Wang, Qiliang Lee, Jung-Hyup Jeong, Seung-Woo Jang, Am Lee, Sanghyup Choi, Heechul 2024-01-20T16:30:16Z 2024-01-20T16:30:16Z 2021-09-05 2011-09-15 0304-3894 https://pubs.kist.re.kr/handle/201004/129981 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. (C) 2011 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV NANOSCALE ZEROVALENT IRON ZERO-VALENT IRON NATURAL ORGANIC-MATTER MODIFIED FE-0 NANOPARTICLES TRANSPORT CHARACTERISTICS METALLIC IRON SAND COLUMNS REMEDIATION MOBILITY WATER Mobilization and deposition of iron nano and sub-micrometer particles in porous media: A glass micromodel study Article 10.1016/j.jhazmat.2011.06.066 1 JOURNAL OF HAZARDOUS MATERIALS, v.192, no.3, pp.1466 - 1475 JOURNAL OF HAZARDOUS MATERIALS 192 3 1466 1475 scie scopus 000295236800069 2-s2.0-80052037678 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article NANOSCALE ZEROVALENT IRON ZERO-VALENT IRON NATURAL ORGANIC-MATTER MODIFIED FE-0 NANOPARTICLES TRANSPORT CHARACTERISTICS METALLIC IRON SAND COLUMNS REMEDIATION MOBILITY WATER Iron nanoparticles Glass micromodel Mobilization-deposition Humic substances DLVO theory