In situ synthesis of Cl-doped Bi₂O₂CO₃ and its enhancement of photocatalytic activity by inducing generation of oxygen vacancies

Abstract

Cl-Doped Bi2O2CO3 is prepared using ionic liquids as dopants and the oxygen-vacancy-induced photocatalytic mechanism is revealed.

In situ construction of a C3N5 nanosheet/Bi2WO6 nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

“…Further, the creation of structural defects has proved to be a viable method to upgrade the photocatalytic behavior of materials because the structural defect-induced localized states ensure a better light response and efficient separation of photo-excited carriers. [35][36][37] Enlightened by the aforementioned facts, we report a C 3 N 5 / Bi 2 WO 6 S-scheme heterojunction with enhanced structural defects built from 0D Bi 2 WO 6 nanodots and 2D C 3 N 5 nanosheets, which exhibits significantly improved photocatalytic performance in removing tetracycline hydrochloride (TC) and Cr(VI) compared to that of single Bi 2 WO 6 or C 3 N 5 . The main reasons can be mainly summarized as follows: (1) forming a close heterojunction structure by coupling 0D Bi 2 WO 6 with 2D C 3 N 5 is easy, (2) as XPS, EPR, UPS, and the band gap structure confirm, a step-scheme electron/hole transfer mechanism significantly promotes the separation and transfer of photogenerated electrons and holes as well as reinforces the redox ability of electrons and holes, and (3) the enhanced structural defects of C 3 N 5 /Bi 2 WO 6 may afford it stronger activation and photocatalytic activity.…”

“…Further, the creation of structural defects has proved to be a viable method to upgrade the photocatalytic behavior of materials because the structural defect-induced localized states ensure a better light response and efficient separation of photo-excited carriers. 35–37…”

Insight into the relationship between redox ability and separation efficiency via the case of α-Bi2O3/Bi5NO3O7

“…[1][2][3] Semiconductor photocatalysis technology has the characteristics of high-efficiency, non-toxicity, low cost, fast reaction rate and no secondary pollution, and it has been proven to be a useful method to deal with antibiotic water pollution. [4][5][6][7] Therefore, the development of highefficiency nano-photocatalysts has attracted the attention of researchers. 8 Among semiconductor photocatalysts, ZnO is a low-cost, non-toxic material, but with high recombination efficiency of photogenerated carriers.…”

In Situ One-Pot Synthesis of C-Decorated and Cl-Doped Sea-Urchin-like Rutile Titanium Dioxide with Highly Efficient Visible-Light Photocatalytic Activity

“…The 0.4Cl-TiO 2 /C with the highest content of Cl exhibited the highest OVs intensities. More OVs can capture more free electrons, improving the separation of photoinduced charge pairs and promoting photocatalytic degradation …”

“…More OVs can capture more free electrons, improving the separation of photoinduced charge pairs and promoting photocatalytic degradation. 49 3.2. Optical Properties.…”