Microstructure and morphological characterization of lead-contaminated clay with nanoscale zero-valent iron (nZVI) treatment

Chen, Yong-Zhan1,2; Zhou, Wan-Huan1,2; Liu, Fuming1,2,3,4; Yi, Shuping3; Geng, Xueyu5

2019-06-05

10.1016/j.enggeo.2019.05.001

ENGINEERING GEOLOGY   影响因子和分区

0013-7952

1872-6917

The increasing use of nanoscale zero-valent iron (nZVI) for soil and groundwater remediation has raised concerns about its potential effect on soil properties. Numerous laboratory and field studies have demonstrated its excellent capability to immobilize contaminants and enhance contaminated soil. However, a few studies have shed light on the changes in the microstructure and morphology of the soil due to nZVI treatment. This study explores the variation in particle morphology and microstructure in nZVI-treated soil. A series of microscale experiments, including field emission scanning electron microscopy (FESEM), particle size analysis, mercury injection porosimetry (MIP), optical microscopic analysis, and particle shape tests, were conducted on nZVI-treated samples. The dosages of nZVI used were 0%, 0.2%, 1%, 5%, and 10% of the contaminated soil. Morphological characterization suggested that the addition of nZVI resulted in the occurrence of larger-sized particles, on-particle branched structures, finer pore size distribution, aggregation, and a flocculent network in the soil structure. The aggregated and bonded soil particles via nZVI could be one of the mechanisms for its variation in geotechnical characteristics. The findings of this study may improve our understanding of soil improvement using nZVI treatment.

Nanoscale zero-valent iron Clay Microstructure Aggregation Morphology

SCI ; EI

英语

其他

Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, China[2017B030301012]

Engineering ; Geology

Engineering, Geological ; Geosciences, Multidisciplinary

WOS:000472690300006

ELSEVIER SCIENCE BV

20192006934519

Agglomeration ; Clay ; Contamination ; Field emission microscopes ; Groundwater ; Iron ; Microstructure ; Morphology ; Nanotechnology ; Particle size ; Pore size ; Remediation ; Scanning electron microscopy ; Soil pollution ; Soil testing ; Soils

Groundwater:444.2 ; Environmental Impact and Protection:454.2 ; Soils and Soil Mechanics:483.1 ; Iron:545.1 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Chemical Operations:802.3 ; Materials Science:951

GEOSCIENCES

Web of Science

1.Univ Macau, State Key Lab Internet Things Smart City, Macau, Peoples R China
2.Univ Macau, Dept Civil & Environm Engn, Macau, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen, Peoples R China
4.Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen, Peoples R China
5.Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England

Chen, Yong-Zhan,Zhou, Wan-Huan,Liu, Fuming,et al. Microstructure and morphological characterization of lead-contaminated clay with nanoscale zero-valent iron (nZVI) treatment[J]. ENGINEERING GEOLOGY,2019,256:84-92.

Chen, Yong-Zhan,Zhou, Wan-Huan,Liu, Fuming,Yi, Shuping,&Geng, Xueyu.(2019).Microstructure and morphological characterization of lead-contaminated clay with nanoscale zero-valent iron (nZVI) treatment.ENGINEERING GEOLOGY,256,84-92.

Chen, Yong-Zhan,et al."Microstructure and morphological characterization of lead-contaminated clay with nanoscale zero-valent iron (nZVI) treatment".ENGINEERING GEOLOGY 256(2019):84-92.