Enhanced broad spectrum (vis-NIR) responsive photocatalytic performance of Ag2O/rectorite nanoarchitectures

Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO2

“…The CB and VB potentials were +0.21 and +2.94 eV of SCK, +0.25 and +3.11 eV of CTSCK, respectively (Figure 11), which were obtained from the results of UV–vis DRS and VB XPS analysis. Although the generated e − from Cu‐TiO 2 (+0.25 eV) in CTSCK is not strong enough to directly reduce O 2 molecule to O 2 •‐ (−0.33 eV vs. NHE), the e − on Cu‐TiO 2 surface could interact with O 2 to form O 2 •− radicals due to the multielectron oxygen reduction found on the Cu(II) grafted TiO 2 photocatalyst 41 . The e − from Cu‐TiO 2 could also transfer from CB to SCK through percolation mechanism 42,43 .…”

Mineral-Supported Photocatalysts: A Review of Materials, Mechanisms and Environmental Applications

“…Rectorite could capture electrons to generate O 2− radicals with the adsorbed oxygen molecules and thereby prohibit electron-hole recombination and Ag 3 PO 4 photo-corrosion. As a photosensitizer with adjustive wide spectrum responsive ability, Ag 2 O was incorporated into rectorite clay to obtain Ag 2 O/rectorite nanocomposites with high efficiency under broader spectrum light, especially near-infrared light irradiation [174]. The Nyquist curve comparison of different Ag 2 O/rectorite samples indicated that the existence of rectorite clay could provide more active sites to detach photoinduced electron-hole pairs and effectively improve photocatalyst stability.…”

Recent Developments in Heterogeneous Photocatalysts with Near-Infrared Response

“…As a result of an anti-Stokes process, the excitation of up-conversion materials by low-energy NIR light leads to the emission of high-energy luminescence including UV or visible light in an asymmetric way [82]. The basic working principles of photo-energy upconversion can be categorized into three paths (Figure 6): (1) excited state absorption (ESA in Figure 6a), where an ion is excited from the ground state to a high-energy excited state by sequential two-or multi-photon absorption [83]; (2) the energy transfer up-conversion path (ETU), where one excited ion receives the energy transferred by proximate excited ions to reach the excited states with high levels (Figure 6b) [84];…”

“…As a result of an anti-Stokes process, the excitation of up-conversion materials by low-energy NIR light leads to the emission of high-energy luminescence including UV or visible light in an asymmetric way [82]. The basic working principles of photo-energy upconversion can be categorized into three paths (Figure 6): (1) excited state absorption (ESA in Figure 6a), where an ion is excited from the ground state to a highenergy excited state by sequential two-or multi-photon absorption [83]; (2) the energy transfer up-conversion path (ETU), where one excited ion receives the energy transferred by proximate excited ions to reach the excited states with high levels (Figure 6b) [84]; (3) photon avalanche (PA), which can be regarded as the combination of the above two upconversion luminescence paths to result in a population of the high-energy states (e.g., E3 in Figure 6c) rapidly in an avalanche-like mode. When the ion at the excited state on E3 falls down to the ground states, it emits high-level photons to realize up-conversion luminescence [24].…”