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Reusable SnO2/g-C3N4/cellulose acetate films for photocatalytic treatment of dye-contaminated wastewater
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DOI：10.1007/s11051-026-06625-x.png)
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Abstract
En 中文
A flexible, free-standing SnO2/g-C3N4/Cellulose Acetate (CA) composite film was made using a simple and eco-friendly solution-casting method for effective treatment of dye-contaminated wastewater. The polymer-supported heterojunction design aimed to reduce nanoparticle clumping and eliminate the need for recovery steps often needed with powdered photocatalysts. The resulting film showed strong visible-light-driven degradation of methylene blue and methyl orange. Structural and morphological tests using XRD, FTIR, and SEM confirmed the even distribution of crystalline SnO2 nanoparticles and two-dimensional g-C3N4 nanosheets in the porous CA matrix. This setup promoted good contact between the materials and allowed better access for dye molecules to the active sites. UV-DRS results showed better visible-light absorption with a smaller optical band gap, indicating improved light-harvesting ability. Photoluminescence studies also showed reduced electron-hole recombination in the SnO2/g-C3N4/CA heterojunction system, supporting greater charge separation efficiency. The composite film achieved 91.97% degradation of methylene blue and 80.95% degradation of methyl orange within 90 min, outperforming the individual components under the same test conditions. The key novelty lies in the first-time development of a free-standing SnO2/g-C3N4/CA photocatalytic film via a green solution-casting approach. The polymer-immobilized heterojunction design effectively overcomes catalyst separation and nanoparticle agglomeration, while providing a scalable, durable, and reusable platform for practical wastewater treatment. [GRAPHICS]
Keywords:
Photocatalysis
SnO2/g-C3N4 composite
Cellulose acetate film
Dye degradation
Visible-light activity
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1.3W
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