Stable Ag2O/g-C3N4 p-n heterojunction photocatalysts for efficient inactivation of harmful algae under visible light

Construction of an Ultrathin S‐Scheme Heterojunction Based on Few‐Layer g‐C3N4 and Monolayer Ti3C2Tx MXene for Photocatalytic CO2 Reduction

“…[ 9–13 ] Moreover, g‐C 3 N 4 is a good visible‐light‐response semiconductor with a bandgap of 2.7 eV; [ 14,15 ] its suitable conduction band (CB) position (−1.12 eV vs NHE) endows it with a strong reducing ability. [ 16 ] Therefore, g‐C 3 N 4 with semiconductors that have strong oxidizing ability, such as ZnIn 2 S 4 , [ 17 ] Bi 4 O 5 I 2 , [ 18 ] and Ag 2 O, [ 19 ] were applied to prepare various heterogeneous photocatalysts. Although all of them show enhanced activities for their improved carrier separation efficiency, their II‐scheme photocatalytic mechanism weakens their redox abilities relative to individual components.…”

Fabrication of g-C3N4 Nanosheets Anchored With Controllable CdS Nanoparticles for Enhanced Visible-Light Photocatalytic Performance

“…First, g-C 3 N 4 nanosheets were prepared according to the previous report ( Fan et al, 2020 ). Briefly, the amount of urea was heated at 570°C under air for 3 h, and the yellow product was obtained for further use.…”

“…Recently, g-C 3 N 4 has received considerable attention as a promising photocatalyst, owing to its ease of preparation, high stability, low cost, clean and low toxicity, narrowed bandgap (∼2.7 eV), and special two-dimensional (2D) layered structure ( Shi et al, 2016 ; Teng et al, 2017 ; Han et al, 2018 ; Deng et al, 2019 ; Ong et al, 2020 ; Vu et al, 2020 ; Yu et al, 2021 ); however, diverse drawbacks include poor efficiency of light utilization and low separation of photogenerated charges during the application, making g-C 3 N 4 less attractive for photocatalyst construction. ( Tahir et al, 2014 ; Liu et al, 2017 ; Al Marzouqi et al, 2019 ; Fu et al, 2019 ; Fan et al, 2020 ). In addition, bulk g-C 3 N 4 with a low surface area and irregular morphology prepared through the conventional method leads to the low transfer rate of interfacial charge and poor photocatalytic activity ( Teng et al, 2017 ; Niu et al, 2018 ).…”

One-pot construction of robust BiOCl/ZnO p–n heterojunctions with semi-coherent interfaces toward improving charge separation for photodegradation enhancement

“…However, the photogenerated electrons (e − ) and holes (h + ) recombine easily and cannot efficiently transfer to the surface reactive sites for redox reaction in general. In the past few years, many approaches have been made to improve the surface charge separation, such as 35 noble metal deposition, [11][12] heterojunction [13][14][15] and defect engineering. [16][17][18] In particular, the construction of heterojunction is effective to limit the recombination of photogenerated e − and h + and thereby enhance the photocatalytic activity.…”