Traceability of fluorescent engineered nanomaterials and their fate in complex liquid waste matrices

Part, Florian; Zaba, Christoph; Bixner, Oliver; Zafiu, Christian; Sinner, Eva‐Kathrin; Huber-Humer, Marion

doi:10.1016/j.envpol.2016.04.032

Cited by 15 publications

(11 citation statements)

References 51 publications

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“…Pre-treatment of these wastes using techniques such as aerobic degradation or incineration may lead to ENM accumulation in solid residues, which, depending on specific waste management regulations, will likely be landfilled. Once these wastes are landfilled, mechanical or chemical processes may lead to ENM release from end-of-life products and/or ENM transformations (e.g., natural weathering, alteration/degradation processes, mechanical stress) (Lozano and Berge 2012;Musee 2011b;Part et al 2016b;Reinhart et al 2010). ENMs may ultimately be released from the landfill through liquid and gas emissions or by wind erosion.…”

Section: Potential Nanoemissions From Landfill Sitesmentioning

confidence: 99%

“…As a consequence, additional work is needed to draw specific conclusions about ENM transport and permeability in landfills bodies. Part et al (2016b) studied the potential mobility of sterically stabilized fluorescent nanocrystals (quantum dots or QDs), which were dispersed in real MSW landfill leachates and stored at different temperatures for over more than six months. Their laboratory-scale tests indicated that the pH did not significantly influence the colloidal stability of QDs, as the pH in mature MSW landfill leachates showed high pH buffer capacities due to abundant carbonates and therefore remained stable for the whole period under consideration.…”

Section: Influence Of Landfill Leachate Characteristics On Enm Mobilitymentioning

confidence: 99%

“…However, the authors concluded that QD colloidal stability and potential transformation processes in the MSW landfill leachate used was predominantly affected by the residence time, sample storage temperature, DOC, and electrolyte content. In addition, Part et al (2016b) emphasised that the specific particle surface properties or capping agents, which are commonly used for steric stabilization (e.g., organic acids or surfactants), significantly influenced ENM mobility in MSW landfill leachates.…”

Section: Influence Of Landfill Leachate Characteristics On Enm Mobilitymentioning

confidence: 99%

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A review of the fate of engineered nanomaterials in municipal solid waste streams

et al. 2018

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Significant knowledge and data gaps associated with the fate of product-embedded engineered nanomaterials (ENMs) in waste management processes exist that limit our current ability to develop appropriate end-of-life management strategies. This review paper was developed as part of the activities of the IWWG ENMs in Waste Task Group. The specific objectives of this review paper are to assess the current knowledge associated with the fate of ENMs in commonly used waste management processes, including key processes and mechanisms associated with ENM fate and transport in each waste management process, and to use that information to identify the data gaps and research needs in this area. Literature associated with the fate of ENMs in wastes was reviewed and summarized. Overall, results from this literature review indicate a need for continued research in this area. No work has been conducted to quantify ENMs present in discarded materials and an understanding of ENM release from consumer products under conditions representative of those found in relevant waste management process is needed. Results also indicate that significant knowledge gaps associated with ENM behaviour exist for each waste management process investigated. There is a need for additional research investigating the fate of different types of ENMs at larger concentration ranges with different surface chemistries. Understanding how changes in treatment process operation may influence ENM fate is also needed. A series of specific research questions associated with the fate of ENMs during the management of ENM-containing wastes have been identified and used to direct future research in this area.

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Section: Potential Nanoemissions From Landfill Sitesmentioning

confidence: 99%

Section: Influence Of Landfill Leachate Characteristics On Enm Mobilitymentioning

confidence: 99%

Section: Influence Of Landfill Leachate Characteristics On Enm Mobilitymentioning

confidence: 99%

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A review of the fate of engineered nanomaterials in municipal solid waste streams

et al. 2018

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“…However, HA adsorption at the wavelength of emission peak for both carbon dots became significant at high HA concentration (50 ppm and 100 ppm), which would further contribute to the observed quenching. The negative impact by dissolved NOM on CDs and a-CDs has implications for sensing, potentially limiting the applications of CDs in high BOD streams or wastewaters (Part et al 2016).…”

Section: Fluorescencementioning

confidence: 99%

Molecularly imprinted polymers and their application as environmental sensors

Dai¹

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Molecularly imprinted polymers are specialty polymers with ability of selectively capturing target molecules. They show great potential to be environmental sensors for the detection of specific contaminant. The overall research objective is to investigate the sensing ability of MIPs based on two mechanisms fluorescence quenching and reflectance for two example contaminants 2, 4-dinitrotoluene and 2-butoxylethanol, which are fingerprinting contaminant of explosive manufacturing and hydraulic fracking. The water chemistry effects are explored on MIPs for their potential use as in-situ sensors in complex aquatic environments. Fluorescent carbon dots with different surface functionality were fabricated and their environmental fate was explored. Amino-functionalized carbon dots (AC-dots) were applied to fluorescently label a molecularly imprinted polymer (MIP) for 2, 4-dinitrotoluene (DNT) as a template. DNT is specifically captured by the cavities in the MIP and interact with AC-dots on the surface, resulting in quenching of the fluorescence of the AC-dots. Response to DNT reaches equilibrium within [about]30 min. The method has a dynamic range that extends from 1 to 15 ppm, and allows for quantitation of DNT in aqueous solutions, with a detection limit of 0.28 ppm. Selectivity tests conducted in presence of DNT analogs demonstrated the specific recognition of DNT. The effect of sample water chemistry on carbon dots labeled molecularly imprinted polymer (AC-MIP) sensor the detection of 2, 4-dinitrotoluene (DNT) was investigated. With the increase of ionic strength from 1 mM to 100 mM, the quenching amount of MIPs decreased about 19% and 30% with NaCl and CaCl2 respectively. In the range of pH from 4 to 9, quenching effect is slightly higher at basic environment for both MIPs and non-imprinted polymers (NIPs) resulting from swelling properties of the films. NOM added the quenching amount to the sensor with a modified equation developed with NOM as a variable. In both lake water and tap water, DNT concentrations read by the sensors were very close to the HPLC measured DNT concentrations with the range from 72% to 105%. Molecularly imprinted polymers (MIPs) sensors for detection of 2-butoxyethanol (2BE), a pollutant associated with hydraulic fracturing contamination, were developed based on the combination of a colloidal crystal templating method and a molecular imprinting technique. MIPs exhibited higher binding than non-imprinted films (NIPs) due to the specific adsorption provided by molecular imprinting with imprinting efficiencies around 2. Optical tests were performed because of the uniformly ordered porous structure. The reflectance spectra of the sensors showed Bragg's peaks, which responded to the presence of 2BE; peaks presented increasing red shifts up to 50 nm with 2BE concentrations in the range of 1 ppb to 100 ppm, which allowed quantitative estimates of present 2BE concentration in aqueous solutions. The material has the potential for early detection of hydraulic fracturing sites contamination.

