Ternary Reduced Graphene Oxide/g‐C₃N₄/Ag‐AgCl Nanocomposites for Controlled Visible‐Light Photocatalytic Selectivity

Abstract

The ternary reduced graphene oxide (rGO)/g‐C3N4/Ag‐AgCl composite photocatalysts were prepared by a combined deposition‐precipitation and in situ photoreduction method. The prepared ternary graphene‐semiconductor‐metal nanocomposite photocatalysts exhibit controlled photocatalytic selectivity and high photocatalytic activity for the degradation of methylene blue (MB) and methyl orange (MO) solution under visible‐light irradiation. Significantly, the controlled photocatalytic selectivity of rGO/g‐C3N4/Ag‐AgCl (GCA) composites towards MO and MB can be modulated by the introduction or elimination of Ag‐AgCl and/or rGO sheets for tuning their surface charges and adsorption properties. In addition, the photocatalytic activity of GCA sample was indeed improved due to the efficient separation of photo‐generated carriers in the GCA composite, which could be attributed to the suitable band gap structure of g‐C3N4/Ag‐AgCl (CA) and the well electronic mobility of rGO sheets. The proposed mechanism for the controlled visible‐light photocatalytic selectivity and the enhanced photocatalytic activity of GCA composite was further confirmed by the trapping experiments, PL spectroscopy and transient photoelectric current response. This work may provide a new practical insight into the fabrication of innovative photocatalysts with the controlled selectivity and enhanced photocatalytic activity for environmental purification, clear energy production and solar energy conversion.

Boosting the Photocatalytic Ability of g-C3N4 for Hydrogen Production by Ti3C2 MXene Quantum Dots

“…The photocurrent intensity of g-C 3 N 4 @Ti 3 C 2 QD composites is higher than that of pristine g-C 3 N 4 NSs, which can be ascribed to Ti 3 C 2 QDs as co-catalysts more effectively capturing photoexcited electrons from g-C 3 N 4 . As shown in Figure b, g-C 3 N 4 @Ti 3 C 2 QD composites exhibit a smaller arc radius compared with g-C 3 N 4 NSs under light illumination, suggesting that g-C 3 N 4 @Ti 3 C 2 QD composites have a smaller carrier transfer resistance, finally causing a higher carrier separation efficiency …”

Progress in biomimetic leverages for marine antifouling using nanocomposite coatings

“…The produced nanocomposite can degrade methyl orange and methylene blue in the visible region. 230 An antibacterial nanocomposite of GO/g-C3N4 hybrids was designed with photocatalytic properties via sonochemical technique at ambient temperature (Figure 16). 211 The introduction of GO is contributed to separate photo-generated electrons and prevented the electron−hole pairs of g-C3N4 from re-combination to generate more h + , thus directly improving the bactericidal ability of GO/g-C3N4.…”

Visible light enhanced photocatalytic degradation of methylene blue by ternary nanocomposite, MoO3/Fe2O3/rGO

“…It offers a good opportunity to prepare composite materials for photocatalysis applications [26][27][28][29]. Researchers recently have shown their more interest in the preparation of rGO-based ternary composites, however such as Fe 3 O 4 -graphene-TiO 2 [30], Ag-ZnO/rGO, Ag-Ag-Br/TiO 2 /rGO [31,32], Ag/TiO 2 /rGO [33], CdS−Graphene−TiO 2 [34], Cu-P25 graphene ternary composite [35], Pt/titania/reduced graphite oxide [36], RGO/ZnS-Ag 2 S [37], reduced graphene oxide/ g-C 3 N 4 /Ag-AgCl [38], reduced graphene-oxide/TiO 2 / ZnO [39], Au@r-GO/TiO 2 hybrids [40] and brilliant Blue/RGO/quaternary phosphonium salt composite [41]. Hence, we have attempted to prepare a costeffective rGO-supported MoO 3 /Fe 2 O 3 ternary nanocomposite via the hydrothermal route, one of the extensively employed methods for the synthesis of various metal oxide nanostructures [42] due to its high purity with controlled stoichiometry, high crystallinity with controlled morphology, microstructure and narrow particle size distribution [43].…”