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Effect of Temperature, pH, and Pb(II) Ions on the Dispersion Behavior of Dilute Colloidal Bentonite Nanoclay

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Abstract:

This study examined the influence of pH (4, 7, 10), temperature (20 °C, 30 °C, 40 °C), nanoparticle concentration (13 ppm, 26 ppm), and Pb²⁺ addition (0 , 7 ppm) on the dispersion behavior of bentonite nanoclays in water. Using light scattering techniques, the hydrodynamic radius, zeta potential, and diffusion coefficient were measured. Results showed pH as the primary control, with aggregation highest at neutral pH and stability greatest under basic conditions. Concentration changes modestly influenced dispersion, while Pb²⁺ reduced stability through electric double layer compression and induced precipitation at high pH. Temperature effects were minimal. The results highlight the importance of pH and ionic environment in regulating nanoclay behavior and stability, with implications for its use in water treatment and remediation systems.

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Periodical:

Key Engineering Materials (Volume 1044)

Pages:

93-99

DOI:

https://doi.org/10.4028/p-B9BjZL

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Online since:

March 2026

Authors:

John Aldus T. Dado, Alvin R. Caparanga, Jeremiah C. Millare*

Keywords:

Bentonite Nanoclays, Diffusion Coefficient, Hydrodynamic Radius, Light Scattering Techniques, Zeta Potential

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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