Solvent-exfoliation of transition-metal dichalcogenide MoS2 to provide more active sites for enhancing photocatalytic performance of BiOIO3/g-C3N4 photocatalyst

Guan, Yu; Wu, Jiang; Lin, Yu-Yu; Liu, Qizhen; Qi, Yongfen; Pan, Weiguo; He, Ping; Qi, Xiaoqiong; Wang, Run; Ji, Zhonghao

doi:10.1016/j.apsusc.2019.03.177

Cited by 57 publications

(15 citation statements)

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“…[ 9,10 ] This space‐separation hinders the recombination process, which is the primary detrimental event in conventional photocatalysts. Nowadays, the family of composite materials is quite broad, including metal‐oxide, [ 7,11–15 ] oxide/graphene, [ 16,17 ] oxide/oxide heterostructures, [ 18–26 ] as well as composites in which an oxide is combined with a low‐band gap semiconductor, [ 27–33 ] to promote visible light absorption. In general, the two composing units of a hybrid material can be two different solids, as well as two polymorphs or the same oxide.…”

Section: Introductionmentioning

confidence: 99%

Nature and Role of Surface Junctions in BiOIO₃ Photocatalysts

Liberto

Tosoni

Pacchioni

2021

Adv Funct Materials

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BiOIO3 photocatalysts exposing (010) and (100) surfaces show high efficiency in photocatalytic experiments thanks to an efficient charge separation: photogenerated electrons migrate to the (010) face, and holes move to the (100) one (F. Chen, et al.). However, if one considers the band alignment of the two thermodynamically most stable terminations of the (010) and (100) surfaces as derived from high‐level density functional theory calculations, the band alignment is opposite to the experiment even if the formation of an explicit (010)/(100) junction is considered. To reconcile theory with experiment, one has to invoke the formation of a junction between a less stable (010) surface termination with the most stable (100) one. New chemical bonds at the interface result in a thermodynamically stable system and a significant charge transfer. This junction not only provides the correct band alignment, but also a position of the energy levels that is fully consistent with the experiment. This shows that in order to rationalize the behavior of semiconducting materials where charge separation helps the photoactivity, one has to describe the formation of explicit interfaces with atomistic precision, and to take into account the overall thermodynamic stability of the system.

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Section: Introductionmentioning

confidence: 99%

Nature and Role of Surface Junctions in BiOIO₃ Photocatalysts

Liberto

Tosoni

Pacchioni

2021

Adv Funct Materials

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“…Apart from the characteristic peaks of Hg, there is no significant change in the spectrum of the spent catalyst compared with that of the fresh specimen (Figure S7). These results show that the Hg 0 species will be oxidized into HgO during the photocatalytic reaction …”

Section: Results and Discussionmentioning

confidence: 73%

“…These results show that the Hg 0 species will be oxidized into HgO during the photocatalytic reaction. 3 The segregation efficiency of composites for the photogenerated charge was analyzed by PL, as provided in Figure 6a. The peak intensity of the MoS 2 /g-C 3 N 4 photocatalyst decreases obviously, revealing that MoS 2 /g-C 3 N 4 can inhibit the recombination between the photogenerated electrons and holes effectively.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it is very urgent to deal with these issues . In recent decades, semiconductor photocatalysis as one of the most effective technologies has been widely used to resolve the pollution troubles, attributing to its superiorities in relatively high efficiency, low production cost, and environmental protection. , Recently, a series of studies have been conducted on the removal of elemental mercury (Hg 0 ) by photocatalytic oxidation. Wang et al synthesized iron and cerium co-doped titanium dioxide using the sol–gel method and achieved high efficiency in the photooxidation of Hg 0 .…”

Section: Introductionmentioning

confidence: 99%

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Composites of MoS₂ Nanosheets and Graphitic Carbon Nitride Nanosheets for Photocatalytic Mercury Removal

Xie

et al. 2021

ACS Appl. Nano Mater.

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In this study, a type of nano-photocatalyst of MoS 2 /g-C 3 N 4 with a 2D/2D heterostructure was successfully developed using the impregnationcalcination method. The developed composite catalyst exhibited enhanced photocatalytic activity and stability in the removal of Rhodamine B (RhB) and vaporous Hg 0 under the irradiation of visible light. The introduced MoS 2 nanosheets could serve as a platform for the dispersion of g-C 3 N 4 nanosheets, which was conducive to the exposure of more active sites. In addition, the MoS 2 nanosheets also facilitated the capacity for absorption of optical light and separation of the photogenerated electron from the hole, leading to the promotion of photocatalytic efficiency.

