Degradation of trichloroethylene (TCE) by nanoscale zero-valent iron (nZVI) immobilized in alginate bead

被引:167
|
作者
Kim, Hojeong [1 ]
Hong, Hye-Jin [2 ]
Jung, Juri [2 ]
Kim, Seong-Hye [2 ]
Yang, Ji-Won [2 ]
机构
[1] Korea Environm Inst, Div Water & Environm, Seoul, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Taejon 305701, South Korea
关键词
Immobilization; Iron nanoparticle; Reductive dechlorination; Trichloroethylene; Zero-valent iron; ENVIRONMENTAL REMEDIATION; NANOPARTICLES; DECHLORINATION; PARTICLES; GROUNDWATER; ARSENIC(III); REDUCTION; PATHWAYS; KINETICS; REMOVAL;
D O I
10.1016/j.jhazmat.2009.11.145
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nowadays, many researchers have studied the environmental application of the nanoscale zero-valent iron (nZVI) and several field applications for the groundwater remediation have been reported. Still, there are many concerns on the fate and transport of the nZVI and the corresponding risks. To avoid such concerns. it was investigated to immobilize nZVI in a support and then it was applied to degrade trichloroethylene (TCE). The nZVI and palladium-doped nZVI (Fe(0)- and Fe/Pd-alginate) were immobilized in the alginate bead where ferric and barium ions are used as the cross-linking cations of the bead. According to TEM (transmission electron microscopy), the size of the immobilized ZVI was as small as a few nanometers. From the surface analysis of the Fe/Pd-alginate, it is found that the immobilized nZVI has the core-shell structure. The core is composed of single crystal Fe-0, while most of irons on the surface are oxidized to Fe3+. When 50 g/L of Fe/Pd-alginate (3.7 g Fe/L) was introduced to the aqueous solution, >99.8% of TCE was removed and the release of metal from the support was <3% of the loaded iron. The removal of TCE by Fe/Pd-alginate followed pseudo-first-order kinetics. The observed pseudo-first-order reaction constant (k(obs)) of Fe/Pd-alginate was 6.11 h(-1) and the mass normalized rate constant (km) was 1.6 Lh(-1) g(-1). The k(m) is the same order of magnitude with that of iron nanoparticles. In conclusion, it is considered that Fe/Pd-alginate can be used efficiently in the treatment of chlorinated solvent. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:1038 / 1043
页数:6
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