Environmental Engineering Reference
In-Depth Information
4
Reduction of Priority Pollutants by Nanoscale
Zerovalen
t Iron in Subsurface Environments
Chun-Chi Lee,
1
Hsing-Lung Lien,
2
Shan-Chee Wu,
3
Ruey-An Doong,
1
and Chih-Cheng Chao
4
1
Department of Biomedical Engineering and Environmental Sciences,
National Tsing Hua University, Hsinchu, Taiwan
2
Department of Civil and Environmental Engineering,
National University of Kaohsiung, Kaohsiung, Taiwan
3
Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan
4
Department of Chemical and Materials Engineering, Tunghai University, Taichung, Taiwan
CONTENTS
4.1 Introduction .......................................................................................................................... 64
4.2 Preparation and Characterization of nZVI ...................................................................... 65
4.3 Core-Shell Structure of Iron Nanoparticles .................................................................... 67
4.4 Effect of Environmental Parameters on the Reactivity of nZVI ................................... 68
4.4.1 Particle Size of nZVI ................................................................................................ 68
4.4.2 pH Values .................................................................................................................. 69
4.4.3 Transition Metal Ions............................................................................................... 70
4.4.4 Effect of Natural Organic Matters ......................................................................... 71
4.5 Bimetallic Iron System ........................................................................................................ 72
4.5.1 Synthesis of Bimetallic System ............................................................................... 72
4.5.2 Reduction of Pollutants by Bimetallic Systems ................................................... 74
4.5.3 Optimal Mass Loading ........................................................................................... 75
4.6 Reduction of Priority Pollutants by nZVI......................................................................... 75
4.6.1 Dechlorination of Chlorinated Compounds ........................................................ 75
4.6.2 Reduction of Nitrate ................................................................................................ 78
4.6.3 Reduction of Bromate and Perchlorate ................................................................. 79
4.6.4 Removal of Heavy Metals ....................................................................................... 80
4.7 Stability and Mobility of Nanoscale Iron Particles ......................................................... 82
4.8 Status of Field Application in the United States, Europe, and Taiwan ........................ 85
4.9 Conclusion Remarks ............................................................................................................ 87
Acknowledgment .......................................................................................................................... 88
References ....................................................................................................................................... 88
63
