US EPA

5019646 

Journal Article 

The influence of humic substances on uranium biomineralization induced by Bacillus sp. dwc-2 

Tu, H; Lan, T; Yuan, G; Zhao, C; Liu, J; Li, F; Yang, J; Liao, J; Yang, Y; Wang, D; Liu, N 

2019 

Yes 

Journal of Environmental Radioactivity
ISSN: 0265-931X
EISSN: 1879-1700 

197 

23-29 

English 

30502659 

10.1016/j.jenvrad.2018.11.010 

WOS:000457663000004 

In this paper, the influence of humic acid (HA) and fulvic acid (FA) on biomineralization behaviour was evaluated. The results showed HA and FA did not obviously inhabit or promote the precipitation of U-phosphate minerals. The data from molecular dynamic simulation indicated that the free energy for the dissociation of uranyl the PO43- -uranyl was 202.49 kJ/mol, which was much larger than that form HA-uranyl (88.3 kJ/mol). These simulated results revealed the less competitiveness of HA and FA with PO43- for uranyl and explained why HA and FA had less impacted on the formation of U-phosphate minerals. However, the influence of HA/FA on the morphology was obvious, the microstructure of the bio-minerals changed from small particles to lamellar stacking structure with the addition of HA or FA. The findings of this study are helpful for us to gain a better understanding natural U-phosphate biomineralization behaviour.