Heteroaggregation, transformation and fate of CeO2 nanoparticles in wastewater treatment

Barton, Lauren E.; Auffan, Mélanie; Olivi, Luca; Bottero, Jean‐Yves; Wiesner, Mark R.

doi:10.1016/j.envpol.2015.03.035

Cited by 52 publications

(28 citation statements)

References 39 publications

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“…Nevertheless, outcomes can be improved by using carefully designed mesocosms and associated experiments. 84 For example, combined with analyzing mesocosm samples, performing practical “functional assays” 38 such as for heteroaggregation, 210 allows for anticipating phenomena and later interpreting ENM transformation and compartmentalization in mesocosms. 177 Similarly, batch physical association experiments—if conducted using realistic components, and over time frames that allow for quantifiable mass transfer—can assess ENM biomass association and readily suggest ENM fates in WWTPs.…”

Section: What Exposure and Design Considerations Drive Mesocosm Assesmentioning

confidence: 99%

Considerations of Environmentally Relevant Test Conditions for Improved Evaluation of Ecological Hazards of Engineered Nanomaterials

Holden

Gardea‐Torresdey

Klaessig

et al. 2016

Environ. Sci. Technol.

Self Cite

197

150

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Engineered nanomaterials (ENMs) are increasingly entering the environment with uncertain consequences including potential ecological effects. Various research communities view differently whether ecotoxicological testing of ENMs should be conducted using environmentally relevant concentrations—where observing outcomes is difficult—versus higher ENM doses, where responses are observable. What exposure conditions are typically used in assessing ENM hazards to populations? What conditions are used to test ecosystem-scale hazards? What is known regarding actual ENMs in the environment, via measurements or modeling simulations? How should exposure conditions, ENM transformation, dose, and body burden be used in interpreting biological and computational findings for assessing risks? These questions were addressed in the context of this critical review. As a result, three main recommendations emerged. First, researchers should improve ecotoxicology of ENMs by choosing test endpoints, duration, and study conditions—including ENM test concentrations—that align with realistic exposure scenarios. Second, testing should proceed via tiers with iterative feedback that informs experiments at other levels of biological organization. Finally, environmental realism in ENM hazard assessments should involve greater coordination among ENM quantitative analysts, exposure modelers, and ecotoxicologists, across government, industry, and academia.

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Section: What Exposure and Design Considerations Drive Mesocosm Assesmentioning

confidence: 99%

Considerations of Environmentally Relevant Test Conditions for Improved Evaluation of Ecological Hazards of Engineered Nanomaterials

Holden

Gardea‐Torresdey

Klaessig

et al. 2016

Environ. Sci. Technol.

Self Cite

197

150

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“…The observed rate of inactivation will therefore be function of these intrinsic reaction rates and the rate of nZVI attachment to bacteria. If the intrinsic reaction in either case is assumed to be first order described by a rate constant, k int , the overall rate constant for the reaction, k T , can be described as sequential processes of transport, attachment and reaction (Barton et al, 2015). Transport is described by a collision rate kernel, β, which describes nanoparticle transport to the vicinity of a bacterium.…”

Section: - Nzvi Cytotoxicitymentioning

confidence: 99%

A review of the environmental implications of in situ remediation by nanoscale zero valent iron (nZVI): Behavior, transport and impacts on microbial communities

Lefèvre

Bossa

Wiesner

et al. 2016

Science of The Total Environment

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321

103

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The increasing use of strategies incorporating nanoscale zero valent iron (nZVI) for soil and groundwater in situ remediation is raising some concerns regarding the potential adverse effects nZVI could have on indigenous microbial communities and ecosystem functioning. This review provides an overview of the current literature pertaining to the impacts of nZVI applications on microbial communities. Toxicity studies suggest that cell membrane disruption and oxidative stress through the generation of Fe2+ and reactive oxygen species by nZVI are the main mechanisms contributing to nZVI cytotoxicity. In addition, nZVI has been shown to substantially alter the taxonomic and functional composition of indigenous communities. However, because the physico-chemical conditions encountered in situ highly modulate nZVI toxicity, a better understanding of the environmental factors affecting nZVI toxicity and transport in the environment is of primary importance in evaluating the ecological consequences that could result from a more extensive use of nZVI.

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“…Ag and ZnO) in WWTPs, limiting the release of ionic species (Kim et al, 2014;Kim et al, 2010;Levard et al, 2012). However, due to the obvious differences in the chemistry of stormwater and wastewater, NMs should be expected to undergo different transformations in stormwater systems compared to waste water systems and within WWTPs (Barton et al, 2015;Brar et al, 2010;Doolette et al, 2013;Kaegi et al, 2013;Kaegi et al, 2011), and the rates of these transformation processes are likely to be different, requiring further research. For instance, urban water runoff systems have lower concentrations of sulfide compared with waste water systems including within WWTPs.…”

Section: Pathways and Transformations Of Nms In The Urban Environmentmentioning

confidence: 99%

Outdoor urban nanomaterials: The emergence of a new, integrated, and critical field of study

Baalousha

Yang

Vance

et al. 2016

Science of The Total Environment

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Engineered nanomaterials (ENMs) are currently widely incorporated in the outdoor urban environmental fabric and numerous new applications and products containing ENMs are expected in the future. As has been shown repeatedly, products containing ENMs have the potential, at some point in their lifetime, to release ENMs into their surrounding environment. However, the expanding body in environmental nanomaterial research has not yet shifted toward ENMs in the context of the complex outdoor urban environment. This is especially surprising because the world's human populations are on a steady march toward more and more urbanization and technological development, accompanied with increased applications for ENMs in the outdoor urban environment. Our objective for this paper is therefore to review, assess, and provide new information in this emerging field. We provide an overview of nanomaterials (NMs, encompassing both ENMs and incidental nanomaterials, INMs) that are likely to be released in the urban environment from outdoor sources by discussing 1) the applications of ENMs that may lead to release of ENMs in urban areas, 2) the recently published data on the release of ENMs from novel nano-enabled applications in the outdoor urban environment, 3) the available literature on the occurrence of INMs in the atmosphere and within/on dust particles, and 4) the potential pathways and fate of NMs in the outdoor urban environment. This review is then followed by three case studies demonstrating the importance of NMs in the outdoor urban environment. The first and second case studies illustrate the occurrence of NMs in urban dust and stormwater ponds, respectively, whereas the third case study discusses the lessons learned from the release of NMs (e.g. Pt, ph and Rh) from automotive vehicle catalytic convertors. This article ends with a discussion of the research priorities needed to advance this emerging field of "outdoor urban nanomaterials" and to assess the potential risks of NMs in the context of urban environments.

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Heteroaggregation, transformation and fate of CeO2 nanoparticles in wastewater treatment

Cited by 52 publications

References 39 publications

Considerations of Environmentally Relevant Test Conditions for Improved Evaluation of Ecological Hazards of Engineered Nanomaterials

Considerations of Environmentally Relevant Test Conditions for Improved Evaluation of Ecological Hazards of Engineered Nanomaterials

A review of the environmental implications of in situ remediation by nanoscale zero valent iron (nZVI): Behavior, transport and impacts on microbial communities

Outdoor urban nanomaterials: The emergence of a new, integrated, and critical field of study

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