Fig. 2

FT-IR spectra of nano-catalyst layers (a) Fe3O4; (b) Fe3O4@SiO2; (c) Fe3O4@SiO2@PrEDA; (d) TTC; (e) Fe3O4@SiO2@PrEDA@TTC; (f) Fe3O4@SiO2@PrEDA@TTC@Co-Cd nano-catalyst.

FT-IR spectra of nano-catalyst layers (a) Fe3O4; (b) Fe3O4@SiO2; (c) Fe3O4@SiO2@PrEDA; (d) TTC; (e) Fe3O4@SiO2@PrEDA@TTC; (f) Fe3O4@SiO2@PrEDA@TTC@Co-Cd nano-catalyst.