Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 384, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.121417
Keywords
Graphitic carbon nitride; Cellulose acetate; Porous film; Photocatalysis; Water treatment
Categories
Funding
- National Key R&D Program of China [2017YFD0801504]
- National Natural Science Foundation of China [41771342, 51402175]
- Shandong Provincial Natural Science Foundation of China [ZR2019MEM018]
- Funds of Shandong Double Tops Program [SYL2017XTTD15]
- Project of Shandong Province Higher Educational Science and Technology Program [J18KA008]
- Dodd Walls Centre for Photonic and Qunatum Technologies
- MacDiarmid Institute for Advanced Materials and Nanotechnology
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This study describes the successful fabrication of flexible photocatalytic films to remove contaminants from wastewater, the film is comprising sulfuric acid treated graphitic carbon nitride (SA-g-C3N4) embedded within a porous cellulose network (denoted here as CN/CA films). The SA-g-C3N4 content in the films was varied from 0 to 50 wt.%. The sulfuric acid treatment introduced carboxyl and sulfonyl groups on the surface of g-C3N4, which resulted in strong hydrogen bonding with the hydroxyl groups of cellulose acetate (so strong the partial delimination of the SA-g-C3N4 occurred on CN/CA film formation via solvent casting). The obtained films were around 10 pm in thickness, extremely flexible and durable, with the SA-g-C3N4 uniformly distributed throughout the cellulose acetate network. The CN/CA films showed excellent activities for aqueous dye degradation under direct sunlight, as well as outstanding performance for photocatalytic reduction of Cr (VI). The photocatalytic activity of the CN/CA films at the optimum SA-g-C3N4 content of 50 wt.% was far higher than that of pristine SA-g-C3N4, highlighting a main advantage of the composite film fabrication strategy introduced here. Further, the CN/CA films showed excellent stability and reusability, with no loss in activity seen over 5 cycles of dye degradation.
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