Enhanced visible-light-driven photocatalytic activity of bi-phase titanium dioxide @ covalent organic framework Z-scheme system for photocatalytic removal of Cr (Ⅵ)

Visible‐Light‐Responsive Polyoxometalate@Metal‐Organic Frameworks Involving Ir Metalloligands for Highly Selective Photocatalytic Oxidation of Sulfides to Sulfoxide

“…Besides, we investigated the carrier separation and electron migration properties of Ir−SiW by transient photocurrent and electrochemical impedance. This can be seen in Figure 2c, the photocurrent generated by Ir−SiW is much higher than that of H 2 L and SiW 12 under light irradiation, indicating that the photogenerated electron‐hole pair separation efficiency of Ir−SiW is higher [54,55] . Similarly, the Nyquist plot reveals that the semicircle size of Ir−SiW is smaller compared to that of H 2 L and SiW 12 (Figure 2d), which is indicative of a lower charge transfer resistance and a faster interfacial charge transfer process, [56] which agrees well with the results of the photocurrent response.…”

“…This can be seen in Figure 2c, the photocurrent generated by IrÀ SiW is much higher than that of H 2 L and SiW 12 under light irradiation, indicating that the photogenerated electron-hole pair separation efficiency of IrÀ SiW is higher. [54,55] Similarly, the Nyquist plot reveals that the semicircle size of IrÀ SiW is smaller compared to that of H 2 L and SiW 12 (Figure 2d), which is indicative of a lower charge transfer resistance and a faster interfacial charge transfer process, [56] which agrees well with the results of the photocurrent response. To summarize, the combination of H 2 L and SiW 12 in IrÀ SiW improves the separation efficiency of carrier and reduces the interfacial resistance making electron transfer easy.…”

Solvent-Free Synthesis of Cu/In Dual-Single-Atom-Doped TiO2 for Photocatalytic Reduction of Cr (VI) with High Efficiency

“…The PL emission spectrum is measured by excitation at a wavelength of 300 nm. 48 It can be used to determine the recombination rate of photogenerated electrons and holes. As shown in Figure 6b, the PL intensity of the Cu/In-TiO 2 is much weaker than that of TiO 2 and Cu-TiO 2 , and Cu-TiO 2 is weaker than bare TiO 2 .…”

“…This result is consistent with previous reports. 48,53 Figure 9 shows a schematic diagram of the proposed photocatalytic mechanism of Cr (VI) reduction with catalyst Cu/In-TiO 2 under simulated sunlight irradiation. When the Cu/In-TiO 2 is irradiated by simulated sunlight, it is excited and subsequently produces photoinduced electrons and holes on the oxidation of H 2 O to produce O 2 and protons (H + ).…”

Highly effective ruthenium-doped mesoporous Ti1−xRuxO2−y crystals for photocatalytic tetracycline degradation

“…Among them, TiO 2 with high photocatalytic activity has been intensively investigated. 34,35 Great efforts have been made to increase photon utilization, and optimize the charge dynamics of TiO 2 -based catalysts through doping, morphological control, and the construction of heterojunctions. Wu et al realized the broad photon absorption of TiO 2 through nitrogen doping, leading to a 94.8% degradation efficiency of TC after 120 min.…”