(A) Fourier transforms of k³-weighted EXAFS oscillations obtained at the Cu K-edge of the various samples. (B) Solid EPR spectra of various samples. (C) Cu 2p_3/2 XPS spectra for d-TiCuAl-SiO₂ Ns, d-Cu-SiO₂, Ns d-CuAl-SiO₂ Ns and Ti 2p XPS spectra for d-TiCuAl-SiO₂ Ns. The inset shows the LMM X-ray induced Auger parameter for the sample. (D) CV of various electrodes prepared from the corresponding samples. (E) Fenton catalytic degradation of BPA in various suspensions at initial pH 7. (F) The utilization efficiency of H₂O₂ in the d-Cu-SiO₂ Ns, d-CuAl-SiO₂ Ns and d-TiCuAl-SiO₂ Ns suspensions. The inset shows the corresponding decomposition of H₂O₂. Adapted with permission from ref. [27], Copyright©2016, The Royal Society of Chemistry.