“…Quantitatively, the BET surface area and total pore volume of all Au x /TiO 2 were summarized in Table 1 . The Au 1.0 /TiO 2 exhibited the BET surface area slightly higher than that of other Au x /TiO 2 NPs as well as the parental TiO 2 , probably due to its well dispersion on the surface of TiO 2 26 , 35 , which can enhance a high adsorption capacity. Figure 5 Representative N 2 adsorption/desorption isotherms of commercial TiO 2 and Au x /TiO 2 NPs synthesized by photodeposition at different gold loadings in the range of 0.1–1.0 wt%.…”
Section: Resultsmentioning
confidence: 90%
“…The separation of deposited Au NPs from the used Au/TiO 2 photocatalyst can be carried out by the selective dissolution using the chemical extractant. Besides, the repetitively used Au/TiO 2 NPs are possibly used as the photocatalysts for other photocatalytic application such as H 2 production 26,[53][54][55][56] , but more characterizations and photocatalytic activity tests are required.…”
Section: Discussionmentioning
confidence: 99%
“…The UPS mode of this analysis allowed to estimate the value of Fermi edge energy ( E f ) and cutoff edge energy ( E c ), which can be used to compute the photocatalytic work function (Φ) as well as the valence band energy ( E v ) and conduction band energy ( E c ) according to Eqs. ( 3 )–( 5 ) 24 – 26 . where Φ is the work function of photocatalysts, hv is the excitation source which equals to 21.2 eV for helium (He), E f is the Fermi edge energy, E c is the cutoff edge energy, E V is the valence band energy, E C is the conduction band energy, E a is the electron affinity of TiO 2 NPs (3.9 eV 27 ) and E g is the band gap energy obtained from UV–Vis analysis and Tauc’s plot.…”
Section: Methodsmentioning
confidence: 99%
“…The UPS mode of this analysis allowed to estimate the value of Fermi edge energy (E f ) and cutoff edge energy (E c ), which can be used to compute the photocatalytic work function (Φ) as well as the valence band energy (E v ) and conduction band energy (E c ) according to Eqs. (3)-( 5) [24][25][26] .…”
A series of Aux/TiO2 nanoparticles (NPs) with different gold loadings (x = 0.1–1.0 wt%) was synthesized by the photodeposition and then employed as photocatalysts to recover precious component from the industrial gold-cyanide plating wastewater. Effects of Au loading, catalyst dosage and types of hole scavenger on the photocatalytic gold recovery were investigated under ultraviolet–visible (UV–Vis) light irradiation at room temperature. It was found that different Au loadings tuned the light absorption capacity of the synthesized photocatalysts and enhanced the photocatalytic activity in comparison with the bare TiO2 NPs. The addition of CH3OH, C2H5OH, C3H8O, and Na2S2O3 as a hole scavenger significantly promoted the photocatalytic activity of the gold recovery, while the H2O2 did not. Among different hole scavengers employed in this work, the CH3OH exhibited the highest capability to promote the photocatalytic gold recovery. In summary, the Au0.5/TiO2 NPs exhibited the best photocatalytic activity to completely recover gold ions within 30 min at the catalyst dosage of 0.5 g/L, light intensity of 3.20 mW/cm2 in the presence of 20 vol% CH3OH as hole scavenger. The photocatalytic activity slightly decreased after the 5th cycle of recovery process, indicating its high reusability.
