Exploring the effects of nanoscale zero-valent iron (nZVI) on the mechanical properties of lead-contaminated clay

Chen, Yong-Zhan1,2; Zhou, Wan-Huan1,2; Liu, Fuming3,4,5; Yi, Shuping4,5

2019-10

10.1139/cgj-2018-0387

CANADIAN GEOTECHNICAL JOURNAL   影响因子和分区

0008-3674

1208-6010

Nanoscale zero-valent iron (nZVI) is a well-known efficient nanomaterial for the immobilization of heavy metals and has been widely applied in the remediation of contaminated groundwater and soils. In this study, a series of field emission scanning electron microscopy (FESEM) analyses, vane shear tests, triaxial compression tests, and oedometer tests was conducted on lead-contaminated clay using four dosages of nZVI treatment (0.2%, 1%, 5%, and 10%). The geotechnical properties, including basic index properties, stiffness, shear strength, and compressibility, were assessed after the reaction procedure. FESEM analysis was performed to explore the potential mechanisms of nZVI treatment in terms of morphological characteristics. It was found that the plasticity index decreased gradually with increasing nZVI dosage. Treating contaminated soil with nZVI caused an increase in the vane shear strength, stiffness, and friction angle. The compression index increased gradually because of the nZVI treatment. Based on the FESEM analysis, a conclusion can be deduced that larger aggregates and conjoined structures resulting from nZVI treatment can lead to the strengthening of lead-contaminated clay.

nanoscale zero-valent iron lead-contaminated clay strength enhancement mechanical properties compressibility

SCI ; EI

英语

其他

University of Macau Research Fund[MYRG2017-00198-FST]

Engineering ; Geology

Engineering, Geological ; Geosciences, Multidisciplinary

WOS:000488768000003

CANADIAN SCIENCE PUBLISHING

20194107504995

Compressibility ; Compression testing ; Contamination ; Field emission microscopes ; Groundwater ; Groundwater pollution ; Heavy metals ; Iron ; Mechanical properties ; Nanotechnology ; Remediation ; Scanning electron microscopy ; Shear strength ; Soil mechanics ; Soil testing ; Stiffness

Groundwater:444.2 ; Environmental Impact and Protection:454.2 ; Soils and Soil Mechanics:483.1 ; Metallurgy and Metallography:531 ; Iron:545.1 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Materials Science:951

ENGINEERING

Web of Science

1.Univ Macau, State Key Lab Internet Things Smart City, Taipa, Macau Sar, Peoples R China
2.Univ Macau, Dept Civil & Environm Engn, Taipa, Macau Sar, Peoples R China
3.Univ Macau, Fac Sci & Technol, Dept Civil & Environm Engn, Taipa, Macau Sar, Peoples R China
4.Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen, Peoples R China
5.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen, Peoples R China

Chen, Yong-Zhan,Zhou, Wan-Huan,Liu, Fuming,et al. Exploring the effects of nanoscale zero-valent iron (nZVI) on the mechanical properties of lead-contaminated clay[J]. CANADIAN GEOTECHNICAL JOURNAL,2019,56(10):1395-1405.

Chen, Yong-Zhan,Zhou, Wan-Huan,Liu, Fuming,&Yi, Shuping.(2019).Exploring the effects of nanoscale zero-valent iron (nZVI) on the mechanical properties of lead-contaminated clay.CANADIAN GEOTECHNICAL JOURNAL,56(10),1395-1405.

Chen, Yong-Zhan,et al."Exploring the effects of nanoscale zero-valent iron (nZVI) on the mechanical properties of lead-contaminated clay".CANADIAN GEOTECHNICAL JOURNAL 56.10(2019):1395-1405.