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“…However, HA adsorption at the wavelength of emission peak for both carbon dots became significant at high HA concentration (50 and 100 mg/L), which would further contribute to the observed quenching. The negative impact by dissolved NOM on CDs and a-CDs has implications for sensing, potentially limiting the applications of CDs in high BOD streams or wastewaters [145].…”

Section: Fluorescencementioning

confidence: 99%

Interaction at the solid-water interface of 0d and 2d carbon nanoparticles : environmental impacts and applications for contaminant removal

Bayati¹

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Carbon dots (CDs) and graphene oxide (GO) are rapidly emerging carbon-based nanomaterials that, due to their growing applications, will inevitably find their way to natural waters; however, their environmental fate is mostly unknown. Carbon dots with different surface functionality and graphene oxide were fabricated and characterized. Their surface charge, given by the zeta potential, and their hydrodynamic diameter in suspension were investigated under a variety of environmentally relevant conditions. The effect of ionic strength was studied in the presence of monovalent (NaCl) and divalent (CaCl2) cations, for pH levels from 3 to 11; humic acid was used as a model for dissolved natural organic matter. Total potential energies of interactions were modeled by classical DLVO theory. The experimental results for CDs showed that water chemistry altered the surface charge of the nanomaterials, but their hydrodynamic size could not be correlated to those changes. Nanoparticles remained largely stable in suspension, with some exception at the highest ionic strength considered. DLVO theory did not adequately capture the aggregation behavior of the system. Moreover, cation and/or humic acid adsorption negatively affected the emission intensity of the particles, suggesting limitations to their use in natural water sensing applications. The results for GO showed that the GO is negatively charged over a wide range of pH and the pH did significantly affect GO stability at a level of 4 or higher, but the particles became unstable below pH 3 due to protonation of âˆ’COOH at the edge. Ionic strength (IS) and salt type had observable effects on stability as a result of electrical double layer compression and specific interactions. CaCl2 affects GO more noticeably than NaCl because of the binding ability of Ca2+ ions with carboxyl and hydroxyl functional groups. The applicability of DLVO theory as a predictive tool was investigated by modeling GO sheets in two different geometries; three-dimensional sphere like particles and two-dimensional particles at different values of pH and IS. Overall, the specific interactions and chemical structure of adsorbed organics had a dominant role in GO stability. Laser induced graphene (LIG) can be fabricated in one-step, scalable, reagent-free process, by irradiation of a commercial polyimide (PI film) by a CO2 infrared laser under ambient conditions. This approach is environmentally and economically promising fabrication method. Laser induced graphene (LIG) was successfully fabricated on microporous ceramic membranes. The surface area, morphology, and chemical characterizations were performed on the LIG layer. Water contact angle measurements showed the hydrophobicity of LIG. Pure water and solvents with different polarities were used to understand the solvent flux behavior of LIG membrane. The LIG membrane showed very high non-polar solvent fluxes and remarkably low water permeability, and thus, the transport through the LIG membrane is related to dipole moment and dielectric constant, represented by solvent polarity. The LIG membrane achieved 90 [percent] rejection for 255 nm diameter silica particles, suggesting the presence of submicron size connecting pore channels that dominate the transport mechanism. Furthermore, LIG was used as adsorbent for the removal of atrazine (ATZ) from water. The effect of water chemistry, presence of humic acid (HA), adsorption time, and initial ATZ concentration on the adsorption process was explored. The prepared LIG exhibited significant removal of ATZ from aqueous solutions; hydrophobicity and [pi]-[pi] interactions played important roles in the process. Adsorption of ATZ on LIG followed a pseudo-second order kinetic model and Langmuir model for the isotherm with maximum adsorption capacity of 15.0 mg ATZ/g LIG. Adsorption was more favorable at higher pH and not affected by ionic strength. LIG exhibited enhanced performance over many previously reported adsorbents. The introduction stage of HA with respect to ATZ influenced the results: pre-introduction of HA reduced ATZ adsorption by 32 [percent], whereas post-introduction of HA resulted in a slight release of ATZ from the LIG.

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Traceability of fluorescent engineered nanomaterials and their fate in complex liquid waste matrices

Cited by 15 publications

References 51 publications

A review of the fate of engineered nanomaterials in municipal solid waste streams

A review of the fate of engineered nanomaterials in municipal solid waste streams

Molecularly imprinted polymers and their application as environmental sensors

Interaction at the solid-water interface of 0d and 2d carbon nanoparticles : environmental impacts and applications for contaminant removal

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