Synthesis and photocatalytic properties of core–shell TiO2@ZnIn2S4 photocatalyst

Electrodeposited ZnIn2S4 onto TiO2 thin films for semiconductor-sensitized photocatalytic and photoelectrochemical applications

“…Moreover, it can be seen a small shift in onset potential from -0.5 to -0.1V vs.Ag/AgCl, suggesting a shift in Fermi level as a result of the coupling TiO 2 and ZnIn 2 S 4 . This result gives a slight improvement in photoelectrochemical performance as compared with other reported data available in literature[33,49]. This suggests that the performance of the ZnIn 2 S 4 /TiO 2 thin films in terms of photoelectrochemical cell depending on the synthesis process.Both photoanodes (TiO 2 and junction ZnIn 2 S 4 / TiO 2 ) were illuminated intermittently at a given potential (+ 0.5V vs.Ag/AgCl) for several cycles, to appreciate the reproducibility of their photoresponses as well as the stability of the device toward oxidation.…”

“…As explained previously in the experimental section, methylene blue substrate was chosen as a polluent model to evaluate the photocatalytic efficiency of the prepared [33], which explained that the unique core/shell nanostructure of a composite semiconductor photocatalyst plays a key role resulting in a large increase in the photocatalytic activity for methylene blue degradation. In fact, The intimate contact between TiO 2 and ZnIn 2 S 4 favors the formation of junctions between the two components [36], and the higher activity of the ZnIn 2 S 4 /TiO 2 composite can be attributed to electron transfer between two conduction bands [37,38] .…”

“…This activity is demonstrated by the considerable decrease in the absorbance, which is related to the decrease of concentration of methylene blue in the solution. In the presence of only TiO 2 thin films, (curve not presented here), the UV-visible absorption spectra remained constant, which demonstrated that TiO 2 has no photocatalytic activity under visible light irradiation[33]. As illustrated inFig.5bthe absorbance at 660 nm for methylene blue in the presence of ZnIn 2 S 4 /TiO 2 thin films decreased as increasing the irradiation time, accompanied by the intensity decrease, the maximum absorption wavelength of methylene blue monomer[26].…”

Ag2CO3 sensitized TiO2 nanoparticles prepared in ionic liquid medium: A new Ag2CO3/TiO2/RTIL heterostructure with highly efficient photocatalytic activity

“…Several modifications were employed for improving the properties of TiO 2 photocatalyst. Obviously, coupling of TiO 2 with narrow band-gap semiconductors will be an efficient approach to realize its visible light response and enhance the great separation of charge carriers [11][12][13][14]. As a visible light semiconductor photocatalyst, sensitive silver carbonate (Ag 2 CO 3 ) with a universal high efficient degradation ability for hazardous contaminants was reported recently [15][16][17].…”

Synthesis of colloid silica coated with ceria nano-particles with the assistance of PVP

“…Combining different materials to achieve synergies or new characteristic is always a hot area in material science [13][14][15][16]. In recent years, the interest of combining the advantages of both SiO 2 and CeO 2 attracts much attention on preparation of core-shell composite particles [17][18][19].…”