Z-scheme AgBr@Ag/CoAl layered double hydroxide heterojunction for superior photocatalytic Cr(VI) reduction under visible light
Source abstract
Abstract
Abstract Construction of the Z-scheme heterojunction photocatalytic system is a promising strategy for improving the catalytic activity of photocatalysts. Herein, a novel Z-scheme AgBr@Ag/CoAl layered double hydroxide (LDH) photocatalyst was successfully prepared. The AgBr@Ag/LDH composites displayed superior performance for Cr(VI) reduction under visible light. The optimal composite with a 10 wt% silver content showed the highest photocatalytic activity, which was 12.2 and 12.8 times greater than that of LDH and AgBr, respectively. Furthermore, this composite also exhibited good photocatalytic stability towards Cr(VI) reduction without an obvious decrease after 5 cycles. The formation of a Z-scheme heterojunction in the AgBr@Ag/LDH composite effectively promoted the separation of photogenerated electron-hole pairs and kept the electrons with a high reducing capability in the conduction band of LDH, thus leading to its excellent photocatalytic activity towards the reduction of Cr(VI). This study may provide an insight into the design of the LDH-based Z-scheme photocatalytic systems for Cr(VI)-containing wastewater treatment.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Layered Double Hydroxides Synthesis and Applications · Covalent Organic Framework Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (51)
Show source-provided references
1. Highly active Fe2O3-doped TiO2 photocatalyst for degradation of trichloroethylene in air under UV and visible light irradiation: experimental and computational studies10.1016/j.apcatb.2014.10.023 ↗
2. Facile fabrication of CdS/ZnAlO heterojunction with enhanced photocatalytic activity for Cr(VI) reduction under visible light10.1016/j.clay.2018.08.019 ↗
3. Efficient construction of bismuth vanadate-based Z-scheme photocatalyst for simultaneous Cr(VI) reduction and ciprofloxacin oxidation under visible light: Kinetics, degradation pathways and mechanism10.1016/j.cej.2018.04.170 ↗
4. Differential effect of biochar upon reduction-induced mobility and bioavailability of arsenate and chromate10.1016/j.chemosphere.2015.08.043 ↗
5. Ion exchange and intercalation properties of layered double hydroxides towards halide anions10.1039/C4DT00620H ↗
6. Fabrication of a Au-loaded CaFe2O4/CoAl LDH p–n junction based architecture with stoichiometric H2&O2 generation and Cr(vi) reduction under visible light10.1039/C8QI00952J ↗
7. Adsorption and reduction of Cr(VI) together with Cr(III) sequestration by polyaniline confined in pores of polystyrene beads10.1021/acs.est.8b02566 ↗
8. TiO2@layered double hydroxide core–shell nanospheres with largely enhanced photocatalytic activity toward O2 generation10.1002/adfm.201404496 ↗
9. Catalytic applications of layered double hydroxides: recent advances and perspectives10.1039/C4CS00160E ↗
10. Microwave-assisted synthesis of CoAl-layered double hydroxide/graphene oxide composite and its application in supercapacitors10.1016/j.electacta.2012.08.078 ↗
11. Activating hierarchically hortensia-like CoAl layered double hydroxides by alkaline etching and anion modulation strategies for the efficient oxygen evolution reaction10.1039/C9DT00538B ↗
12. Novel hierarchical Sn3O4/BiOX (X= Cl, Br, I) p-n heterostructures with enhanced photocatalytic activity under simulated solar light irradiation10.1039/C9DT01184F ↗
13. Facile synthesis of hierarchically nanostructured bismuth vanadate: an efficient photocatalyst for degradation and detection of hexavalent chromium10.1016/j.jhazmat.2019.01.017 ↗
14. Anchoring AgBr nanoparticles on nitrogen-doped graphene for enhancement of electrochemiluminescence and radical stability10.1039/C4CC09926E ↗
15. The role of thiocyanate in enhancing the process of sulfite reducing Cr(VI) by inhibiting the formation of reactive oxygen species10.1016/j.jhazmat.2017.09.015 ↗
16. Novel CoAl-LDH/g-C3N4/RGO ternary heterojunction with notable 2D/2D/2D configuration for highly efficient visible-light-induced photocatalytic elimination of dye and antibiotic pollutants10.1016/j.jhazmat.2019.01.114 ↗
17. N-doped C dot/CoAl-layered double hydroxide/g-C3N4 hybrid composites for efficient and selective solar-driven conversion of CO2 into CH410.1016/j.compositesb.2019.107212 ↗
18. Synthetic routes, structure and catalytic activity of Ag/BN nanoparticle hybrids toward CO oxidation reaction10.1016/j.jcat.2018.10.016 ↗
19. Photocatalytic reduction of Cr(VI) on hematite nanoparticles in the presence of oxalate and citrate10.1016/j.apcatb.2018.09.059 ↗
20. P25@CoAl layered double hydroxide heterojunction nanocomposites for CO2 photocatalytic reduction10.1016/j.apcatb.2017.03.006 ↗
