AI Article Synopsis
- The study examines how copper ions improve the oxidation of lignosulfonates using hydrogen peroxide (HO) in alkaline conditions, significantly increasing conversion efficiency by reducing partial oxidation.
- Copper ions interact with lignosulfonates to form complexes that enhance the generation of hydroxyl radicals and facilitate redox cycling, countering the negative effects of sulfonic groups.
- The research offers new insights into oxidative degradation mechanisms, presenting a simplified method that could be beneficial for industrial applications, particularly in processing woody biomass for valuable products.
Article Abstract
This study investigates the dual role of copper ions in catalysis and complexation during the oxidation of lignosulfonates with hydrogen peroxide (HO) under alkaline conditions. The presence of copper ions reduces partial oxidation by 86 % compared to HO treatment alone, enhancing overall conversion efficiency to 63 % under increased oxidative conditions. Analyses reveal that copper-lignosulfonate complexes facilitate redox cycling and hydroxyl radical generation through interactions with HO, confirming copper's dual functions. This mechanism mitigates the hindrance of sulfonic groups on hydroperoxide anions, leading to lignosulfonate degradation into dicarboxylic acids. These findings provide novel insights into the copper-lignosulfonate/HO system, expanding the understanding of oxidative degradation mechanisms beyond traditional Fenton-like reactions. Furthermore, this system offers a simplified and efficient alternative for industrial applications, particularly in integration with the sulfite pretreatment process of woody biomass for producing valuable co-products.
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| http://dx.doi.org/10.1016/j.biortech.2024.131729 | DOI Listing |
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