Mobilization and deposition of iron nano and sub-micrometer particles in porous media: A glass micromodel study

Qiliang Wang, Jung Hyup Lee, Seung Woo Jeong, Am Jang, Sanghyup Lee, Heechul Choi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Mobilization and deposition of iron nano and sub-micrometer particles (INSMP) in a porous medium were investigated using a water-saturated glass micromodel. The deposition and detachment of INSMP in the micromodel were visualized by taking serial images and experimentally verified by analysis of breakthrough curves. This first visualization study of INSMP fate showed that there were dense aggregations at the pores as the concentration of INSMP increased. The presence of dissolved humic substances (>1. ppm) significantly reduced deposition of suspended particles and enhanced detachment of the deposited particles. The mobility of INSMP in the presence of Pahokee peat fulvic acid standard II (PPFA) was higher than for Pahokee peat humic acid standard I (PPHA) due to the presence of more aromatic groups and the molecular weight in PPFA. Interfacial energy estimation based on the DLVO theory revealed that the adsorption of humic substances onto the INSMP increased the energy barrier and reduced the depth of secondary minimum between particles. The " affinity transition" in the initial deposition of INSMP within the micromodel was observed in the presence of Pahokee peat humic substances.

Original languageEnglish
Pages (from-to)1466-1475
Number of pages10
JournalJournal of hazardous materials
Volume192
Issue number3
DOIs
Publication statusPublished - 2011 Sep 15

Keywords

  • DLVO theory
  • Glass micromodel
  • Humic substances
  • Iron nanoparticles
  • Mobilization-deposition

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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