“…Quantitatively, the BET surface area and total pore volume of all Au x /TiO 2 were summarized in Table 1 . The Au 1.0 /TiO 2 exhibited the BET surface area slightly higher than that of other Au x /TiO 2 NPs as well as the parental TiO 2 , probably due to its well dispersion on the surface of TiO 2 26 , 35 , which can enhance a high adsorption capacity. Figure 5 Representative N 2 adsorption/desorption isotherms of commercial TiO 2 and Au x /TiO 2 NPs synthesized by photodeposition at different gold loadings in the range of 0.1–1.0 wt%.…”
Section: Resultsmentioning
confidence: 90%
“…The separation of deposited Au NPs from the used Au/TiO 2 photocatalyst can be carried out by the selective dissolution using the chemical extractant. Besides, the repetitively used Au/TiO 2 NPs are possibly used as the photocatalysts for other photocatalytic application such as H 2 production 26,[53][54][55][56] , but more characterizations and photocatalytic activity tests are required.…”
Section: Discussionmentioning
confidence: 99%
“…The UPS mode of this analysis allowed to estimate the value of Fermi edge energy ( E f ) and cutoff edge energy ( E c ), which can be used to compute the photocatalytic work function (Φ) as well as the valence band energy ( E v ) and conduction band energy ( E c ) according to Eqs. ( 3 )–( 5 ) 24 – 26 . where Φ is the work function of photocatalysts, hv is the excitation source which equals to 21.2 eV for helium (He), E f is the Fermi edge energy, E c is the cutoff edge energy, E V is the valence band energy, E C is the conduction band energy, E a is the electron affinity of TiO 2 NPs (3.9 eV 27 ) and E g is the band gap energy obtained from UV–Vis analysis and Tauc’s plot.…”
Section: Methodsmentioning
confidence: 99%
“…The UPS mode of this analysis allowed to estimate the value of Fermi edge energy (E f ) and cutoff edge energy (E c ), which can be used to compute the photocatalytic work function (Φ) as well as the valence band energy (E v ) and conduction band energy (E c ) according to Eqs. (3)-( 5) [24][25][26] .…”
A series of Aux/TiO2 nanoparticles (NPs) with different gold loadings (x = 0.1–1.0 wt%) was synthesized by the photodeposition and then employed as photocatalysts to recover precious component from the industrial gold-cyanide plating wastewater. Effects of Au loading, catalyst dosage and types of hole scavenger on the photocatalytic gold recovery were investigated under ultraviolet–visible (UV–Vis) light irradiation at room temperature. It was found that different Au loadings tuned the light absorption capacity of the synthesized photocatalysts and enhanced the photocatalytic activity in comparison with the bare TiO2 NPs. The addition of CH3OH, C2H5OH, C3H8O, and Na2S2O3 as a hole scavenger significantly promoted the photocatalytic activity of the gold recovery, while the H2O2 did not. Among different hole scavengers employed in this work, the CH3OH exhibited the highest capability to promote the photocatalytic gold recovery. In summary, the Au0.5/TiO2 NPs exhibited the best photocatalytic activity to completely recover gold ions within 30 min at the catalyst dosage of 0.5 g/L, light intensity of 3.20 mW/cm2 in the presence of 20 vol% CH3OH as hole scavenger. The photocatalytic activity slightly decreased after the 5th cycle of recovery process, indicating its high reusability.
“…[37][38][39][40][41] As we all know, precious metals not only greatly absorb visible light but also transfer hot electrons into the neighboring TiO 2 matrix, then induce photocatalytic activity under visible light, for example, Au NPs. [42][43][44][45] In addition, according to the reports, Au NPs can contribute to the reduction of electron-hole recombination by charge separation, which further increases the photocatalytic activity under the condition of simulated solar light. [46][47][48][49] For example, Qureshi et al constructed multiple interfaces and dual junctions of Au/g-C 3 N 4 Schottky-junction and TiN/g-C 3 N 4 ohmicjunction, 50 and these procedures contributed to promote the separation of charge carriers and improve the performance of photocatalytic hydrogen production.…”
As a promising technology for energy storage and conversion, solar-driven reduction of nitrogen to ammonia has been attracted a lot of attention. Thus, the ternary nanocomposites of PdO/Au-TiO2 and Au/PdO-TiO2...
Hydrogen gas as a clean energy source, it is a promising alternative to fossil fuels. Therefore, people are actively seeking effective ways to produce hydrogen to cope with the imminent global energy shortage. However, the current production of hydrogen relies on the catalytic reforming of fossil fuels, inducing inevitable environmental pollution. Alternatively, photocatalysis for produce hydrogen gas from reforming alcohols is a promising approach. Especially, other value‐added hydrocarbon products, such as acetone, acetaldehyde, acetic acid, etc., can also be produced during the photoreforming process of alcohols. Meanwhile, reducing the production of COx, making it an environmentally friendly conversion process. Outstandingly, TiO2 and its derivative are excellent photocatalysts. Among them, TiO2 cocatalyzed with noble metal can easily increase the H2 evolution rate to the mmol g−1 h−1 scale. Among the light alcohols isopropyl alcohol has fewer side reactions, methanol and ethanol have higher reaction rate, but they require to reduce the by‐product COx. In this review, the recent developments in this field are summarized; various studies regarding H2 evolution rate, illumination condition, quantum efficiency, etc., are compared; and the development prospects of this field, with the hope of sparking widespread research interest, are proposed.
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