UV-stable paper coated with APTES-modified P25 TiO2 nanoparticles

Abstract

In order to inhibit the photocatalytic degradation of organic material supports induced by small titania (TiO2) nanoparticles, highly photocatalytically active, commercially available P25-TiO2 nanoparticles were first modified with a thin layer of (3-aminopropyl)triethoxysilane 20 (APTES). These APTES-modified P25 TiO2 nanoparticles were then deposited and fixed onto the surface of paper samples via a simple, dip-coating process in water at room temperature.The resultant APTES-modified P25 TiO2 nanoparticle-coated paper samples exhibit much greater stability to UV-illumination than uncoated blank reference paper and very little, or no, photo-degradation in terms of brightness and whiteness, respectively, of the P25-TiO2-25 nanoparticle-treated paper is observed. There are many other potential applications for this Green Chemistry approach to protect cellulosic fibres from UV-bleaching in sunlight and to maintain their whiteness and brightness.

Photocoupled Bioanode: A New Approach for Improved Microbial Fuel Cell Performance

“…[32] Theh igh-resolution and fitted spectra of the O1sr egion( Figure S1 c) for the TNT photoanodes how two peaks that correspond to TiÀO( BE = 529.8 eV) and OÀHb onds (BE = 530.9 eV). [33,34] Theh igh-resolution XPS spectra of the C1sa nd N1sr egionsa re shown in Figure S1 d and e, respectively;t hese peaks can be assigned to surfaceadsorbed C( C ÀCa tB E = 284.5 eV,C ÀOa tB E = 286.0 eV and C=Oa tBE= 288.5 eV) [35] and Na toms. [36] Thep hoto-electrochemical response of the TNT photoanode is shown in Figure 4.…”

Higher UV-shielding ability and lower photocatalytic activity of TiO2@SiO2/APTES and its excellent performance in enhancing the photostability of poly(p-phenylene sulfide)

“…1c and d) show that adsorbed water and hydroxyl groups existed on the surface of all of the samples, revealed by the presence of the broad peak at around 3420 cm À1 and the sharp peak at around 1630 cm À1 . 14,24 An intense absorption peak is also found at 800-400 cm À1 , which was assigned to the stretching vibration of the Ti-O-Ti bond. For the TiO 2 @SiO 2 particles, new peaks at 1229, 1157, 1071 and 941 cm À1 are also observed.…”

“…According to the literature, the characteristic peak at 1071 cm À1 is caused by the stretching vibration of the Si-O-Si bond. 24 Furthermore, the absorption peaks at 1157 cm À1 and 941 cm À1 arise from Si-OH groups and the Ti-O-Si bond, respectively. 10,13 The appearance of these peaks clearly shows that the condensation reaction of Si(OH) 4 and the hydrolyzed production of TEOS and TiO 2 surface hydroxyl groups takes place to form Ti-O-Si bonds.…”

Microstructure of SiO2/TiO2 hybrid electrospun nanofibers and their application in dye degradation

“…Hence, the activity of such photocatalysts is mainly determined by their adsorption ability and the concentration of electrons and holes on their surface. Generally, higher specific surface area can endow photocatalysts with higher photocatalytic efficiency [9][10][11][12][13]. Sometimes, to obtain high surface area and adsorption capacity, more defective sites can be formed on the surface and in the bulk of photocatalysts.…”