Novel plasmonic p-n heterojunction Ag-Ag2CO3/Bi2Sn2O7 photocatalyst for Cr(VI) reduction

Self-Assembly of Bi2Sn2O7/β-Bi2O3 S-Scheme Heterostructures for Efficient Visible-Light-Driven Photocatalytic Degradation of Tetracycline

“…Unlike β-Bi 2 O 3 and Bi 2 Sn 2 O 7 , BSO/BO-0.4 clearly contains Bi, Sn, C, and O, indicating the coexistence of β-Bi 2 O 3 and Bi 2 Sn 2 O 7 . In Figure a, two protruding peaks at 164.55 and 159.25 eV correspond to Bi 4f 5/2 and Bi 4f 7/2 , respectively, indicating that Bi exists as Bi 3+ in BSO/BO-0.4. , The peaks at 494.50 and 486.05 eV can be attributed to Sn 3d 3/2 and Sn 3d 5/2 , respectively, reflecting the presence of Sn 4+ in BSO/BO-0.4 (Figure b). , In Figure c, 288.45, 286.30, and 284.80 eV are the three peaks of C 1s spectral fitting of BSO/BO-0.4 corresponding to CO, C–C, and CC bonds, respectively. , In Figure d, 532.89, 531.83, 531.31, and 530.24 eV are the four peaks of the O 1s spectrum corresponding to O–CO, Sn–O, O–H, and Bi–O bonds, respectively . Compared with the original β-Bi 2 O 3 and Bi 2 Sn 2 O 7 , the positive and negative shifts of Bi 4f and O 1s binding energies and the negative shifts of Sn 3d binding energies of β-Bi 2 O 3 and Bi 2 Sn 2 O 7 indicate strong electronic interaction rather than physical interaction in the BSO/BO-0.4 heterojunction.…”

“… 77 , 78 The peaks at 494.50 and 486.05 eV can be attributed to Sn 3d 3/2 and Sn 3d 5/2 , respectively, reflecting the presence of Sn 4+ in BSO/BO-0.4 ( Figure 5 b). 21 , 79 In Figure 5 c, 288.45, 286.30, and 284.80 eV are the three peaks of C 1s spectral fitting of BSO/BO-0.4 corresponding to C=O, C–C, and C=C bonds, respectively. 80 , 81 In Figure 5 d, 532.89, 531.83, 531.31, and 530.24 eV are the four peaks of the O 1s spectrum corresponding to O–C=O, Sn–O, O–H, and Bi–O bonds, respectively.…”

“…77,78 The peaks at 494.50 and 486.05 eV can be attributed to Sn 3d 3/2 and Sn 3d 5/2 , respectively, reflecting the presence of Sn 4+ in BSO/BO-0.4 (Figure 5b). 21,79 In eq 3, 86,87 their corresponding E NHE values were determined to be −0.36 and 0.11 V (vs NHE), respectively.…”

Tailor‐Engineered 2D Cocatalysts: Harnessing Electron–Hole Redox Center of 2D g‐C3N4 Photocatalysts toward Solar‐to‐Chemical Conversion and Environmental Purification

“…In addition to the Schottky heterojunction, ternary hybridization with metal‐based nanoparticles such as Cu, Au, and Ag can initiate surface plasmon resonance (SPR) effect. [ 219 ] This is due to the fact that their SPR wavelength that is located in visible to near‐infrared regions is able to cover up to 90% of the solar energy distribution. [ 220 ] The SPR excitation involves the transfer of electromagnetic energy, which is highly beneficial for harvesting photons and migrating electrons in the MXene/g‐C 3 N 4 system.…”

“…[ 221 ] Additionally, SPR involves a free‐moving energetic charge in metals, which can induce near‐field electromagnetic enhancement or generate hot electrons that can be injected directly into the MXene cocatalyst for surface redox reaction. [ 219,222 ] For instance, Ding et al. employed Ag nanoparticles as the electron mediator to synthesize ternary composite of g‐C 3 N 4 /MXene@Ag, which removed up to 81.8% of the initial aniline content within 8 h. [ 171 ] The result inferred that the g‐C 3 N 4 /MXene@Ag hybrids exhibited enhanced optical absorption and low bandgap energy due to the SPR effect of Ag nanoparticles.…”