Special Issue "Transport and Cotransport of Colloids, Nanomaterials, PFAS, and Plastics in Porous Media"

A special issue of Toxics (ISSN 2305-6304). This special issue belongs to the section "Environmental Chemistry".

Deadline for manuscript submissions: 30 September 2022 | Viewed by 631

Special Issue Editors

Dr. Jianzhou He
E-Mail Website
Guest Editor
Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ 85721, USA
Interests: fate and transport; colloids and nanoparticles; environmental nanotechnology; PFAS remediation; soil chemistry and physics
Dr. Dengjun Wang
E-Mail Website
Guest Editor
School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA
Interests: transport; transformation; remediation of nutrients and contaminants
Special Issues, Collections and Topics in MDPI journals
Dr. Chunming Su
E-Mail Website
Guest Editor
Groundwater Characterization and Remediation Division, Center for Environmental Solutions and Emergency Response, Office of Research and Development, U. S. Environmental Protection Agency, Ada, OK, USA
Interests: environmental chemistry; fate and transport; nanomaterials; groundwater and soil remediation

Special Issue Information

Dear Colleagues,

The growing production and utilization of nanomaterials, plastics, and per- and polyfluoroalkyl substances (PFAS) has generated emerging contaminants in the environment, potentially posing a long-lasting threat to wildlife and human health. In the subsurface, these emerging contaminants can interact with each other, conventional contaminants, and other environmental components such as colloids and natural organic matter. The development of remedial technologies requires a fundamental understanding of their fate and (co)transport mechanisms in the subsurface. This Special Issue calls for research articles, reviews, analyses, short communications, and viewpoints on related topics. Topics include but are not limited to the: (1) characterization of the interactions of colloids, nanomaterials, PFAS, and plastics with coexisting contaminants and surrounding environmental media; (2) fate, (co)transport, monitoring, and control of colloids, nanomaterials, PFAS, and plastics in the subsurface; (3) development of predictive tools and mathematical models based on the fundamental behaviors of colloids, nanomaterials, PFAS, and plastics; and (4) implications and applications of environmental nanotechnology for groundwater and soil remediation. This Special Issue will update the state-of-the-art and partially fill the knowledge gap regarding the transport and cotransport of colloids, nanomaterials, PFAS, and plastics in porous media.

Dr. Jianzhou He
Dr. Dengjun Wang
Dr. Chunming Su
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Toxics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • fate and transport
  • colloids
  • nanomaterials
  • plastics
  • PFAS
  • porous media
  • mathmatical modeling
  • emerging contaminants

Published Papers (1 paper)

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Significant Mobility of Novel Heteroaggregates of Montmorillonite Microparticles with Nanoscale Zerovalent Irons in Saturated Porous Media
Toxics 2022, 10(6), 332; https://doi.org/10.3390/toxics10060332 - 17 Jun 2022
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This study conducted laboratory column experiments to systematically examine the transport of novel heteroaggregates of montmorillonite (Mt) microparticles with nanoscale zerovalent irons (nZVIs) in saturated sand at solution ionic strengths (ISs) ranging from 0.001 to 0.2 M. Spherical nZVIs were synthesized using the [...] Read more.
This study conducted laboratory column experiments to systematically examine the transport of novel heteroaggregates of montmorillonite (Mt) microparticles with nanoscale zerovalent irons (nZVIs) in saturated sand at solution ionic strengths (ISs) ranging from 0.001 to 0.2 M. Spherical nZVIs were synthesized using the liquid phase reduction method and were attached on the plate-shaped Mt surfaces in monolayer. While complete deposition occurred for nZVIs in sand, significant transport was observed for Mt-nZVI heteroaggregates at IS ≤ 0.01 M despite the transport decrease with an increasing loading concentration of nZVIs on Mt. The increased mobility of Mt-nZVI heteroaggregates was because the attractions between nZVIs and sand collectors were reduced by the electrostatic repulsions between the Mt and the collector surfaces, which led to a decreased deposition in the sand columns. Complete deposition occurred for the Mt-nZVI heteroaggregates at IS ≥ 0.1 M due to a favorable deposition at Derjaguin–Landau–Verwey–Overbeek (DLVO) primary energy minima. Interestingly, a large fraction of the deposited heteroaggregates was released by reducing IS because of a monotonic decrease of interaction energy with separation distance for the heteroaggregates at low ISs (resulting in repulsive forces), in contrast to the irreversible deposition of nZVIs. Therefore, the fabricated heteroaggregates could also have high mobility in subsurfaces with saline pore water through continuous capture and release using multiple injections of water with low ISs. Our study was the first to examine the transport of heteroaggregates of a plate-like particle with spherical nanoparticles in porous media; the results have important implications in the use of nanoscale zerovalent iron for in situ soil and groundwater remediation. Full article
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