請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/45863
標題: Characteristics of two types of stabilized nano zero-valent iron and transport in porous media
作者: Lin, Y.H.
魏銘彥
Tseng, H.H.
Wey, M.Y.
Lin, M.D.
林明德
關鍵字: Nano-scale zero-valent iron
PAA
CMC
Stabilized
Transport
nanoscale zerovalent iron
situ ftir-atr
carboxymethyl cellulose
fe-0
nanoparticles
infrared-spectroscopy
hexavalent chromium
ionic-strength
water
groundwater
reduction
期刊/報告no:: Science of the Total Environment, Volume 408, Issue 10, Page(s) 2260-2267.
摘要: Nano-scale zero-valent iron (NZVI) has been shown to be suitable for remediating contaminated aquifers. However, they usually aggregate rapidly and result in a very limited migration distance that inhibits their usefulness. This study employed poly acrylic acid (PAA) and carboxymethyl cellulose (CMC) to synthesize two types of stabilized styles of NZVI with finer sizes (namely PNZVI and CNZVI) The mobility of stabilized NZVI was also demonstrated on the basis of transport in porous media. The results show that the PNZVI has a uniform particle size of 12 nm. However, tens of CNZVI particles with diameters of 1-3 nm were packed into secondary particles Both the PNZVI and the CNZVI exhibited amorphous structures, and the stabilizer was bound to particle surfaces in the form of bidentate bridging via the carboxylic group, which could provide both electrostatic and steric repulsion to prevent particle aggregation. This study also proposes presumed stabilized configurations of PNZVI and CNZVI to reasonably illustrate their different dispersed suspension types. On the basis of the breakthrough curves and mass recovery, this study observed that the mobility of PNZVI in classic Ca(2+) concentration of groundwater was superior to CNZVI Nonetheless, the mobility of CNZVI would be decreased less significantly than PNZVI when encountering high Ca(2+) concentrations (40 mM) Presumably, increasing the pore flow velocity would enhance the mobility of stabilized NZVI Overall, the results of this study indicate that PNZVI has the potential to become an effective reactive material for in situ groundwater remediation (C) 2010 Elsevier B.V All rights reserved
URI: http://hdl.handle.net/11455/45863
ISSN: 0048-9697
文章連結: http://dx.doi.org/10.1016/j.scitotenv.2010.01.039
顯示於類別:環境工程學系所

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