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Facile and clean separation of Pb(II) from soil and recycling by pH-triggered microbial technology
- Source :
- Chemical Engineering Journal. 424:130394
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Developing an efficient method to recover and reuse soil-base lead (Pb) poses significant challenges. Herein, we designed a remediation method to achieve the dual goal of separating and reusing Pb from soil based on Bacillus megaterium-secreted surfactin with pH-response. Under weakly alkaline, B. megaterium-secreted surfactin efficiently captured Pb(II) from soil and also converted it into biological Pb/PbO nanoparticles (bio-Pb/PbO NPs). Further, surfactin’s sensitivity to pH enables bio-Pb/PbO NPs to be readily separated from the soil through simple pH adjustments. The highest yield of bio-Pb/PbO NPs (77.54%) was achieved at an initial concentration of 1 mg/g Pb(II). The recovered bio-Pb/PbO NPs showed a mesoporous structure and an average size of ~47 nm. More importantly, bio-Pb/PbO NPs exhibited highly efficient catalytic activity for the hydrogen evolution reaction in 1 M KOH. These results demonstrated that this method efficiently recovered and converted Pb into high value-added NPs, and was thereby a sustainable and feasible technique for Pb(II) recovery and reuse. As such, this methodology offers a new, efficient, and practical approach for sustainable remediation of heavy metal contamination in soils.
- Subjects :
- Environmental remediation
General Chemical Engineering
Nanoparticle
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Industrial and Manufacturing Engineering
0104 chemical sciences
Catalysis
chemistry.chemical_compound
chemistry
Yield (chemistry)
Soil water
Ph triggered
Environmental Chemistry
0210 nano-technology
Surfactin
Mesoporous material
Nuclear chemistry
Subjects
Details
- ISSN :
- 13858947
- Volume :
- 424
- Database :
- OpenAIRE
- Journal :
- Chemical Engineering Journal
- Accession number :
- edsair.doi...........5b241fe1f76331542ee3b6155f4cc76e