2D/2D heterostructured photocatalyst: Rational design for energy and environmental applications

Chinese Journal of Catalysis

et al. 2021

219

Bismuth tungstate (Bi2WO6) has become a research hotspot due to its potential in photocatalytic energy conversion and environmental purification. Nevertheless, the limited light absorption and fast recombination of photogenerated carriers hinder the further improvement of the photocatalytic performance of Bi2WO6. Herein, we provide a systematic review for the recent advances on Bi2WO6-based photocatalysts. It starts with the crystal structure, optical properties and photocatalytic fundamentals of Bi2WO6. Then, we focus on the modification strategies of Bi2WO6 based on morphology control, atomic modulation and composite fabrication for diverse photocatalytic applications, such as organic synthesis, water splitting, CO2 reduction, water treatment, air purification, bacterial inactivation, etc. Finally, some current challenges and future development prospects are proposed. We expect that this review can provide a useful reference and guidance for the development of efficient Bi2WO6 photocatalysts.

Section: Composite Fabricationmentioning

confidence: 99%

Recent advances on Bi2WO6-based photocatalysts for environmental and energy applications

Chen

Chinese Journal of Catalysis

et al. 2021

219

“…It is widely accepted that a face‐to‐face stacking of 2D semiconductors could enable strong heterogeneous interaction, benefiting from the large and intimate surface contact. [ 76 ] Inspired by the merits, our group synthesized a Z‐scheme g‐C 3 N 4 /TiO 2 heterojunction with face‐to‐face geometry. In the photocatalytic performance tests, the heterojunction showed enhanced inactivation activity toward E. coli, mainly because of the promoted generation of ⋅O 2 − .…”

Section: Ros‐induced Bacteria Inactivation Over 2d Semiconductorsmentioning

confidence: 99%

“…[ 73 ] For heterojunctions with face‐to‐face structures, the large contact area and strong interactions realize a better electrochemical coupling compared with other geometries. [ 76 ]…”

Section: Ros‐induced Bacteria Inactivation Over 2d Semiconductorsmentioning

confidence: 99%

Solar‐Driven Photocatalytic Disinfection Over 2D Semiconductors: The Generation and Effects of Reactive Oxygen Species

Zeng

et al. 2020

Solar RRL

Self Cite

Solar‐driven photocatalysis has been developing as a sustainable process and it holds appreciable promise to address the pollutants and risks posed by biohazards. The unique geometrical and electric features of 2D semiconductors have nurtured a variety of advanced photocatalytic bactericides where oxidative oxygen species are generated as the main disinfection reagents. Herein, the state‐of‐the‐art progress of solar‐driven photocatalytic disinfection based on 2D semiconductors with an emphasis on the generation and effects of various reactive oxygen species is summarized. Moreover, the immobility of the photocatalyst for practical applications is discussed. Finally, perspectives and challenges are presented to guide future research on photocatalytic disinfection.

“…However, C 3 N 4 is generally prepared through calcination of nitrogen-containing materials. Therefore, the obtained bulk C 3 N 4 suffers from an inefficiently low surface area, which will reduce the surface active sites [18][19][20]. Photocatalytic reactions occur at the active sites of catalysts; therefore, the active site is an important factor that influences the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Boosted charge transfer and photocatalytic CO2 reduction over sulfur-doped C3N4 porous nanosheets with embedded SnS2-SnO2 nanojunctions

Chen

et al. 2021

Sci. China Mater.

Two-dimensional porous nanosheet heterostructure materials, which combine the advantages of both architecture and components, are expected to feature a significant photocatalytic performance toward CO 2 conversion into useful fuels. Herein, we provide a facile strategy for fabricating sulfur-doped C 3 N 4 porous nanosheets with embedded SnO 2 -SnS 2 nanojunctions (S-C 3 N 4 /SnO 2 -SnS 2 ) via liquid impregnation-pyrolysis and subsequent sulfidation treatment using a layered supramolecular structure as the precursor of C 3 N 4 . A hexagonal layered supramolecular structure was first prepared as the precursor of C 3 N 4 . Then Sn 4+ ions were intercalated into the supramolecular interlayers through the liquid impregnation method. The subsequent annealing treatment in air simultaneously realized the fabrication and efficient exfoliation of layered C 3 N 4 porous nanosheets. Moreover, SnO 2 nanoparticles were formed and embedded in situ in the porous C 3 N 4 nanosheets. In the following sulfidation process under a nitrogen atmosphere, sulfur powder can react with SnO 2 nanoparticles to form SnO 2 -SnS 2 nanojunctions. As expected, the exfoliation of sulfur-doped C 3 N 4 porous nanosheets and ternary heterostructure construction could be simultaneously achieved in this work. Sulfur-doped C 3 N 4 porous nanosheets with embedded SnO 2 -SnS 2 nanojunctions featured abundant active sites, enhanced visible light absorption, and efficient interfacial charge transfer. As expected, the optimized S-C 3 N 4 /SnO 2 -SnS 2 achieved a much higher gas-phase photocatalytic CO 2 reduction performance with high yields of CO (21.68 µmol g −1 h −1 ) and CH 4 (22.09 µmol g −1 h −1 ) compared with the control C 3 N 4 , C 3 N 4 / SnO 2 , and S-C 3 N 4 /SnS 2 photocatalysts. The selectivity of CH 4 reached 80.30%. Such a promising synthetic strategy can be expected to inspire the design of other robust C 3 N 4 -based porous nanosheet heterostructures for a broad range of applications. Keywords: sulfur-doped C 3 N 4 , porous nanosheets, SnO 2 -SnS 2 nanojunctions, tunable composition, CO