“…~ 3.2 eV; ~388 nm) [68] . Therefore, a direct model for interband transition would seem more appropriate in this system [see also references [39] , [52] ] – indeed, although unusual, anatase having direct gap transition has already been reported in the literature [69] , [70] . Fig.…”
Section: Resultsmentioning
confidence: 92%
“…However, the vast majority of the literature deals with photocatalytic water treatment [33] , [34] , [35] , [36] , as only few papers, in recent literature based on graphene-TiO 2 composites, are about the photocatalytic degradation of air pollutants. Those latter works deal or with the abatement of nitrogen oxide(s) [37] , or with the removal of organic compounds – like acetone [38] , or benzene [39] . Still, a single comprehensive study dealing with the gas–solid phase photocatalytic removal of different kinds of hazardous organic compounds ( i.e.…”
“…~ 3.2 eV; ~388 nm) [68] . Therefore, a direct model for interband transition would seem more appropriate in this system [see also references [39] , [52] ] – indeed, although unusual, anatase having direct gap transition has already been reported in the literature [69] , [70] . Fig.…”
Section: Resultsmentioning
confidence: 92%
“…However, the vast majority of the literature deals with photocatalytic water treatment [33] , [34] , [35] , [36] , as only few papers, in recent literature based on graphene-TiO 2 composites, are about the photocatalytic degradation of air pollutants. Those latter works deal or with the abatement of nitrogen oxide(s) [37] , or with the removal of organic compounds – like acetone [38] , or benzene [39] . Still, a single comprehensive study dealing with the gas–solid phase photocatalytic removal of different kinds of hazardous organic compounds ( i.e.…”
“…A direct transition would seem more appropriate for this set of specimens. However, although unusual, anatase having a direct gap transition has already been reported in the literature [36,37]. Nevertheless, one limitation of the Tauc method is that it assumes the analysed specimen to be composed of one single Eg, this being not our case.…”
<p>Hydrogen, as energy carrier, is a
zero-emission fuel. Being green and clean, it is considered to play an
important role in energy and environmental issues. Photocatalytic water
splitting is a process used to generate hydrogen from the dissociation of
water. Titanium dioxide is still the archetype material for photocatalytic
water splitting. However, because of the fast recombination of the
photo-generated exciton, the yield of the reaction is typically low. In this
work, we have modified the surface of titanium dioxide with copper and
copper/graphene to sensitise it to visible light, and to increase the spatial
charge carrier separation, thus extending the quantum yield of H<sub>2</sub> production
from methanol/water mixtures. Results showed that, in the analysed system,
exists an optimum amount of copper plus graphene (<i>i.e.</i> 0.5 mol% copper plus 0.5 wt% graphene) to grant a two-fold
increase in the photocatalytic hydrogen generation compared to that of bare
titania. That system proved itself to be complex and dynamic. This was attributed to the increased spatial charge carrier separation exploited by graphene (under 365 and 405 nm irradiation), and to the continuous reduction of Cu(II) to Cu(I) due to IFCT that has proven to be an excellent visible-light sensitiser in the copper/graphene-titania system.</p><p>Hybrid titania-copper-graphene materials could therefore be exploited in
the field of light-to-energy applications.</p>
“…The carbon based materials are efficient for adsorption of the pollutants or other contaminated chemicals in the water; it is also enhances the active surface of the catalyst and act as effective photocatalyst (Sakthivel and Kisch, 2003). Several researchers are reported that quantum efficiency of TiO2 may be increased using carbonaceous materials in the visible spectrum as associated to pure TiO2, it is because of chemical linkage between them (Silva et al, 2020). TiO2 was coated on the carbon foam act as effective treatment for degradation of dye present in the wastewater under the solar spectrum.…”
TiO2 based photocatalyst has potential material for disinfection of harmful pathogens as well as removal of organic compounds. The formation of reactive oxygen species is a key part for overall process but aggregation and band gap constraint explore a new dimension to use of support for propounding its physicochemical properties. Therefore, the modification of TiO2 using various support alters photocatalytic action and promising ways of the mechanism based on nature of substrates and environments. In addition, the immobilization of nano dimension photocatalyst may reduce overall cost of operation and recovery of photocatalytic materials. In this perspective, extensive range of support materials as carbonaceous matters, clay, polymers, metal oxides have been studied by various researchers; that have been compiled in this review article. The properties of support were the key features for the assortment of appropriate supports for increase its efficiency as photocatalyst. In brief, overall TiO2 based photocatalyst supported on various substrates pave the ways toward new strategies for water disinfection.
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