ArticleMicrobial biotechnology2022
Rock phosphate solubilization by abiotic and fungal-produced oxalic acid: reaction parameters and bioleaching potential.
Article in Microbial biotechnology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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9 citing papers in PubMed, 26 citations in OpenAlex.
- Fermentation-based oxalic acid production aimed at sustainable critical metal recovery from electronic waste.Applied microbiology and biotechnology · 2026Article
- A sustainable pH responsive hydrogel-based phosphorus fertilizer using nano oxalic acid-modified rock phosphate and humic acid.RSC advances · 2026Article
- Integrating 2D nanomaterials with organic acid-mediated rock phosphate solubilization for enhanced phosphorus availability: a review.RSC advances · 2026Review
- "Synthesis and characterization of mesoporous V-Mo-MCM-41 nanocatalysts: Enhancing efficiency in oxalic acid synthesis".Heliyon · 2024Article
- (Poly)phosphate biotechnology: Envisaged contributions to a sustainable P future.Microbial biotechnology · 2023Article
- Synthesis and characterization of rod-like amino acids/nanohydroxyapatite composites to inhibit osteosarcoma.RSC advances · 2022Article
- Rock phosphate solubilization by abiotic and fungal-produced oxalic acid: reaction parameters and bioleaching potential.Microbial biotechnology · 2022Article
- Article
- Solubilization of struvite and biorecovery of cerium by Aspergillus niger.Applied microbiology and biotechnology · 2022Article
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Authors and funding
4 authors at 1 institution in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Oxalic acid-producing fungi play an important role in biogeochemical transformations of rocks and minerals and possess biotechnological potential for extraction of valuable elements from primary or waste ores and other solid matrices. This research investigates the extraction of phosphate from rock phosphate (RP) by oxalic acid. Reaction parameters were derived using pure oxalic acid solutions to solubilize RP. It was found that the oxalic acid concentration was the main factor driving reaction kinetics. Excess oxalic acid could retard the reaction due to calcium oxalate encrustation on RP surfaces. However, complete P extraction was reached at stoichiometric proportions of apatite and oxalic acid. This reaction reached completion after 168 h, although most of the P (up to 75%) was released in less than 1 h. Most of the Ca released from the apatite formed sparingly soluble calcium oxalate minerals, with a predominance of whewellite over weddellite. Bioleaching of RP employing biomass-free spent culture filtrates containing oxalic acid (100 mM) produced by Aspergillus niger extracted ~ 74% of the P contained in the RP. These findings contribute to a better understanding of the reaction between apatite and oxalic acid and provide insights for potential applications of this process for biotechnological production of phosphate fertilizer.
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