Effect of surfactants on the aggregation and stability of TiO2 nanomaterial in environmental aqueous matrices

Li, Xuankun; Yoneda, Minoru; Shimada, Yôko; Matsui, Yasuto

doi:10.1016/j.scitotenv.2016.09.065

Cited by 47 publications

(25 citation statements)

References 35 publications

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“…Dispersions of metal oxides containing sodium dodecylsulfate (SDS) have been extensively studied by different methods [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The specific adsorption of dodecylsulfate anions results in a reversal of the sign of the ζ potential of metal oxide particles from positive to negative in the acidic range.…”

Section: Introductionmentioning

confidence: 99%

Dispersions of Metal Oxides in the Presence of Anionic Surfactants

Ruchomski

Mączka

Kosmulski

2018

Colloids and Interfaces

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We studied the behavior of dilute dispersions of nanoparticles of hematite, alumina, and titania in the presence of various concentrations of very pure sodium dodecyl-, tetradecyl-, and hexadecylsulfate. The concentrations studied were up to critical micelle concentration (CMC) for sodium dodecylsulfate, and up to the solubility limit in case of sodium tetradecyl- and hexadecylsulfate. The dispersions were adjusted to different pH (3–11), and 10−3 M NaCl was used as the supporting electrolyte. The solid-to-liquid ratio was strictly controlled in all dispersions, and the behavior of fresh dispersions was compared with dispersions aged for up to eight days. The presence of very low concentrations of ionic surfactants had rather insignificant effects on the ζ potentials of the particles. At sufficient concentrations of ionic surfactants the isoelectric point (IEP) of metal oxides shifted to low pH, and the long-chain surfactants were more efficient in shifting the IEP than their shorter-chain analogues. Once the surfactant concentration reached a critical value, the ζ potentials of the particles reached a pH-independent negative value, which did not change on further increase in the surfactant concentration and/or aging of the dispersion. This critical concentration increases with the solid-to-liquid ratio, and it is rather consistent (for certain oxides and certain surfactants) when it is expressed as the amount of surfactant per unit of surface area. Surprisingly, the surfactant-stabilized dispersions always showed a substantial degree of aggregation; that is, the particle size observed in dispersions by dynamic light scattering was higher than the size of particles observed in dry powders by electron microscopy. Apparently, in spite of relatively high ζ potentials (about 60 mV in absolute value), the surfactant-stabilized dispersions consist of aggregates rather than of primary particles, and in certain dispersions the high concentration of surfactant seems to induce aggregation rather than prevent it.

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Section: Introductionmentioning

confidence: 99%

Dispersions of Metal Oxides in the Presence of Anionic Surfactants

Ruchomski

Mączka

Kosmulski

2018

Colloids and Interfaces

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“…Due to the high probability of the coexistence of surfactants and NMs in aqueous environments, studies on the effect of surfactants on the stability of NMs are essential. The presence of surfactants is expected to tremendously affect the stability of NMs, thereby altering their aggregation behavior as well as the ultimate bioavailability and eco-toxicity in aqueous environments [30–31].…”

Section: Introductionmentioning

confidence: 99%

Tailoring the stability/aggregation of one-dimensional TiO₂(B)/titanate nanowires using surfactants

Selmani

Lützenkirchen

Kučanda

et al. 2019

Beilstein J. Nanotechnol.

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The increased utilization of one-dimensional (1D) TiO2 and titanate nanowires (TNWs) in various applications was the motivation behind studying their stability in this work, given that stability greatly influences both the success of the application and the environmental impact. Due to their high abundance in aqueous environments and their rich technological applicability, surfactants are among the most interesting compounds used for tailoring the stability. The aim of this paper is to determine the influence of surfactant molecular structure on TNW stability/aggregation behavior in water and aqueous NaBr solution by dynamic and electrophoretic light scattering. To accomplish this, two structurally different quaternary ammonium surfactants (monomeric DTAB and the corresponding dimeric 12-2-12) at monomer and micellar concentrations were used to investigate TNW stability in water and NaBr. It was shown that TNWs are relatively stable in Milli-Q water. However, the addition of NaBr induces aggregation, especially as the TNW mass concentration increases. DTAB and 12-2-12 adsorb on TNW surfaces as a result of the superposition of favorable electrostatic and hydrophobic interactions. As expected, the interaction of TNWs with 12-2-12 was stronger than with DTAB, due to the presence of two positively charged head groups and two hydrophobic tails. As a consequence of the higher adsorption of 12-2-12, TNWs remained stable in both media, while DTAB showed an opposite behavior. In order to gain more insight into changes in the surface properties after surfactant adsorption on the TNW surface, a surface complexation model was employed. With this first attempt to quantify the contribution of the surfactant structure on the adsorption equilibrium according to the observed differences in the intrinsic log K values, it was shown that 12-2-12 interacts more strongly with TNWs than DTAB. The modelling results enable a better understanding of the interaction between TNWs and surfactants as well as the prediction of the conditions that can promote stabilization or aggregation.

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“…The TiO 2 aggregates with high stability and appropriate hydrodynamic diameter in the complicated system could promote the capture and precipitation of TiO 2 , thereby reducing its harm to the environment. 26,27 Recently, the microwave-assisted hydrothermal method (MWH) has attracted signicant interest in the preparation of nano-photocatalysts, [28][29][30] mainly in the form of nanoparticles. Compared with conventional heating, microwave-assisted preparation is characterized by a rapid heating rate, high energy efficiency, molecular homogeneity, selectivity, and convenience.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of V-modified TiO₂ nanorod-aggregates by a facile microwave-assisted hydrothermal process and photocatalytic degradation towards PCP-Na under solar light

et al. 2019

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Effect of surfactants on the aggregation and stability of TiO2 nanomaterial in environmental aqueous matrices

Cited by 47 publications

References 35 publications

Dispersions of Metal Oxides in the Presence of Anionic Surfactants

Dispersions of Metal Oxides in the Presence of Anionic Surfactants

Tailoring the stability/aggregation of one-dimensional TiO₂(B)/titanate nanowires using surfactants

Synthesis of V-modified TiO₂ nanorod-aggregates by a facile microwave-assisted hydrothermal process and photocatalytic degradation towards PCP-Na under solar light

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Effect of surfactants on the aggregation and stability of TiO2 nanomaterial in environmental aqueous matrices

Cited by 47 publications

References 35 publications

Dispersions of Metal Oxides in the Presence of Anionic Surfactants

Dispersions of Metal Oxides in the Presence of Anionic Surfactants

Tailoring the stability/aggregation of one-dimensional TiO2(B)/titanate nanowires using surfactants

Synthesis of V-modified TiO2 nanorod-aggregates by a facile microwave-assisted hydrothermal process and photocatalytic degradation towards PCP-Na under solar light

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Product

Resources

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Tailoring the stability/aggregation of one-dimensional TiO₂(B)/titanate nanowires using surfactants

Synthesis of V-modified TiO₂ nanorod-aggregates by a facile microwave-assisted hydrothermal process and photocatalytic degradation towards PCP-Na under solar light