Effect of alginate on the aggregation kinetics of copper oxide nanoparticles (CuO NPs): bridging interaction and hetero-aggregation induced by Ca2+

Miao, Lingzhan; Wang, Chao; Hou, Jun; Wang, Peifang; Ao, Yanhui; Li, Yang; Lv, Bowen; Yang, Yangyang; You, Guoxiang; Xu, Yi

doi:10.1007/s11356-016-6358-1

Cited by 46 publications

(29 citation statements)

References 39 publications

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“…Further increase in pH resulted in charge reversal with zeta potential values of −24.76 ± 1.3 mV at pH 11 ± 0.1. These results were consistent with previous study findings [25], suggesting that the surface potential was positive when pH < pHiep and negative at pH > pHiep. In addition, NPs with zeta potential below ±15 mV were supposed to be unstable, while NPs with zeta potential higher than ±30 mV were considered stable in the solution.…”

Section: Characteristics Of Cuo Npssupporting

confidence: 94%

“…As shown in Figure 1, CuO NPs exhibit a stable and positive charge (+27.9 ± 1.3 mV) from pH 3.0-5.0. Subsequently, the zeta potential sharply decreased to the Isoelectric point (IEP) at a pHiep of approximately ~8.2 ± 0.1, which is consistent with earlier studies [9,23,25] investigating CuO NPs. Further increase in pH resulted in charge reversal with zeta potential values of −24.76 ± 1.3 mV at pH 11 ± 0.1.…”

Section: Characteristics Of Cuo Npssupporting

confidence: 91%

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Coagulation and Dissolution of CuO Nanoparticles in the Presence of Dissolved Organic Matter Under Different pH Values

et al. 2019

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The increased use of copper oxide nanoparticles (CuO NPs) in commercial products and industrial applications raises concerns about their adverse effects on aquatic life and human health. Therefore, the current study explored the removal of CuO NPs from water via coagulation by measuring solubility under various pH values and humic acid (HA) concentrations. The results showed that the media pH significantly affected the coagulation efficiency of CuO NPs (30 mg/L) under various (0–0.30 mM) ferric chloride (FC) dosages. The concentration of dissolved Cu2+ ions at pH 3–6 was (16.5–4.8 mg/L), which was higher than at other studied pH (7–11). Moreover, the simultaneous effect of coagulants and charge neutralization at pH 6–8 enhanced the removal of CuO NPs. At a lower FC (0–0.05 mM) dosage, the higher HA concentration inhibited the aggregation of CuO NPs. However, at the optimum dose of (0.2 mM) FC, the efficiency of turbidity removal and solubility of CuO NPs between pH 8 and 11 was above 98% and 5%, respectively, probably due to coagulant enmeshment. Our study suggested that coagulation was effective in removing the CuO NPs from the complex matrices with pH values ranging from 8–11. The findings of the present study provide insight into the coagulation and dissolution behavior of CuO NPs during the water treatment process.

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Section: Characteristics Of Cuo Npssupporting

confidence: 94%

Section: Characteristics Of Cuo Npssupporting

confidence: 91%

Coagulation and Dissolution of CuO Nanoparticles in the Presence of Dissolved Organic Matter Under Different pH Values

et al. 2019

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“…The increased agglomeration in the NCM can likely be attributed to the presence of various cations in the NCM, which compress the electrical double layer and increase the likelihood of particle–particle interactions (Prathna et al ). Divalent cations in particular, such as those in our NCM, have been demonstrated to impact the stability of NPs in aqueous media (Baalousha et al ; Miao et al ). Large agglomerates also formed in MQW, suggesting instability of the ZnO NPs in suspension, even in pure water.…”

Section: Discussionmentioning

confidence: 99%

Comparative dissolution, uptake, and toxicity of zinc oxide particles in individual aquatic species and mixed populations

Harper

2019

Enviro Toxic and Chemistry

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Potential differences in species susceptibility to nanoparticle (NP) contaminants make the use of multispecies community toxicity testing strategies beneficial in understanding NP risk to aquatic environments. Because of the limited knowledge of zinc oxide (ZnO) NP fate and toxicity, we conducted multispecies exposures and compared the responses of individual species to the same species in a community comprised of algae ( Chlamydomonas reinhardtii ), bacteria ( Escherichia coli ), crustaceans ( Daphnia magna ), and zebrafish ( Danio rerio ). Different‐sized ZnO particles and ionic Zn were compared to investigate the contribution of particulate and dissolved Zn to aquatic organism toxicity. Each organism and community was exposed to Zn sources at 0.08, 0.8, and 8 mg Zn/L. The present results indicate that all 3 types of Zn elicited differential toxicity among test organisms, with stronger adverse outcomes observed in single species than within a community. The community assay (nanocosm) we developed increased resilience to all Zn exposures by 5 to 10% compared to individual exposures at equivalent concentrations. In addition, the uptake and toxicity of ZnO particles to aquatic communities appear to be driven by rapid dissolution and the concomitant impacts of zinc ion toxicity, and the size of the ZnO particles had little impact on uptake or toxicity. The nanocosm assay could be a useful screening tool for rapidly assessing the potential impacts of nanomaterials to aquatic species. Environ Toxicol Chem 2019;38:591–602. © 2019 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals, Inc. on behalf of SETAC.

