-edge features were visible at ca. 456.4 457.3 eV for powdered samples and experiments performed in TEY mode; Table S3. Percentage reduction of dyes by composites PMMA + ((**1**)-(**5**)); Figure S5. Changes in the concentrations of the methylene blue (MB) solution as a function of time for composite materials PMMA + (**1**)-(**5**) 2-20 wt.% irradiated with UV light; Table S4. Decolorization percentages of MB solutions for the studied reactions relative to the composites irradiated by UV light; Figure S6. Changes in the concentrations of the crystal violet (CV) solution as a function of time for composite materials PMMA + (**1**)-(**5**) 2-20 wt.% irradiated with UV light; Table S5. Decolorization percentages of CV solutions for the studied reactions relative to the composites irradiated by UV light. Figure S7. Changes in the concentrations of the methylene blue (MB) solution as a function of time for composite materials PMMA + (**1**)-(**5**) 2-20 wt.% irradiated with Vis light; Table S6. Decolorization percentages of MB solutions for the studied reactions relative to the composites irradiated by VIS light. Figure S8. EPR spectra of the PMMA composites with (**2**) and of powdered TOC. Conditions: room temperature; microwave frequencies: 9.324675 GHz (PMMA+ (**2**) 2 wt.%), 9.324486 GHz (PMMA+ (**2**) 5 wt.%), 9.323992 GHz (PMMA+ (**2**) 10 wt.%), 9.323746 GHz (PMMA+ (**2**) 20 wt.%), and 9.317209 GHz ((**2**)); modulation amplitude: 1 mT; sweep: 20 mT; sweep time: 4 min; time constant: 0.1 s; receiver gain: 2 \(\times\) 10\({}^{5}\) (composites) and 0.5 \(\times\) 10\({}^{5}\) ((**2**)). Table S7. EPR data for the studied PMMA composites and powdered complexes. Figure S9. EPR spectra of the PMMA composites with (**3**) and of powdered TOC. Conditions: room temperature; microwave frequencies: 9.324157 GHz (PMMA+ (3) 2 wt.%), 9.324280 GHz (PMMA+ (**3**) 5 wt.%), 9.323349 GHz (PMMA+ (**3**) 10 wt.%), 9.322974 GHz (PMMA+ (**3**) 20 wt.%), and 9.324018 GHz ((**3**)); modulation amplitude: 1 mT; sweep: 20 mT; sweep time: 8 min (composites) and 4 min ((**3**)); time constant: 0.1 s; receiver gain: 4 \(\times\) 10\({}^{5}\) (composites) and 5 \(\times\) 10\({}^{5}\) ((**3**)). Figure S10. EPR spectra of the PMMA composites with (**4**) and of powdered complex.