Vis‐NIR Light‐Responsive Photocatalytic Activity of C₃N₄−Ag−Ag₂O Heterojunction‐Decorated Carbon‐fiber Cloth as Efficient Filter‐Membrane‐Shaped Photocatalyst

Abstract

C3N4‐decorated carbon‐fiber (CF) cloth has been demonstrated to be a filter‐membrane‐shaped photocatalyst for degrading flowing wastewater, but it can be excited only by visible light (λ<450 nm). To extend the photoresponse range to NIR region, herein we have designed and prepared C3N4−Ag−Ag2O heterojunctions on CF cloth. The growth of C3N4 nanosheets (thickness: 20–30 nm) on CF cloth is realized by a thermal condensation method, and then Ag/Ag2O nanoparticles (10–20 nm) are deposited on CF/C3N4 cloth by a chemical precipitation method. CF/C3N4/Ag/Ag2O cloth exhibits excellent flexibility and strong photoabsorption in a broad Vis‐NIR region (400–1400 nm), wider than CF/C3N4 (absorption edge: 450 nm). Under the irradiation of 808 nm or 980 nm laser, CF/C3N4/Ag/Ag2O cloth can remove 83 %/41 % AO7 and 72 %/38 % 4‐CP in 140 min respectively, significantly higher than those (33 %/13 % AO7 and 31 %/10 % 4‐CP) by CF/Ag/Ag2O cloth and those (3 %/1 % AO7 and 0 %/1 % 4‐CP) by CF/C3N4 cloth. Interestingly, when CF/C3N4/Ag/Ag2O cloth is used as the filter‐membrane to photo‐degrade the flowing wastewater (AO7, 20 mg L−1, rate: 1.5 L h−1), the removal efficiency of AO7 reaches up 97 % after 8 grade reactors. Therefore, CF/C3N4/Ag/Ag2O cloth can be used as an efficient filter‐membrane‐shaped photocatalyst with NIR photoresponse.

Removal of Cr(VI) from Acid Wastewater by BC/ZnFe2O4 Magnetic Nanocomposite via the Synergy of Absorption‐Photocatalysis

“…[27][28][29] Similarly, the Fe 2p spectra of BC/ZnFe 2 O 4 shows lower binding energy (711.27 eV, 713.58 eV, 719.58 eV, 725.59 eV and 733.62 eV) than that of ZnFe 2 O 4 , resulting from the electrons transfer from ZnFe 2 O 4 to BC. [30,31] The above results further explain the presence of BC and ZnFe 2 O 4 . Finally, highresolution XPS spectra of Cr 2p from BC/ZnFe 2 O 4 after photo- catalytic reaction was observed ( Figure 2f).…”

Synthesis and applications of graphitic carbon nitride (g-C3N4) based membranes for wastewater treatment: A critical review

“…Strong interaction between g-C 3 N 4 and the substrate can be achieved during high-temperature sintering, which is beneficial for the secure fixing of photocatalyst coating. Increasing the amount of photoactive component in the composite membranes through several coating methods resulted in better photodegradation performance [ 57 ].…”

Synthesis of MoS2/CdS Heterostructures on Carbon‐Fiber Cloth as Filter‐Membrane‐Shaped Photocatalyst for Purifying the Flowing Wastewater under Visible‐Light Illumination

“…Carbon‐fiber (CF) cloth is a promising substrate with outstanding conductivity, flexibility, strength, etc . Recently, our group has prepared C 3 N 4 , TiO 2 /C 3 N 4 and C 3 N 4 /Ag/Ag 2 O on CF cloths as filter‐membrane‐shaped photocatalysts, and they (diameter: ∼10 cm) exhibit excellent photocatalytic activity, stability and recyclability for purifying the flowing wastewater. Considering that MoS 2 /CdS heterostructures have good photodegradation performance but poor recyclability, we realized the in‐situ growth of MoS 2 /CdS heterostructures on flexible and conductive CF cloth, through a hydrothermal‐chemical bath deposition two‐step route.…”