Efficient microbial cellulose/Fe 3 O 4 nanocomposite for photocatalytic degradation by advanced oxidation process of textile dyes

Fenton-type advanced oxidative processes (AOP) have been employed to treat textile dyes in aqueous solution and industrial effluent. The work focused on assisting the limitations still presented by the Fenton process regarding the use of suspended iron catalysts. Soon, a nanocomposite of bacterial c...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2023-06, Vol.326, p.138453
Main Authors: Santana, Rayany Magali da Rocha, Napoleão, Daniella Carla, Rodriguez-Diaz, Joan Manuel, Gomes, Rayssa Kelen de Mendonça, Silva, Marina Gomes, Lima, Victor Marcelo Estolano de, Melo Neto, Antônio Acacio de, Vinhas, Glória Maria, Duarte, Marta Maria Menezes Bezerra
Format: Article
Language:English
Subjects:
Catalysis
Coloring Agents - chemistry
Hydrogen Peroxide - chemistry
Iron - chemistry
Nanocomposites
Oxidation-Reduction
Textiles
Water Pollutants, Chemical - analysis
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Summary:Fenton-type advanced oxidative processes (AOP) have been employed to treat textile dyes in aqueous solution and industrial effluent. The work focused on assisting the limitations still presented by the Fenton process regarding the use of suspended iron catalysts. Soon, a nanocomposite of bacterial cellulose (BC) and magnetite (Fe O ) was developed. It has proven to be superior to those available in the literature, exhibiting purely catalytic properties and high reusability. Its successful production was verified through analytical characterization, while its catalytic potential was investigated in the treatment of different textile matrices. In initial tests, the photo-Fenton process irradiated and catalyzed by sunlight and BC/Fe O discolored 92.19% of an aqueous mixture of four textile dyes. To improve the efficiency, the design of experiments technique evaluated the influence of the variables pH, [H O ], and the number of BC/Fe O membranes. 99.82% of degradation was obtained under optimized conditions using pH 5, 150 mg L of H O , and 11 composite membranes. Reaction kinetics followed a pseudo-first-order model, effectively reducing the organic matter (COD = 83.24% and BOD = 88.13%). The composite showed low iron leaching (1.60 ± 0.08 mg L ) and high stability. It was recovered and reused for 15 consecutive cycles, keeping the treatment efficiency at over 90%. As for the industrial wastewater, the photo-Fenton/sunlight/BC/Fe O system showed better results when combined with the physical-chemical coagulation/flocculation process previously used in the industry's WWTP. Together they reduced COD by 77.77%, also meeting the color standards (DFZ scale) for the wavelengths of 476 nm (
ISSN:1879-1298