Transport and retention of polymeric and other engineered nanoparticles in porous media.

Autor: Xin X; University of Florida, Institute of Food and Agricultural Sciences, Department of Soil and Water Science, Indian River Research and Education Center, Fort Pierce, FL 34945, USA., Judy JD; University of Florida-IFAS, Department of Soil and Water Sciences, Gainesville, FL 32611, USA., Zhao F; University of Florida, Institute of Food and Agricultural Sciences, Department of Soil and Water Science, Indian River Research and Education Center, Fort Pierce, FL 34945, USA; Environment and Plant Protection Institute, Chinese Academy of Tropical Agriculture Science, Haikou 571101, China., Goodrich SL; University of Florida, Department of Chemistry, Gainesville, FL 32611, USA., Sumerlin BS; University of Florida, Department of Chemistry, Gainesville, FL 32611, USA., Stoffella PJ; University of Florida, Institute of Food and Agricultural Sciences, Department of Soil and Water Science, Indian River Research and Education Center, Fort Pierce, FL 34945, USA., He Z; University of Florida, Institute of Food and Agricultural Sciences, Department of Soil and Water Science, Indian River Research and Education Center, Fort Pierce, FL 34945, USA. Electronic address: zhe@ufl.edu.
Jazyk: angličtina
Zdroj: NanoImpact [NanoImpact] 2021 Oct; Vol. 24, pp. 100361. Date of Electronic Publication: 2021 Nov 01.
DOI: 10.1016/j.impact.2021.100361
Abstrakt: Increasing applications of nanoparticles (NPs) in agriculture have raised potential risks to soil and aquatic ecosystems. A comparative study examining the transport of commonly used NPs in porous media is of critical significance for their application and regulation in agroecosystems. In this study, laboratory column leaching experiments were conducted to investigate the transport and retention of polysuccinimide NPs (PSI-NPs) in two saturated porous media with different grain sizes, as compared with multi-walled carbon nanotubes (MWCNTs), nano-Ag and nano-TiO 2 . Zeta potential of the NPs was negative at pH 6.3 and decreased in an order of PSI-NPs > nano-TiO 2  > MWCNTs > nano-Ag. The coarse and fine sands used in this study had negative charges with similar zeta potentials. The movement of NPs was affected by grain size, with larger sizes facilitating mobility while finer sizes favoring retention of NPs in the porous matrix. The retention profile significantly varied between the two sand columns, with more NPs transported to deeper layers in the coarse sand than the fine sand. The relative percentage of NPs detected in leachate was found to be positively correlated with the zeta potential of NPs (r = 0.931). Among the NPs, nano-Ag had the most negative zeta potential, and therefore was the most mobile, followed by MWCNTs and nano-TiO 2 . Having the least negative zeta potential, PSI-NPs had the lowest mobility, as compared with other NPs regardless of matrix grain size. This work reveals grain size and zeta potential of NPs are major factors that influence transport of NPs along the vertical porous profile, as well as demonstrating the relative unimportance of NP composition, which could serve as important guideline in nanomaterials application, risk assessment, and waste management in agroecosystems.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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