Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202200498
Keywords
heavy metal removal; interstitial B; lattice strain; microscale zero-valent iron; ton-scale manufacture
Categories
Funding
- National Key Research and Development Program of China [2018YFC1800701]
- National Natural Science Foundation of China [U20A20129, 21876058, 21936003, 21872061, 21976066, 21906126]
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Strained-mZVI, achieved through boron doping to exert tensile strain on microscale zero-valent iron (mZVI), exhibits excellent performance in removing heavy metals and shows great potential in remediation of heavy metal-contaminated water and soil.
Microscale zero-valent iron is one of the most important multifunctional environmental remediation materials, yet its passivated iron oxide shell hampers the transportation of inherent electrons. Herein, the authors exert tensile strain onto mZVI by interstitial boron doping that destabilizes lattice Fe-Fe interactions, thereby liberating the electrons trapped in the iron reservoir. Tensile strain also upshifts the equilibrated Fermi level at the iron/iron oxide Ohmic heterojunction, thus populating the oxide shell with abundant electrons for robust heavy metal sequestration. Strained-mZVI exhibits a 62 times faster Cr(VI) removal rate than its unstrained counterpart and can successfully treat industrial wastewater such as landfill leachate, electroplating, and chromium effluents. The excellent property and exceedingly low cost ($2000 ton(-1)) of strained-mZVI results in its great potential to remediate heavy metal-contaminated water and soil.
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