Redispergation of TiO2 particles in aqueous solutions

Yaremko, Z. M.; Tkachenko, Nataliya H.; Bellmann, Cornelia; Pich, Andrij

doi:10.1016/j.jcis.2005.09.044

Cited by 27 publications

(13 citation statements)

References 7 publications

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“…(34) is used to calculate both ΔG vdW,ta and ΔG vdW,tt . In literatures, the Hamaker constant around 10 kT (4.11 Â 10 -20 J) is used for both TiO 2 and algae [59][60][61]. Thus, the Hamaker constant 4.11 Â 10 -20 J for the interaction between algae and TiO 2 is used to estimate ΔG vdW,ta .…”

Section: Gibbs Energy Of Interactionmentioning

confidence: 99%

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Lin

Tseng²,

Huang

2015

Front. Chem. Sci. Eng.

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Nano-sized titanium dioxide (nano-TiO 2 ) has wide industrial applications and therefore considerable chances of exposure are created for human beings and ecosystems. To better understand the interactions between nano-TiO 2 and aquatic organisms, we first studied TiO 2 uptake by algae exemplified by Pseudokirchneriella subcapitata. P. subcapitata were exposed to nano-TiO 2 in a series of concentrations and at various pH. TiO 2 uptake was quantified using a sedimentation curve analysis technique. After exposure of algae to TiO 2 , the variation of zeta potential was measured and the morphology of algae-TiO 2 aggregate was observed with scanning electron microscopy and the optical microscopy. The steady-state TiO 2 uptake was found to be pH-dependent and the isotherms can be described well by Freundlich model. TiO 2 deposited on algal surfaces causes the shift of pH zpc of TiO 2 -covered algae from that of algae toward that of TiO 2 . The attraction between TiO 2 -covered algal cells induces the agglomeration of algae and TiO 2 and thus the formation of algae-TiO 2 aggregates in the size of 12 to 50 µm. The 2-D fractal dimension of the aggregates is pHdependent and ranges from 1.31 to 1.67. The theoretical analysis of the Gibbs energy of interaction indicates that both TiO 2 uptake by algae and the formation of algae-TiO 2 aggregate are influenced by the interaction between TiO 2 particles.

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Section: Gibbs Energy Of Interactionmentioning

confidence: 99%

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Lin

Tseng²,

Huang

2015

Front. Chem. Sci. Eng.

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show abstract

“…Many studies have focused on the dispersion stability of TiO 2 particles in water [4][5][6]. Surface modification of TiO 2 nanoparticles is an effective method to minimize the agglomeration of TiO 2 particles [7][8][9]. Silane alkoxides with organic functional groups also have been widely used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dispersion stability and photocatalytic activity of TiO2 particles fluorinated by fluorine gas

Kim

Nishimura

Yonezawa

et al. 2012

Journal of Fluorine Chemistry

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“…But practical applications of TiO 2 nanomaterials are hindered due to a number of problems, one of which is the spontaneous agglomeration of TiO 2 nanoparticles when dispersed in aqueous media, resulting in a rapid decrease in specific surface area, thus photocatalytic activity. The agglomeration behavior of TiO 2 particles in the aqueous phase has been studied previously [6][7][8][9]. Unfortunately, the potentially important effects of agglomeration on subsequent adsorption/photoreaction have not been considered in experiments despite mounting evidence that agglomeration is the rule rather than the exception [6].…”

Section: Introductionmentioning

confidence: 99%

“…The agglomeration process is strongly dependent on parameters, such as ionic strength and pH, of the suspension [6,12]. To minimize the agglomeration of TiO 2 particles, strategies such as surface modification [7,[13][14][15][16][17][18] and adjustment of the system pH [19][20][21] have been reported. The idea is to stabilize colloidal TiO 2 particles by enabling their surfaces to carry electric charge to create electrostatic repulsive forces to repel each other.…”

Section: Introductionmentioning

confidence: 99%

Effect of the agglomeration of TiO2 nanoparticles on their photocatalytic performance in the aqueous phase

Fan

et al. 2010

Journal of Colloid and Interface Science

148

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Redispergation of TiO2 particles in aqueous solutions

Cited by 27 publications

References 7 publications

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Enhanced dispersion stability and photocatalytic activity of TiO2 particles fluorinated by fluorine gas

Effect of the agglomeration of TiO2 nanoparticles on their photocatalytic performance in the aqueous phase

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