Unveiling the biointerfaces characteristics and removal pathways of Cr(â
¥) in Bacillus cereus FNXJ1-2-3 for the Cr(â
¥)-to-Cr(0) conversion.
Environ Res
; 251(Pt 2): 118663, 2024 Jun 15.
Article
in En
| MEDLINE
| ID: mdl-38460667
ABSTRACT
Although less toxic than hexavalent chromium, Cr (â
¢) species still pose a threat to human health. The Cr (â
¥) should be converted to Cr (0) instead of Cr (â
¢), which is still involved in biological detoxification filed. Herein, for the first time, it was found that Cr(â
¥) can be reduced into Cr(0) by Bacillus cereus FNXJ1-2-3, a way to completely harmless treatment of Cr(â
¥). The bacterial strain exhibited excellent performance in the reduction, sorption, and accumulation of Cr(â
¥) and Cr (â
¢). XPS etching characterization inferred that the transformation of Cr(â
¥) into Cr(0) followed a reduction pathway of Cr(â
¥)âCr (â
¢)âmetallic Cr(0), in which at least two secretory chromium reductases (ECrâ
¥ââ
¢ and ECrâ
¢â0) worked. Under the optimum condition, the yield ratio of Cr(0)/Cr (â
¢) reached 33.90%. In addition, the interfacial interactions, ion channels, chromium reductases, and external electron donors also contributed to the Cr(â
¥)/Cr(0) transformation. Findings of this study indicate that Bacillus cereus FNXJ1-2-3 is a promising bioremediation agent for Cr(â
¥) pollution control.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Bacillus cereus
/
Biodegradation, Environmental
/
Chromium
Language:
En
Journal:
Environ Res
Year:
2024
Type:
Article
Affiliation country:
China