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“…To suppress electron–hole recombination, coupling a proper cocatalyst with WO 3 to construct composite photocatalysts has proven to be an effective method. In addition, the incorporation of oxidation or reduction cocatalysts can promote oxidation or reduction reactions by providing active sites …”

Section: Introductionmentioning

confidence: 99%

One‐step synthesis of a WO₃‐CuS nanosheet heterojunction with enhanced photocatalytic performance for methylene blue degradation and Cr(VI) reduction

Liu

Zhang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: The photocatalytic activity of a pristine semiconductor is unsatisfactory due to the rapid recombination of photogenerated electrons and holes. Constructing composite photocatalysts has proven to be an effective method to suppress electron-hole recombination. The composites composed of two materials usually are synthesized through a two-step process. However, in this work, a simple one-step solvothermal method employing an homogeneous reaction system was adopted to synthesize a tungsten trioxide (WO 3 )-copper sulfide (CuS) nanosheet heterojunction with enhanced photocatalytic properties. RESULTS: The formation of the WO 3 -CuS heterojunction was confirmed by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray and X-ray photoelectron spectroscopy analysis. The composites showed improved visible light harvesting ability, and enhanced photoelectric and photocatalytic properties compared with pure WO 3 . The optimized composite displayed a photocurrent almost five-fold greater than the sum of the photocurrents of WO 3 and CuS, and had superior performance for methylene blue (MB) degradation and hexavalent chromium [Cr(VI)] reduction. The MB degradation and Cr(VI) reduction efficiencies were both improved when they co-existed in the photocatalytic system. Interferential ions Cl − and NO 3− were much less effective in the degradation of MB than in the reduction of Cr(VI). CONCLUSIONS: Improved photocatalytic activity was achieved after coupling CuS with WO 3 , due to the enhanced visible light absorption and efficient electron-hole separation. Photogenerated holes were found to be the dominant reactive species in the MB photodegradation process. A synergistic effect existed between MB degradation and Cr(VI) reduction. Interferential ions Cl − and NO 3 − had much greater effect on Cr(VI) reduction than MB degradation. Evaluation of the interference effects of ionsInorganic ions, such as chloride (Cl − ) and nitrate (NO 3 − ) ions, are found widely in natural water sources, and may interfere with the photocatalysis process. Ion interference experiments were conducted herein to investigate the photocatalytic activity of WO 3 -CuS in the presence of Cl − or NO 3 − ions. As shown in Fig. 10, Cl − and NO 3 − had little effect on MB degradation, whereas they J Chem Technol Biotechnol 2020; 95: 665-674

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Solvent-exfoliation of transition-metal dichalcogenide MoS2 to provide more active sites for enhancing photocatalytic performance of BiOIO3/g-C3N4 photocatalyst

Cited by 57 publications

References 53 publications

Nature and Role of Surface Junctions in BiOIO₃ Photocatalysts

Nature and Role of Surface Junctions in BiOIO₃ Photocatalysts

Composites of MoS₂ Nanosheets and Graphitic Carbon Nitride Nanosheets for Photocatalytic Mercury Removal

One‐step synthesis of a WO₃‐CuS nanosheet heterojunction with enhanced photocatalytic performance for methylene blue degradation and Cr(VI) reduction

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Solvent-exfoliation of transition-metal dichalcogenide MoS2 to provide more active sites for enhancing photocatalytic performance of BiOIO3/g-C3N4 photocatalyst

Cited by 57 publications

References 53 publications

Nature and Role of Surface Junctions in BiOIO3 Photocatalysts

Nature and Role of Surface Junctions in BiOIO3 Photocatalysts

Composites of MoS2 Nanosheets and Graphitic Carbon Nitride Nanosheets for Photocatalytic Mercury Removal

One‐step synthesis of a WO3‐CuS nanosheet heterojunction with enhanced photocatalytic performance for methylene blue degradation and Cr(VI) reduction

Contact Info

Product

Resources

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Nature and Role of Surface Junctions in BiOIO₃ Photocatalysts

Nature and Role of Surface Junctions in BiOIO₃ Photocatalysts

Composites of MoS₂ Nanosheets and Graphitic Carbon Nitride Nanosheets for Photocatalytic Mercury Removal

One‐step synthesis of a WO₃‐CuS nanosheet heterojunction with enhanced photocatalytic performance for methylene blue degradation and Cr(VI) reduction