Direct Z-scheme hierarchical heterostructures of oxygen-doped g-C₃N₄/In₂S₃ with efficient photocatalytic Cr(vi) reduction activity

Abstract

Direct Z-scheme hierarchical heterostructures of O-doped g-C3N4/In2S3 were simply prepared, exhibiting efficient photocatalytic Cr(vi) reduction under visible light illumination.

Hierarchical S-Scheme Heterostructure of CdIn2S4@UiO-66-NH2 toward Synchronously Boosting Photocatalytic Removal of Cr(VI) and Tetracycline

“…The two corresponding peaks of the CIS@U66N-30 sample negatively shift to 184.7 and 182.4 eV, respectively (Figure d). As displayed in Figure e, the high-resolution C 1s spectra of both the pristine U66N and CIS@U66N-30 samples could be resolved into three peaks, and both of them show the C 1s peak at 284.8 eV, being assigned to sp 2 C–C bonds of graphitic carbon . For pristine U66N, the other two C 1s peaks at 288.7 and 286.8 eV are identified to O–CO and aryl carbon on benzene ring, respectively, while the two relevant peaks in the CIS@U66N-30 sample are located at lower values (288.3 and 286.1 eV) (Figure e).…”

“…As displayed in Figure 3e, the high-resolution C 1s spectra of both the pristine U66N and CIS@U66N-30 samples could be resolved into three peaks, and both of them show the C 1s peak at 284.8 eV, being assigned to sp 2 C−C bonds of graphitic carbon. 4 For pristine U66N, the other two C 1s peaks at 288.7 and 286.8 eV are identified to O−C�O and aryl carbon on benzene ring, respectively, 44 while the two relevant peaks in the CIS@U66N-30 sample are located at lower values (288.3 and 286.1 eV) (Figure 3e). The O 1s XPS spectrum of pristine U66N (Figure 3f) could be well deconvoluted into three peaks at 532.7, 531.3, and 529.6 eV, which are attributed to surface adsorbed −OH group, C�O group of the organic linker and Zr−O in U66N, respectively.…”

“…The flat band potentials of CIS and U66N are computed to be −0.50 and 0.25 V (vs RHE), respectively, derived from the intersection point of the tangent of M–S curves and the x -axis. It is widely recognized that the CB or lowest unoccupied molecular orbital (LUMO) potential ( E C or E L ) in the n-type semiconductor is close to their flat-band potentials, , and thus, the E C of CIS and the E L of U66N are assessed as −0.5 and −0.25 V (vs RHE), respectively. Combined with the band gaps ( E g ) determined from UV–vis DRS (Figure S6b) and the formula E g = E VB (VB potential) – E CB or E g = E H (HOMO potential) – E L , the E VB of CIS and E H of U66N are identified as 1.40 and 2.50 V (vs RHE), respectively.…”

“…37,52 After incorporating U66N, the absorption wavelength regions of resulting CIS@U66N samples display evident blue shift compared to pure CIS, likely due to the strong interfacial interaction between CIS and U66N. 4 The band gap energies of bare CIS and pristine U66N are assessed to be 1.90 and 2.75 eV, respectively, based on the Kubelka−Munk transformed spectra of CIS and U66N presented in Figure S6b.…”

Simultaneously enhanced photocatalytic cleanup of Cr(vi) and tetracycline via a ZnIn2S4 nanoflake-decorated 24-faceted concave MIL-88B(Fe) polyhedron S-scheme system

“…3e), which are identified as In 3d 3/2 and In 3d 5/2 with the reference values for In 3+ , respectively. 38–40 The matching peaks in the M88B@ZIS-10 sample are located at higher values (452.7 and 445.2 eV). In Fig.…”