Synergistic effects of paper mill sludge and sulfonated graphene catalyst for maximizing bio-hydrogen harvesting from sugarcane bagasse de-polymerization

Bibliographic Information
Authors: Tawfik A.; M.Azzam A.; El-Dissouky A.; Ibrahim A.Y.; Nasr M.
Journal: Journal of Environmental Management
Publisher: Academic Press
Publication Date: January 2023
Volume / Issue: Volume 326
Article No.: 116724
ISSN: 3014797
DOI: 10.1016/j.jenvman.2022.116724
Scopus: View on Scopus
PubMed: 36372032
Document Type: Article
Authors and Affiliations
Tawfik A., National Research Centre, Water Pollution Research Dept., Dokki, Cairo, 12622, Egypt; M.Azzam A., Environmental Research Department, Theodor Bilharz Research Institute (TBRI), Imbaba, P.O. Box 30, Giza, No. 12411, Egypt; El-Dissouky A., Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt; Ibrahim A.Y., Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt; Nasr M., Sanitary Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, 21544, Egypt
Abstract
In this study, hydrogen harvesting from fermentation of sugarcane bagasse (SCB) was promoted by maintaining synergism between sulfonated graphene (SGR) catalyst and paper mill sludge (PMS). The sulfonic acid (–SO3H) groups in the catalyst played a major role in destructing the β-1,4 glycosidic bonds of sugarcane bagasse, releasing readily biodegradable sugars into the fermentation medium. The cellulose, hemicellulose, and lignin conversion efficiency were improved by 127.5%, 495.0%, and 109.2%, respectively with 20 mgSGR/gVS catalyst addition, compared with the control samples. These values were also higher than those obtained by non-sulfonated graphene catalyst. The hydrogenation of sugarcane bagasse was maximized at a sulfonated graphene catalyst dosage of 60 mgSGR/gVS, providing the highest hydrogen harvesting of 4104 ± 321 mL. This was associated with an increase of the Proteobacteria phyla up to 52.0%, Firmicutes phyla to 13.9%, and Acinetobacter sp. to 39.8% compared with only 37.0%, 11.3% and 11.1% in the control assay respectively. Moreover, sulfonated graphene catalyst supplementation promoted the acetate fermentation reaction pathway by increasing the acetate/butyrate ratio up to 4.1. Nevertheless, elevating the catalyst dosage up to 120 mgSGR/gVS reduced the hydrogen harvesting (1190 ± 92 mL) due to the release of furfural (1.76 ± 0.02 g/L) in the fermentation cultures, deteriorating the microbes’ internal composition and metabolism bioactivities. Finally maximizing the hydrogen productivity from sugarcane bagasse is feasible by incorporation of paper mill sludge and sulfonated graphene catalyst at dosage not exceeding 60 mgSGR/gVS. However, investigating the recyclability and disposal of digestate containing sulfonated graphene catalyst and the associated economic feasibility needs more attention in the future. © 2022 Elsevier Ltd
Keywords
Acidic nano-catalyst; Lignocellulosic waste; Microbial activities; Molecular docking; Solid state fermentation; Cellulose; Fermentation; Graphite; Hydrogen; Hydrolysis; Polymerization; Saccharum; Sewage; acetic acid; bagasse; butyric acid; carbohydrate; furfural; graphene; hemicellulose; lignin; sulfurous acid; catalyst; microbial activity; mill; sludge; sugar cane; acetic acid fermentation; Acinetobacter; Article; bacterium culture; depolymerization; feasibility study; Firmicutes; hydrogenation; nanocatalyst; nonhuman; paper mill; Proteobacteria; reaction analysis; sugarcane; sulfonation; synergistic effect; chemistry
Citation Information
Scopus Citations: 13
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