Vis‐NIR Light‐Responsive Photocatalytic Activity of C3N4−Ag−Ag2O Heterojunction‐Decorated Carbon‐fiber Cloth as Efficient Filter‐Membrane‐Shaped Photocatalyst. Issue 4 (31st January 2019)

• Record Type: Journal Article
• Authors: Shen, Xiaofeng; Zhang, Yan; Duoerkun, Gumila; Shi, Zhun; Liu, Jianshe; Chen, Zhigang; Keung Wong, Po; Zhang, Lisha
• Is Part Of: ChemCatChem. Volume 11:Issue 4(2019)
• Page Start: 1362
• Page End: 1373
• Publication Date: 2019-01-31
• Subjects: CF/C3N4/Ag/Ag2O cloth -- nanosheets -- nanoparticles -- photocatalysis -- Vis-NIR; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201801805
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: C3 N4 ‐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 C3 N4 −Ag−Ag2 O heterojunctions on CF cloth. The growth of C3 N4 nanosheets (thickness: 20–30 nm) on CF cloth is realized by a thermal condensation method, and then Ag/Ag2 O nanoparticles (10–20 nm) are deposited on CF/C3 N4 cloth by a chemical precipitation method. CF/C3 N4 /Ag/Ag2 O cloth exhibits excellent flexibility and strong photoabsorption in a broad Vis‐NIR region (400–1400 nm), wider than CF/C3 N4 (absorption edge: 450 nm). Under the irradiation of 808 nm or 980 nm laser, CF/C3 N4 /Ag/Ag2 O 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/Ag2 O cloth and those (3 %/1 % AO7 and 0 %/1 % 4‐CP) by CF/C3 N4 cloth. Interestingly, when CF/C3 N4 /Ag/Ag2 O 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/C3 N4 /Ag/Ag2 O cloth can be used as an efficient filter‐membrane‐shaped photocatalyst with NIR photoresponse. Abstract : At a junction ! The growth of C3 N4 /Ag/Ag2 O semiconductor heterojunctions on carbon fiber cloth was realized by a thermal condensation and chemical precipitation two‐step method. CF/C3 N4 /Ag/Ag2 O cloth exhibits excellent flexibility and strong photoabsorption in a broad Vis‐NIR region (400–1400 nm). Under the irradiation of visible light, 808 nm or 980 nm laser, CF/C3 N4 /Ag/Ag2 O cloth displays enhanced photocatalytic activity compared with CF/C3 N4 cloth or CF/Ag/Ag2 O cloth.