Antibiotics 1 Energy dispersive spectroscopy 1 Fe-N-SiO2/TiO2 1 Fe-N-sio2/tio2 1 Fe/SiO2 Field emission microscopes 1 Modified composites 1 Morphology 1 Nanocomposite systems 1 Nanocomposites 1 Nonbiodegradable Antibiotics 1 Nonbiodegradable antibiotic 1 Optical emission spectroscopy 1 Optical properties 1 Oxytetracycline 1 Photocatalytic Degradation 1 Photocatalytic activity 1 Photocatalytic degradation 1 Photoluminescence spectroscopy 1 Reusability 1 Scanning electron microscopy 1 SiO2 nanoparticles 1 SiO2-TiO2 1 Silica 1 Silicon 1 Specific removal rate 1 TiO2 nanoparticles 1 Titanium dioxide 1 Visible light 1