Engineered Nanomaterials as Emerging Contaminants in Water

Westerhoff, Paul

doi:10.1061/9780784410301.ch16

Cited by 6 publications

(5 citation statements)

References 95 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18 ENPs have subsequently become an emerging pollutant in environmental realm. 19 The annual increase of fullerenes and nano-TiO 2 in sludge-treated soil was 1 ng/kg and 89 μg/kg. 20 Studies of ENPs in soil media have focused on the transport of ENPs in soils, 21 interactions between ENPs and terrestrial plants, 22,23 the effects of ENPs on the uptake and transport of pesticides or metal ions by plants, 22,24 and the effects of ENPs on the soil microbial community composition and its activity.…”

Section: ■ Introductionmentioning

confidence: 95%

“…Engineered nanoparticles (ENPs) enter the terrestrial environment following their use in modern agriculture, food technology, soil remediation, and the addition of biosolids to agricultural soils . ENPs have subsequently become an emerging pollutant in environmental realm . The annual increase of fullerenes and nano-TiO 2 in sludge-treated soil was 1 ng/kg and 89 μg/kg .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Engineered Nanoparticles on the Enantioselective Transformation of Metalaxyl Agent and Commercial Metalaxyl in Agricultural Soils

Liang

Huang

Zhang

2016

J. Agric. Food Chem.

View full text Add to dashboard Cite

The adsorption coefficient of racemic metalaxyl onto an agriculture soil was small and non-enantioselective. Biotransformation was the predominant pathway for the elimination of R-metalaxyl, while abiotic and biotransformation made a comparable contribution to the degradation of S-metalaxyl. Metalaxyl acid was the main transformation intermediate. The enantiomer fraction of metalaxyl decreased with an increase in its initial spike concentration or the presence of the co-constituents in metalaxyl commercial products. Under simulated solar irradiation, the presence of TiO2 promoted the overall transformation kinetics through enhanced biotransformation and extra photo-induced chemical reactions. The promotion was enantioselective and thereafter changed the enantiomer fraction. The results obtained in this study showed that some achiral parameters, although they have no direct impact on enantioselective reactions with enantiomers, can significantly affect the enantioselective transformation of racemic metalaxyl. Thus, our results indicate that the contribution of chemical interactions on the enantioselective transformation of chiral pesticides may be underestimated.

show abstract

Section: ■ Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Effects of Engineered Nanoparticles on the Enantioselective Transformation of Metalaxyl Agent and Commercial Metalaxyl in Agricultural Soils

Liang

Huang

Zhang

2016

J. Agric. Food Chem.

View full text Add to dashboard Cite

show abstract

“…This could be highly dangerous because several studies have reported on the adverse effects of NPs on human health. As a consequence, NPs have been classified as emerging pollutants [ 87 ]. Research on nZVI has shown lower toxic effects than other NPs, such as Cu and Ag [ 23 ].…”

Section: Risks and (Dis)advantages Associated With The Use Of Nzvimentioning

confidence: 99%

nZVI-Based Nanomaterials Used for Phosphate Removal from Aquatic Systems

et al. 2023

View full text Add to dashboard Cite

In the last decade, the application of nanoscale zero-valent iron (nZVI) has garnered great attention as an adsorbent due to its low cost, non-toxicity, high porosity, and BET-specific surface area. In particular, the immobilization of nZVI particles onto inorganic and organic substrates (nanocomposites) decreased its agglomeration, allowing them to be effective and achieve greater adsorption of pollutants than pristine nanoparticles (NPs). Although nZVI began to be used around 2004 to remove pollutants, there are no comprehensive review studies about phosphate removal from aquatic systems to date. For this reason, this study will show different types of nZVI, pristine nZVI, and its nanocomposites, that exist on the market, how factors such as pH solution, oxygen, temperature, doses of adsorbent, initial phosphate concentration, and interferents affect phosphate adsorption capacity, and mechanisms involved in phosphate removal. We determined that nanocomposites did not always have higher phosphate adsorption than pristine nZVI particles. Moreover, phosphate can be removed by nZVI-based nanoadsorbents through electrostatic attraction, ion exchange, chemisorption, reduction, complexation, hydrogen bonding, and precipitation mechanisms. Using the partition coefficient (PC) values, we found that sepiolite-nZVI is the most effective nanoadsorbent that exists to remove phosphate from aqueous systems. We suggest future studies need to quantify the PC values for nZVI-based nanoadsorbents as well as ought to investigate their phosphate removal efficiency under natural environmental conditions.

show abstract

“…Although common trends of CEC emergence have been speculated to exist [4], yet unanswered questions regarding the epistemology of CECs include:…”

Section: Time Course Of Cec Emergencementioning

confidence: 99%

Epistemology of contaminants of emerging concern and literature meta-analysis

Halden

2015

Journal of Hazardous Materials

View full text Add to dashboard Cite

A meta-analysis was conducted to inform the epistemology, or theory of knowledge, of contaminants of emerging concern (CECs). The CEC terminology acknowledges the existence of harmful environmental agents whose identities, occurrences, hazards, and effects are not sufficiently understood. Here, data on publishing activity were analyzed for 12 CECs, revealing a common pattern of emergence, suitable for identifying past years of peak concern and forecasting future ones: dichlorodiphenyltrichloroethane (DDT; 1972, 2008), trichloroacetic acid (TCAA; 1972, 2009), nitrosodimethylamine (1984), methyl tert-butyl ether (2001), trichloroethylene (2005), perchlorate (2006), 1,4-dioxane (2009), prions (2009), triclocarban (2010), triclosan (2012), nanomaterials (by 2016), and microplastics (2022 ± 4). CECs were found to emerge from obscurity to the height of concern in 14.1 ± 3.6 years, and subside to a new baseline level of concern in 14.5 ± 4.5 years. CECs can emerge more than once (e.g., TCAA, DDT) and the multifactorial process of emergence may be driven by inception of novel scientific methods (e.g., ion chromatography, mass spectrometry and nanometrology), scientific paradigm shifts (discovery of infectious proteins), and the development, marketing and mass consumption of novel products (antimicrobial personal care products, microplastics and nanomaterials). Publishing activity and U.S. regulatory actions were correlated for several CECs investigated.

show abstract

Engineered Nanomaterials as Emerging Contaminants in Water

Cited by 6 publications

References 95 publications

Effects of Engineered Nanoparticles on the Enantioselective Transformation of Metalaxyl Agent and Commercial Metalaxyl in Agricultural Soils

Effects of Engineered Nanoparticles on the Enantioselective Transformation of Metalaxyl Agent and Commercial Metalaxyl in Agricultural Soils

nZVI-Based Nanomaterials Used for Phosphate Removal from Aquatic Systems

Epistemology of contaminants of emerging concern and literature meta-analysis

Contact Info

Product

Resources

About