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“…Sheng et al (2016) reported that the aggregation of hematite NPs can reduce the adsorption of metal Cu (II). The effect of EPS on the stability of manufactured nanoparticles (NPs) and natural iron (hydr)oxide colloids have also been investigated by several authors (Khan et al, 2011;Miao et al, 2016;Xu et al, 2016). For instance, exopolysaccharides extracted from the bacterium Bacillus pumilus are shown to play an important role in the stability of silver NPs in water (Khan et al, 2011), and flocculent sludge-derived EPS are found to enhance the stability of CuO NPs (Miao et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The effect of EPS on the stability of manufactured nanoparticles (NPs) and natural iron (hydr)oxide colloids have also been investigated by several authors (Khan et al, 2011;Miao et al, 2016;Xu et al, 2016). For instance, exopolysaccharides extracted from the bacterium Bacillus pumilus are shown to play an important role in the stability of silver NPs in water (Khan et al, 2011), and flocculent sludge-derived EPS are found to enhance the stability of CuO NPs (Miao et al, 2016). It has also been reported that the addition of EPS extracted from bloom-forming cyanobacteria that are ubiquitously present in eutrophic waters can greatly decrease the hydrodynamic diameters of Al2O3 colloidal particles, and the electrolyte cations can induce the aggregation of colloidal particles (Xu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Towards a better understanding of the aggregation mechanisms of iron (hydr)oxide nanoparticles interacting with extracellular polymeric substances: Role of pH and electrolyte solution

Dong

Cai

Peacock

et al. 2018

Science of The Total Environment

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Extracellular polymeric substances (EPS) are ubiquitous in the soil and water environment and interact strongly with mineral surfaces. However, these interactions and their impacts on the behavior and fate of minerals remain poorly understood. Here, for a better understanding of the colloidal stability of minerals in the environment, we investigated the aggregation of goethite (α-FeOOH) nanoparticles (NPs) in the presence of EPS from Bacillus subtilis under different environmental conditions (pH, ionic strength and ionic valence). Results showed that the aggregation processes of goethite NPs are determined by the solution chemistry, and the colloidal stability of goethite NPs is strongly influenced by the addition of EPS. In the absence of ionic strength, the addition of EPS promotes the aggregation of goethite NPs only when the pH (pH = 6) is less than the point of zero charge for the goethite nanoparticles (pH ≈ 8). In the presence of ionic strength, the aggregation rate of goethite NPs increases with increasing concentration of NaCl, NaNO and NaSO solutions, and after the addition of EPS solution, the critical coagulation concentrations (CCC) of goethite NPs are increased from 43.0, 56.7 and 0.39 mM to 168.0, 304.9 and 126.2 mM in the three electrolyte solutions, indicating that the addition of EPS inhibits the aggregation of goethite NPs. While in NaPO solution, when the concentration of NaPO solution ranged from 0 to 1 mM, the aggregation rate of goethite NPs increases first, followed by a decrease, and with the concentration of NaPO solution exceeding 1 mM, the aggregation rate of goethite NPs increases again, due to the charge screening by sodium counter ions. This study provides a fundamental understanding of the behavior of goethite NPs in natural soil and water environments.

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Effect of alginate on the aggregation kinetics of copper oxide nanoparticles (CuO NPs): bridging interaction and hetero-aggregation induced by Ca2+

Cited by 46 publications

References 39 publications

Coagulation and Dissolution of CuO Nanoparticles in the Presence of Dissolved Organic Matter Under Different pH Values

Coagulation and Dissolution of CuO Nanoparticles in the Presence of Dissolved Organic Matter Under Different pH Values

Comparative dissolution, uptake, and toxicity of zinc oxide particles in individual aquatic species and mixed populations

Towards a better understanding of the aggregation mechanisms of iron (hydr)oxide nanoparticles interacting with extracellular polymeric substances: Role of pH and electrolyte solution

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