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Characteristics of Aggregate Size Distribution of Nanoscale Zero-Valent Iron in Aqueous Suspensions and Its Effect on Transport Process in Porous Media
Duan, Ruiqi1,2,3; Dong, Yanhui1,2,3; Zhang, Qian1,2,3
2018-06-01
Source PublicationWATER
ISSN2073-4441
Volume10Issue:6Pages:14
AbstractBare nanoscale zero-valent iron (NZVI) particles in aqueous suspensions aggregate into micron to submicron sizes. The transport process of enlarged aggregates or multi-sized aggregates is different from that of nanoparticles. In this work, we performed aggregate size distribution analysis of NZVI suspension using a laser grain size analyzer and conducted a series of continuous injection column experiments with different injected NZVI concentrations. The results show that aggregates in NZVI suspensions range from submicron to submillimeter size and are mainly distributed around 5-9 mu m and 50-100 mu m. Quantitative calculation of iron transport and retention showed that the retained iron linearly correlates with injected concentration. The cross-section images revealed that clogging weakened from inlet to outlet. Furthermore, larger aggregates (> 40 mu m) appeared more often in the rising-declining stages of breakthrough curves, whereas small aggregates (< 30 mu m) dominated the steady stage. Indeed, relatively preferential flow facilitated the transport and discharge of both large and small iron aggregates. Straining of glass beads especially for the large iron aggregates resulted in a decline in breakthrough. Moreover, the blocking of attached and plugged iron prevented later retention of iron, resulting in a certain concentration of iron in the effluents. Our study provides greater insight into the transport of NZVI.
KeywordNZVI aggregate size distribution multi-sized transport
DOI10.3390/w10060670
Funding OrganizationNatural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Natural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Natural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Natural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS KeywordNANOPARTICLES ; MOBILITY
Language英语
Funding ProjectNatural Science Foundation of Beijing[8162042] ; Natural Science Foundation of Beijing[8174077] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB10030601] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2016063]
Funding OrganizationNatural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Natural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Natural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Natural Science Foundation of Beijing ; Natural Science Foundation of Beijing ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS Research AreaWater Resources
WOS SubjectWater Resources
WOS IDWOS:000462219200001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90917
Collection页岩气与地质工程院重点实验室
Corresponding AuthorDong, Yanhui
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Duan, Ruiqi,Dong, Yanhui,Zhang, Qian. Characteristics of Aggregate Size Distribution of Nanoscale Zero-Valent Iron in Aqueous Suspensions and Its Effect on Transport Process in Porous Media[J]. WATER,2018,10(6):14.
APA Duan, Ruiqi,Dong, Yanhui,&Zhang, Qian.(2018).Characteristics of Aggregate Size Distribution of Nanoscale Zero-Valent Iron in Aqueous Suspensions and Its Effect on Transport Process in Porous Media.WATER,10(6),14.
MLA Duan, Ruiqi,et al."Characteristics of Aggregate Size Distribution of Nanoscale Zero-Valent Iron in Aqueous Suspensions and Its Effect on Transport Process in Porous Media".WATER 10.6(2018):14.
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