Assessment of ζ-potential in TiO2 aqueous suspensions: A comparative study based on thermodynamic and rheological methods

Gómez-Merino, A.I.; Rubio-Hernández, F.J.; Aguiar, J. Albino

doi:10.1016/j.ceramint.2014.12.088

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…23,17.08, and 9.55 min, respectively. Compared with AlCl 3 and PAC, HPAC showed the strongest floc formation ability in the flocculation process.…”

mentioning

confidence: 94%

“…Thus, the coagulation process is actually aimed at breaking the original surface charge equilibrium and making the colloidal particles destabilize and settle. Zeta potential, known as the surface electric potential of colloidal particle, is one of the basic parameters affecting the colloidal stability of the system. , …”

Section: Introductionmentioning

confidence: 99%

“…Zeta potential, known as the surface electric potential of colloidal particle, is one of the basic parameters affecting the colloidal stability of the system. 17,18 In this study, single-molecule aluminum salt AlCl 3 , medium polymerized polyaluminum chloride (PAC), and high polymerized polyaluminum chloride (HPAC) were prepared in a laboratory. The particle size distribution, density, and hygroscopicity of prepared coagulants were characterized.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Neutralization Model and Floc Growth Kinetics Properties of Aluminum Coagulants Based on Sips and Boltzmann Equations

Wu¹,

Zhang²,

Zhou

et al. 2017

ACS Appl. Mater. Interfaces

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Single-molecule aluminum salt AlCl, medium polymerized polyaluminum chloride (PAC), and high polymerized polyaluminum chloride (HPAC) were prepared in a laboratory. The characteristics and coagulation properties of these prepared aluminum salts were investigated. The Langmuir, Freundlich, and Sips adsorption isotherms were first used to describe the adsorption neutralization process in coagulation, and the Boltzmann equation was used to fit the reaction kinetics of floc growth in flocculation. It was novel to find that the experimental data fitted well with the Sips and Boltzmann equation, and the significance of parameters in the equations was discussed simultaneously. Through the Sips equation, the adsorption neutralization reaction was proved to be spontaneous and the adsorption neutralization capacity was HPAC > PAC > AlCl. Sips equation also indicated that the zeta potential of water samples would reach a limit with the increase of coagulant dosage, and the equilibrium zeta potential values were 30.25, 30.23, and 27.25 mV for AlCl, PAC, and HPAC, respectively. The lower equilibrium zeta potential value of HPAC might be the reason why the water sample was not easy to achieve restabilization at a high coagulant dosage. Through the Boltzmann equation modeling, the maximum average floc size formed by AlCl, PAC, and HPAC were 196.0, 188.0, and 203.6 μm, respectively, and the halfway time of reactions were 31.23, 17.08, and 9.55 min, respectively. The HPAC showed the strongest floc formation ability and the fastest floc growth rate in the flocculation process, which might be caused by the stronger adsorption and bridging functions of Al and Al contained in HPAC.

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“…23,17.08, and 9.55 min, respectively. Compared with AlCl 3 and PAC, HPAC showed the strongest floc formation ability in the flocculation process.…”

mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption Neutralization Model and Floc Growth Kinetics Properties of Aluminum Coagulants Based on Sips and Boltzmann Equations

Wu¹,

Zhang²,

Zhou

et al. 2017

ACS Appl. Mater. Interfaces

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“…Even for a widely studied metal oxide like TiO 2 , measured ZP values range remarkably when using different experimental techniques . This highlights the complexity of NP/aqueous interfaces and the importance of developing efficient, yet simple methods that would not only enable the measurement of the ZP but also reveal underlying interfacial phenomena.…”

Section: Introductionmentioning

confidence: 99%

Zeta Potential Determination from Molecular Simulations

2020

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ζ-Potential (ZP) is among key physical properties characterizing the behavior of nanoparticles in colloidal solutions. Despite many attempts to calculate and neatly interpret the ZP, a full understanding of various factors influencing its values has not been achieved yet, even for standard metal oxides, particularly when considering high ionic concentrations and the effect of temperature. This contribution extends our recent work [Prědota, M. et al. Langmuir 2016, 32, 10189−10198], where we suggested a direct approach to calculate the ZP from nonequilibrium molecular dynamics (NEMD) simulations. Here, we investigate NaCl, RbCl, CaCl 2 , SrCl 2 , and Na 2 C 2 O 4 aqueous solutions interacting with TiO 2 and SiO 2 surfaces and show contrasting ZP behaviors of these metal oxides, elucidated by theoretical insights gained by molecular simulations. We show that both surface-specific and ion-specific properties play a key role in the observed electrokinetics. Additionally, we explore the concentration and temperature influence on the ZP of selected systems and discuss the measurement of the ZP of systems with surfaces and ions modeled using scaled partial charges. Our results agree well with available experimental data and capture all key ZP features predicted by theory or revealed by experiments and advance the microscopic description of solid/ liquid interfaces, promoting further applications of the suggested NEMD approach.

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Effective photodegradation of 2,4-dichlorophenoxyacetic acid on TiO2 nanocrystals anchored on SBA-15 mesoporous material

Silva

Lima

Costa

et al. 2022

Int. J. Environ. Sci. Technol.

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Assessment of ζ-potential in TiO2 aqueous suspensions: A comparative study based on thermodynamic and rheological methods

Cited by 7 publications

References 25 publications

Adsorption Neutralization Model and Floc Growth Kinetics Properties of Aluminum Coagulants Based on Sips and Boltzmann Equations

Adsorption Neutralization Model and Floc Growth Kinetics Properties of Aluminum Coagulants Based on Sips and Boltzmann Equations

Zeta Potential Determination from Molecular Simulations

Effective photodegradation of 2,4-dichlorophenoxyacetic acid on TiO2 nanocrystals anchored on SBA-15 mesoporous material

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