DOI: 10.1016/j.watres.2018.09.047
Scopus记录号: 2-s2.0-85054084324
论文题名: Effects of Escherichia coli and phosphate on the transport of titanium dioxide nanoparticles in heterogeneous porous media
作者: Xu N. ; Cheng X. ; Wang D. ; Xu X. ; Huangfu X. ; Li Z.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 146 起始页码: 264
结束页码: 274
语种: 英语
英文关键词: Escherichia coli
; Iron oxide-coated sand
; Phosphate
; Soil transport
; Titanium dioxide nanoparticles (nTiO2)
英文摘要: Transport behaviors of titanium dioxide nanoparticles (nTiO2) were examined in the individual- and co-presence Escherichia (E.) coli and phosphate in heterogeneous sand (uncoated and iron oxyhydroxide-coated sand) columns. The results showed that for the individual presence of phosphate, the degree of nTiO2 deposition was less in uncoated than in iron oxide-coated sands. In contrast, an opposite trend that greater deposition of nTiO2 in uncoated than in coated sands occurred in the individual presence of E. coli. These observations are due to the phosphate adsorption changing the charge of NPs and iron oxyhydroxide-coated sand, or the preferential adhesion of bacterial to coated sand. In the copresence of E. coli and phosphate, interestingly, the phosphate level plays an important role in influencing nTiO2 transport. At a high phosphate concentration (>1.0 mM), the deposition of nTiO2 with the individual presence of E. coli was stronger than nTiO2 in the copresence of both E. coli and phosphate, regardless of sand type. The potential mechanism was that phosphate adsorption led to the formation of more negatively charged NPs-bacteria complexes that have higher mobility in sand columns. At a low phosphate level (≤0.1 mM), a similar observation occurred in uncoated sand. Nevertheless, the deposition of nTiO2 with copresence of E. coli and phosphate was greater than nTiO2 with E. coli in oxyhydroxide-coated sand. It was attributed to the formation of large NPs-bacteria-phosphate clusters (less mobile) and the preferential adhesion of E. coli cells to iron oxyhydroxide coating simultaneously. Taken together, our findings provide crucial knowledge for better understanding the fate, transport, and potential risks of engineered nanoparticles in complicated environmental settings where bacteria and phosphate are ubiquitous. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112389
Appears in Collections: 气候减缓与适应
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作者单位: Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China; National Research Council Resident Research Associate, U.S. Environmental Protection Agency, Ada, OK 74820, United States
Recommended Citation:
Xu N.,Cheng X.,Wang D.,et al. Effects of Escherichia coli and phosphate on the transport of titanium dioxide nanoparticles in heterogeneous porous media[J]. Water Research,2018-01-01,146