期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 13, 期 12, 页码 6673-6681出版社
SPRINGER
DOI: 10.1007/s11051-011-0574-x
关键词
Nanoscale zero-valent iron (NZVI); Encapsulated NZVI; Trichloroethylene (TCE); Calcium-alginate; Biopolymer; Environmental remediation
资金
- USGS/North Dakota Water Resources Research Institute (NDWRRI)
Nanoscale zero-valent iron (NZVI) particles (10-90 nm) were encapsulated in biodegradable calcium-alginate capsules for the first time for application in environmental remediation. Encapsulation is expected to offers distinct advances over entrapment. Trichloroethylene (TCE) degradation was 89-91% in 2 h, and the reaction followed pseudo first order kinetics for encapsulated NZVI systems with an observed reaction rate constant (k (obs)) of 1.92-3.23 x 10(-2) min(-1) and a surface normalized reaction rate constant (k (sa)) of 1.02-1.72 x 10(-3) L m(-2) min(-1). TCE degradation reaction rates for encapsulated and bare NZVI were similar indicating no adverse affects of encapsulation on degradation kinetics. The shelf-life of encapsulated NZVI was found to be four months with little decrease in TCE removal efficiency.
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