Biotransformation of lanthanum by Aspergillus niger.

摘要: Lanthanum is an important rare earth element and has many applications in modern electronics catalyst manufacturing. However, there exist several obstacles the recovery cycling of this due to a low average grade exploitable deposits rates by energy-intensive extraction procedures. In work, novel method transform recover La been proposed using geoactive properties Aspergillus niger. La-containing crystals were formed collected after A. niger was grown on Czapek-Dox agar medium amended with LaCl3. Energy-dispersive X-ray analysis (EDXA) showed contained C, O, La; scanning electron microscopy revealed that tabular structure terraced surfaces. diffraction identified mineral phase sample as La2(C2O4)3·10H2O. Thermogravimetric transformed oxalate into La2O3 kinetics thermal decomposition corresponding well theoretical calculations. Geochemical modelling further confirmed lanthanum decahydrate optimal conditions for their precipitation. To quantify crystal production, biomass-free fungal culture supernatants used precipitate La. The results precipitated achieved yields when concentration above 15 mM 100% removed from system at 5 mM Our findings provide new aspect biotransformation biorecovery elements solution systems.