Combined Effects of Octahedron NH₂-UiO-66 and Flowerlike ZnIn₂S₄ Microspheres for Photocatalytic Dye Degradation and Hydrogen Evolution under Visible Light

Abstract

The introduction of metal−organic framework materials into photocatalysts is considered to be an effective strategy for improving the transfer and separation efficiency of photogenerated electron−hole pairs. In the present study, we demonstrate the delicate construction of NH 2 -UiO-66/ZnIn 2 S 4 (NU66/ZIS) composites as bifunctional photocatalysts with the degradation efficiency of malachite green (98%) and the hydrogen evolution rate of a 10% NU66/ZIS composite reaching up to 2199 μmol h −1 g −1 . The characterization of unique ZIS/NU66 shows that it can efficiently facilitate the separation and transfer of light-induced charges and exposed rich active sites for photocatalyst redox reaction. Moreover, the results of vitro cytotoxicity assay suggest that NU66/ZIS composites are potential safety photocatalysts to the environment and human beings. Furthermore, the DFT calculation indicates that the Zr site of NU66 and In site of ZnIn 2 S 4 interface should be the main active center in NU66/ZIS heterojunctions.

Engineering a Rapid Charge Transfer Pathway for Enhanced Photocatalytic Removal Efficiency of Hexavalent Chromium over C3N4/NH2–UIO‐66 Compounds

“…As shown in Figure m, the binding energy of Zr 3d for NU locates at 182.8 and 185.2 eV, respectively. [ 37,38 ] The Zr 3d peaks of CNU5 had a slight shift toward low binding energy, while these peaks have no obvious shift for CN/NU, further proving that there is a strong interaction between Zr and CN. The N 1s spectrum of CN split into peaks at 398.6, 399.6, 400.6, and 404.3 eV, which is ascribed to sp 2 ‐hybridized N atoms in C=N, NC, and CNH and charging effects in heptazine rings, respectively.…”

A Review and Recent Developments in Full‐Spectrum Photocatalysis using ZnIn2S4‐Based Photocatalysts

“…The synthesis of MOF-derived materials requires an organic solvent environment. This excellent composite material composed of ZIS and MOFs, such as UiO-66, [28,94,95] UiO-66-(COOH) 2 , [96] NH 2 -UiO-66, [97] MIL-125(Ti), [98] and NH 2 -MIL-125(Ti), [99,100] has been prepared through the solvothermal method. For example, Peng et al prepared the novel nanostructured UiO-66@ZIS photocatalysts by coating ZIS nanosheets on UiO-66 nanospheres by a simple solvothermal method, and the samples synthesized by this method had uniform structures and improved photocatalytic activity for hydrogen production under visible light illumination, as shown in Figure 9.…”

“…[ 98 ] Zhao et al synthesized NH 2 ‐UiO‐66/ZIS hybrid photocatalysts by coupling amino‐functionalized Zr‐based MOF and ZIS through the solvothermal method. [ 97 ] The NH 2 ‐UiO‐66/ZIS composite showed excellent stability and photocatalytic activity.…”

Heterostructured MOFs photocatalysts for water splitting to produce hydrogen

“…Li et al delicately constructed a unique morphology NH 2 -UiO-66/ZnIn 2 S 4 heterostructure that NH 2 -UiO-66 nanoparticles uniformly spread over ZnIn 2 S 4 petals by ''ship-in-a-bottle" method (Fig. 7) [62], which greatly promoted large-area contact between NH 2 -UiO-66 and ZnIn 2 S 4 and was beneficial for charge transfer and separation. The optimal hydrogen evolution rate on the 10% NH 2 -UiO-66/ZnIn 2 S 4 could reach up to 2199 lmol h À1 g À1 , which was nearly twice that of ZnIn 2 S 4 .…”