21. Facile development of CoAl-LDHs/RGO nanocomposites as photocatalysts for efficient hydrogen generation from water splitting under visible-light irradiation10.1039/C9QI00307J ↗
22. Intercorrelated superhybrid of AgBr supported on graphitic-C3N4-decorated nitrogen-doped graphene: high engineering photocatalytic activities for water purification and CO2 reduction10.1002/adma.201502755 ↗
23. Uncovering the key role of the fermi level of the electron mediator in a Z-scheme photocatalyst by detecting the charge transfer process of WO3-metal-gC3N4 (metal= Cu, Ag, Au)10.1021/acsami.5b10613 ↗
24. Hierarchically porous MoS2/CoAl-LDH/HCF with synergistic adsorption-photocatalytic performance under visible light irradiation10.1016/j.jallcom.2016.12.310 ↗
25. Synergy of photocatalysis and adsorption for simultaneous removal of Cr(VI) and Cr(III) with TiO2 and titanate nanotubes10.1016/j.watres.2013.12.043 ↗
26. ZIF-67-derived 3D hollow mesoporous crystalline Co3O4 wrapped by 2D g-C3N4 nanosheets for photocatalytic removal of nitric oxide10.1002/smll.201902291 ↗
27. Fabrication of Z-scheme g-C3N4/RGO/Bi2WO6 photocatalyst with enhanced visible-light photocatalytic activity10.1016/j.cej.2016.01.031 ↗
28. A review on the recent progress, challenges and perspective of layered double hydroxides as promising photocatalysts10.1039/C6TA01668E ↗
29. In situ synthesis of n–n Bi2MoO6 & Bi2S3 heterojunctions for highly efficient photocatalytic removal of Cr(vi)10.1039/C8TA08294D ↗
30. Effect of the synthesis route and Fe presence on the redox activity of Ni in layered double hydroxides10.1002/celc.201600197 ↗
31. Electrochemical reduction of hexavalent chromium on titania nanotubes with urea as an anolyte additive10.1016/j.electacta.2018.07.194 ↗
32. Cocatalyst free Z-schematic enhanced H2 evolution over LaVO4/BiVO4 composite photocatalyst using Ag as an electron mediator10.1016/j.apcatb.2017.08.082 ↗
33. Fabrication of 3D mesoporous networks of assembled CoO nanoparticles for efficient photocatalytic reduction of aqueous Cr(VI)10.1016/j.apcatb.2017.09.064 ↗
34. Insitu growth of ZIF-8 on CoAl layered double hydroxide/carbon fiber composites for highly efficient absorptive removal of hexavalent chromium from aqueous solutions10.1016/j.clay.2019.04.013 ↗
35. Electrochemical functionalization of polypyrrole nanowires for the development of ultrasensitive biosensors for detecting microRNA10.1016/j.snb.2018.10.131 ↗
36. Photoreduction of carbon dioxide of atmospheric concentration to methane with water over CoAl-layered double hydroxide nanosheets10.1039/C8TA01309H ↗
37. Photogenerated charge transfer via interfacial internal electric field for significantly improved photocatalysis in direct Z-scheme oxygen-doped carbon nitrogen/CoAl-layered double hydroxide heterojunction10.1016/j.apcatb.2018.01.069 ↗
38. Mechanisms for the enhanced photo-Fenton activity of ferrihydrite modified with BiVO4 at neutral pH10.1016/j.apcatb.2017.04.064 ↗
39. Constructing a new Z-scheme multi-heterojunction photocataslyts Ag-AgI/BiOI-Bi2O3 with enhanced photocatalytic activity10.1016/j.jhazmat.2019.03.031 ↗
40. Engineering nanoporous Ag/Pd core/shell interfaces with ultrathin Pt doping for efficient hydrogen evolution reaction over a wide pH range10.1039/C8TA04059A ↗
41. Preparation of two dimensional layered double hydroxide nanosheets and their applications10.1039/C7CS00318H ↗
42. Highly efficient sunlight-driven reduction of Cr(VI) by TiO2@NH2-MIL-88B(Fe) heterostructures under neutral conditions10.1016/j.apcatb.2019.03.068 ↗
43. Synthesis of four-angle star-like CoAl-MMO/BiVO4 p-n heterojunction and its application in photocatalytic desulfurization10.1039/C7RA03012F ↗
44. One-step, room temperature generation of porous and amorphous cobalt hydroxysulfides from layered double hydroxides for superior oxygen evolution reactions10.1039/C8TA08149B ↗
45. Preparation of ZnIn2S4 nanosheet-coated CdS nanorod heterostructures for efficient photocatalytic reduction of Cr(VI)10.1016/j.apcatb.2018.03.017 ↗
46. Sustainable disposal of Cr(VI): adsorption-reduction strategy for treating textile wastewaters with amino-functionalized boehmite hazardous solid wastes10.1021/acssuschemeng.8b00640 ↗
47. Variations of stable isotope fractionation during bacterial chromium reduction processes and their implications10.1016/j.chemgeo.2018.02.004 ↗
48. Layered double hydroxide nanostructured photocatalysts for renewable energy production10.1002/aenm.201501974 ↗
49. Jaroniec, All-solid-state Z-scheme photocatalytic systems10.1002/adma.201400288 ↗
50. A facet-dependent schottky-junction electron shuttle in a BiVO4{010}-Au-Cu2O Z-scheme photocatalyst for efficient charge separation10.1002/adfm.201801214 ↗
51. Visible-light Ag/AgBr/ferrihydrite catalyst with enhanced heterogeneous photo-fenton reactivity via electron transfer from Ag/AgBr to ferrihydrite10.1016/j.apcatb.2018.08.025 ↗