Oxidative dissolution of polymer-coated CdSe/ZnS quantum dots under UV irradiation: Mechanisms and kinetics

Yang, Li; Zhang, Wen; Li, Kungang; Ying, Yao; Niu, Junfeng; Chen, Yongsheng

doi:10.1016/j.envpol.2012.01.047

Cited by 57 publications

(67 citation statements)

References 52 publications

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“…35,36 Because it might take up to 48 h for the ion release from freshly prepared NPs suspensions to reach equilibrium according to preliminary results, we measured the ion release after 48 h. Four milliliters of NP suspensions of 10 mg/L in the Dryl's solution was sampled from plastic centrifugation tubes (Fisher Scientific), and the released ions were separated from the NPs using Amicon Ultra-4 centrifugal filter units with pore diameters of 1−2 nm (Amicon Ultracel 3K, Millipore, United States). After centrifugation for 30 min at 7000g (5430R, Eppendorf, Germany), 3 mL of the filtrates was collected and mixed with 2 mL of 67% nitric acid for ICP-MS analysis.…”

Section: ■ Materials and Methodsmentioning

confidence: 98%

Surface Interactions Affect the Toxicity of Engineered Metal Oxide Nanoparticles toward Paramecium

Chen

Zhang

et al. 2012

Chem. Res. Toxicol.

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To better understand the potential impacts of engineered metal oxide nanoparticles (NPs) in the ecosystem, we investigated the acute toxicity of seven different types of engineered metal oxide NPs against Paramecium multimicronucleatum, a ciliated protozoan, using the 48 h LC(50) (lethal concentration, 50%) test. Our results showed that the 48 h LC(50) values of these NPs to Paramecium ranged from 0.81 (Fe(2)O(3) NPs) to 9269 mg/L (Al(2)O(3) NPs); their toxicity to Paramecium increased as follows: Al(2)O(3) < TiO(2) < CeO(2) < ZnO < SiO(2) < CuO < Fe(2)O(3) NPs. On the basis of the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, interfacial interactions between NPs and cell membrane were evaluated, and the magnitude of interaction energy barrier correlated well with the 48 h LC(50) data of NPs to Paramecium; this implies that metal oxide NPs with strong association with the cell surface might induce more severe cytotoxicity in unicellular organisms.

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Section: ■ Materials and Methodsmentioning

confidence: 98%

Surface Interactions Affect the Toxicity of Engineered Metal Oxide Nanoparticles toward Paramecium

Chen

Zhang

et al. 2012

Chem. Res. Toxicol.

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“…However, a rough estimate of average primary particle size and shape of the CuONPs in the stock suspension, measured from the TEM images, was 39.5 ± 2.03 nm, and the particles were roughly spherical, which fell within the range of 30-50 nm specified by the manufacturer and agreed with the manufacturer's report. The larger size of CuO-NPs measured by DLS compared to TEM may be attributed to the propensity of CuO-NPs to agglomerate in Milli-Q water or the measurement bias of the DLS technique toward large particles or aggregates, which in turn results in increased scattering (Clark et al, 2010;Li et al, 2012;Zhang et al, 2011).…”

Section: Characterization Of Cuo-np Stock Suspensionmentioning

confidence: 98%

Effects of water quality parameters on agglomeration and dissolution of copper oxide nanoparticles (CuO-NPs) using a central composite circumscribed design

Son

Vavra

Forbes

2015

Science of The Total Environment

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“…Dissolved oxygen Dissolved oxygen (DO) in aqueous environments tends to oxidize metallic NMs such as Ag NMs and QDs [91][92][93][94] resulting in the formation of surface oxide layer (e.g. AgO 95 ), release of metallic cations 92,95,96 , and NM aggregation 91,92,97 . For instance, the aggregation rate of Ag NMs is much faster (e.g., 3-8 times depending on the primary particle size) in the presence of DO than those in the absence of DO 91 .…”

Section: 3mentioning

confidence: 99%

“…Furthermore, NM aggregation can be attributed to the degradation/detachment of surface coating in the presence of oxygen. For instance, the destabilization of Ag NMs, CdS NMs and QDs was found to be related to the detachment/degradation of surface coating in the presence of oxygen, compression of EDL and surface energy changes 92,97,99 . In contrast, anoxic and anaerobic conditions exert low redox potentials, which inhibit oxidation and consequently lead to different aggregation kinetics 92,97 .…”

Section: 3mentioning

confidence: 99%

Effect of nanomaterial and media physicochemical properties on nanomaterial aggregation kinetics

Baalousha

2017

NanoImpact

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Understanding nanomaterial (NM) stability is required for an adequate interpretation of ecotoxicological test outcomes, fate and behavior studies, to generate parameters (such as critical coagulation concentration, CCC; and attachment efficiency, α) for environmental fate models, and for comparison among different studies. Numerous studies measured CCC and α for different types of NMs with a major focus on investigating the effect of ionic strength, ion valency and natural organic matter, with fewer studies investigating the effect of NM and other medium properties. Consequently, wide discrepancies can be found in the literature among the reported CCC and α values, even for NMs of the same composition and properties. In this context, the aim of this review is to investigate the dependence of NM aggregation kinetic parameters (e.g. CCC and α) on NM and medium physicochemical properties and to rationalize the differences observed among different studies, where possible.We found that various material and medium physicochemical properties need to be considered to predict NM aggregation behavior. Some trends were observed and rationalized based on theoretical studies and data available in the literature. For charge stabilized NMs with constant zeta potential, NM stability (CCC) decreases with the increase in Hamaker constant, increase in NM size, increase in buffer (carbonate and phosphate) concentration, increase in temperature, and light irradiation. The CCC increase with counterion complexation. For sterically stabilized NMs, the CCC increases with the increased surface coverage by the capping agent molecules and completely coated NMs do not aggregate even in high ions strength medium (e.g. seawater). These results highlight the significant role of NM and medium properties in influencing the environmental stability and fate of NMs, and will help refine NM fate models and improve our understanding of NM uptake and toxicity.

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Oxidative dissolution of polymer-coated CdSe/ZnS quantum dots under UV irradiation: Mechanisms and kinetics

Cited by 57 publications

References 52 publications

Surface Interactions Affect the Toxicity of Engineered Metal Oxide Nanoparticles toward Paramecium

Surface Interactions Affect the Toxicity of Engineered Metal Oxide Nanoparticles toward Paramecium

Effects of water quality parameters on agglomeration and dissolution of copper oxide nanoparticles (CuO-NPs) using a central composite circumscribed design

Effect of nanomaterial and media physicochemical properties on nanomaterial aggregation kinetics

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