Biotechnological recovery of uranium (VI) from Abu Zeneima spent ore residue using green lixiviant

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Abstract

Promising green leaching technique was used by Humic acid (HA) for removing uranium from Abu Zeneima spent residue for environmental safety and cost-effective leaching. The studied residue is outlet from vat leaching process using sulfuric acid leaching of carbonaceous shale ore material with initial uranium assays 185 ppm, which representing a hazardous waste. The overall leaching efficiency assaying 93% of uranium using humic acid leaching at curing temperature 70 °C, 13% HA with S/L ratio of 1/1.5 for 15 day. Kinetic study of leaching process proved diffusion controlling mechanism with activated energy 10.297 kJ/mol. Finally; 98% of uranium was extracted using Amberlite IRA- 400 resin with purity of 97.3%.

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Humic acids: Structural properties and multiple functionalities for novel technological developments.

Maria Santana, Bruna de Melo, Fernanda Lopes Motta (2016)

Humic acids (HAs) are macromolecules that comprise humic substances (HS), which are organic matter distributed in terrestrial soil, natural water, and sediment. HAs differ from the other HS fractions (fulvic acid and humins) in that they are soluble in alkaline media, partially soluble in water, and insoluble in acidic media. Due to their amphiphilic character, HAs form micelle-like structures in neutral to acidic conditions, which are useful in agriculture, pollution remediation, medicine and pharmaceuticals. HAs have undefined compositions that vary according to the origin, process of obtainment, and functional groups present in their structures, such as quinones, phenols, and carboxylic acids. Quinones are responsible for the formation of reactive oxygen species (ROS) in HAs, which are useful for wound healing and have fungicidal/bactericidal properties. Phenols and carboxylic acids deprotonate in neutral and alkaline media and are responsible for various other functions, such as the antioxidant and anti-inflammatory properties of HAs. In particular, the presence of phenolic groups in HAs provides antioxidant properties due to their free radical scavenging capacity. This paper describes the main multifunctionalities of HAs associated with their structures and properties, focusing on human health applications, and we note perspectives that may lead to novel technological developments. To the best of our knowledge, this is the first review to address this topic from this approach.

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Author and article information

Journal

Title: Journal of Radioanalytical and Nuclear Chemistry

Abbreviated Title: J Radioanal Nucl Chem

Publisher: Springer Science and Business Media LLC

ISSN (Print): 0236-5731

ISSN (Electronic): 1588-2780

Publication date Created: June 2022

Publication date (Electronic): April 18 2022

Publication date (Print): June 2022

Volume: 331

Issue: 6

Pages: 2503-2513

Article

DOI: 10.1007/s10967-022-08249-6

SO-VID: 204547f9-7ccf-4f42-a2a6-74a91cbde80f

License:

https://creativecommons.org/licenses/by/4.0

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