ChemInform Abstract: Bio‐Derived Materials as a Green Route for Precious &amp; Critical Metal Recovery and Re‐Use

Dodson, Jennifer R.; Parker, Helen L.; García, Andrea Muñoz; Hicken, Alexandra; Asemave, Kaana; Farmer, Thomas J.; He, He; Clark, James H.; Hunt, Andrew J.

doi:10.1002/chin.201523295

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“…Activated carbons are one such group of adsorbent materials that frequently exhibit excellent adsorption capacities and some selectivity [14]. Typically such materials are highly microporous, hence can suffer from diffusion limitations [15]. This is especially problematic when adsorbing bulkier molecules such as dyes.…”

Section: Introductionmentioning

confidence: 99%

“…Mesoporous carbonaceous polysaccharide-based materials could be used to overcome such limitations and have some positive green credentials; however, production of such materials is laborious, resource intensive and costly [17,18]. By contrast, silicas typically exhibit low adsorption capacities but are mechanically stable, widely available, low cost and can possess hierarchical pore structures [15,19,20]. Combining the beneficial properties of carbons and silica would be advantageous for adsorption materials.…”

Section: Introductionmentioning

confidence: 99%

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Graphitic mesoporous carbon-silica composites from low-value sugarcane by-products for the removal of toxic dyes from wastewaters

et al. 2020

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Highly porous carbon-silica composites (CSC) were prepared for the first time through a simple wet impregnation process and subsequent pyrolysis of low-value sugarcane by-products, namely molasses. These CSC materials demonstrate a distinct range of functionalities, which significantly differ from similar materials published in the literature. Importantly, the carbon-silica composites prepared at 800°C exhibited exceptional adsorption capacities for the azo-dye congo red (445 mg g −1 ), due to the graphitic carbon coating and unique functionality including C-O-C within the porous structure. Congo red adsorption capacity of the highly mesoporous graphitic carbon-silica composites significantly exceeds that of commercial activated carbon and silica, these carbon-silica composites therefore represent an effective step towards the development of porous bio-derived adsorbent for remediation of dye wastewaters. Both the porous properties (surface area and pore size distribution) and the functionality of the carbon coating were dependent on the temperature of preparation. The sustainable synthetic methods employed led to a versatile material that inherited the mesoporosity characteristics from the parent silica, demonstrating mesoporous volumes greater than 90% (as calculated from the total pore volume). Adsorption on the 800°C prepared carbon-silica composites demonstrated an excellent fit with the Langmuir isotherm and the pseudo-first-order kinetic model.

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Section: Introductionmentioning

confidence: 99%