In-built Tb 4+ /Tb 3+ redox centers in terbium-doped bismuth molybdate nanograss for enhanced photocatalytic activity

et al. 2019

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195

Highly active photocatalysts driving chemical reactions are of paramount importance toward renewable energy substitutes and environmental protection. As a fascinating Aurivillius phase material, Bi 2 MoO 6 has been the hotspot in photocatalytic applications due to its visible light absorption, nontoxicity, low cost, and high chemical durability. However, pure Bi 2 MoO 6 suffers from low efficiency in separating photogenerated carriers, small surface area, and poor quantum yield, resulting in low photocatalytic activity. Various strategies, such as morphology control, doping/defect-introduction, metal deposition, semiconductor combination, and surface modification with conjugative π structures, have been systematically explored to improve the photocatalytic activity of Bi 2 MoO 6 . To accelerate further developments of Bi 2 MoO 6 in the field of photocatalysis, this comprehensive Review endeavors to summarize recent research progress for the construction of highly efficient Bi 2 MoO 6 -based photocatalysts. Furthermore, benefiting from the enhanced photo catalytic activity of Bi 2 MoO 6 -based materials, various photocatalytic applications including water splitting, pollutant removal, and disinfection of bacteria, were introduced and critically reviewed. Finally, the current challenges and prospects of Bi 2 MoO 6 are pointed out. This comprehensive Review is expected to consolidate the existing fundamental theories of photo catalysis and pave a novel avenue to rationally design highly efficient Bi 2 MoO 6 -based photocatalysts for environmental pollution control and green energy development.

Section: Modulated Strategies Of Bi2moo6‐based Materials With Multifusupporting

confidence: 54%

Section: Modulated Strategies Of Bi2moo6‐based Materials With Multifumentioning

confidence: 99%

Modulation of Bi₂MoO₆‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Jiang

et al. 2019

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195

“…The distinctive peaks at 2 θ =28.3°, 32.8°, 47.1°, 55.8°, and 58.5° were well‐matched with the lattice planes of (1,3,1), (2,0,0), (2,0,2), (3,3,1), and (2,6,2), respectively. As shown in Figure A, doping with samarium and nitrogen did not generate a new phase or any changes in the preferential orientations because of their low content . However, some shift of the peaks at about 2 θ values of 28.3° was observed, which correspond to the (1,3,1) planes (Figure B).…”

Section: Resultsmentioning

confidence: 95%

Samarium and Nitrogen Co‐Doped Bi₂WO₆ Photocatalysts: Synergistic Effect of Sm³⁺/Sm²⁺ Redox Centers and N‐Doped Level for Enhancing Visible‐Light Photocatalytic Activity

et al. 2016

Chemistry A European J

Self Cite

Samarium and nitrogen co-doped Bi2 WO6 nanosheets were successfully synthesized by using a hydrothermal method. The crystal structures, morphology, elemental compositions, and optical properties of the prepared samples were investigated. The incorporation of samarium and nitrogen ions into Bi2 WO6 was proved by X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. UV/Vis diffuse reflectance spectroscopy indicated that the samarium and nitrogen co-doped Bi2 WO6 possessed strong visible-light absorption. Remarkably, the samarium and nitrogen co-doped Bi2 WO6 exhibited higher photocatalytic activity than single-doped and pure Bi2 WO6 under visible-light irradiation. Radical trapping experiments indicated that holes (h(+) ) and superoxide radicals ((.) O2 (-) ) were the main active species. The results of photoluminescence spectroscopy and photocurrent measurements demonstrated that the recombination rate of the photogenerated electrons and holes pairs was greatly depressed. The enhanced activity was attributed to the synergistic effect of the in-built Sm(3+) /Sm(2+) redox pair centers and the N-doped level. The mechanism of the excellent photocatalytic activity of Sm-N-Bi2 WO6 is also discussed.

“…For instance, Chen et al have synthesized V 4+ and Ce 3+ self‐doped BiVO 4 /CeO 2 heterostructure nanocomposites; the prepared photocatalysts show significantly boosted photocatalytic performance and photoelectrochemical activities under visible‐light irradiation. Further, our research group has also obtained some constructive results concerning multivalent lanthanide‐modified semiconductor photocatalysis, and has proposed a new conception of redox heterojunctions. Hence, we have reason to believe that multivalent lanthanide‐metal oxides could be excellent candidates to modify g‐C 3 N 4 for attaining high‐efficiency photocatalytic activity.…”

Section: Introductionmentioning

confidence: 98%

Construction of Eu₂O₃/g‐C₃N₄ Redox Heterojunctions Containing Eu³⁺/Eu²⁺ Self‐Redox Centers for Boosted Visible‐Light Photocatalytic Activity

et al. 2018

Eur J Inorg Chem

Self Cite

The in-built self-redox couple in a heterojunction can indeed boost its photocatalytic activity. Herein, to obtain highly efficient visible-light photocatalysis, a new Eu 2 O 3 /g-C 3 N 4 redox heterojunction is designed and fabricated by a facile in situ growth strategy. Compared with pure g-C 3 N 4 , the as-prepared Eu 2 O 3 /g-C 3 N 4 redox heterojunction shows extremely enhanced photocatalytic performance for the decontamination of organic contaminants under visible-light irradiation. The presence of the Eu 3+ /Eu 2+ self-redox couple is identified by X-ray photoelectron spectroscopy spectra analysis, before and after photoreaction. The boosted photocatalytic mechanism is explored systematically through UV/Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and photocurrent measure- [a]