![]() Journal of Colloid Science and Biotechnology, 3(1): 1–10. Nanoparticle properties, behavior, fate in aquatic systems and ucharacterization methods. Do nanoparticles present ecotoxicological risks for the health of the aquatic environment ?. Silica nanoparticles separation from water : Aggregation by cetyltrimethylammonium bromide (CTAB). Liu, Y., Tourbin, M., Lachaize, S., and P.Silica nanoparticle separation from water by aggregation with AlCl 3. Simulation of the interaction between silica surface and acid or alkaline aqueous media. Chemistry of silica solubility, polymerization, colloid and surface properties, and biochemistry, A Wiley-Interscience Publication, Canada, 11,563. Chemical Control of Highly Porous Silica Xerogels : Physical Properties and Morphology, Chem. Toxic effects of silica nanoparticles on zebrafish embryos and larvae, PLoS ONE 8(9): 4–12. Duan, J., Yu, Y., Shi, H., Tian, L., Guo, C., Huang, P., Zhou, X., Peng, S., and Z.Advances in Colloid and Interface Science, 102: 475–502. Catalytic effect of magnesium ions on silicic acid polycondensation and inhibition strategies based on chelation. Environmental Impact Assessment Review, 24: 711–732. Non-regulated water contaminants : emerging research. Journal of Environmental Management, 85: 1009–1014. Nanoparticles in wastewater from a science-based industrial park - Coagulation using polyaluminum chloride. Molecular Structures of Al/Si and Fe/Si Coprecipitates and the Implication for Selenite Removal. Chan, Y., Kuan, W., Tzou, Y., Chen, T., Liu, Y., Wang, M., and H.Stability and flocculation of nanosilica by conventional organic polymer. In conclusion, results suggests that pH does influence the surface charge of SiO 2 NPs and affect the stability behavior and its interaction processes in aqueous suspensions. The mean particle size at pH PZC in DI water is measured at 1750 nm larger compared to the mean particle size in tap water indicating that the presence of other ions in tap water suppressed the aggregation process. ![]() ![]() It was found that both in DI water and tap water, SiO 2 NPs aggregated and increased in particle size but reduced in surface charge when pH slowly decreased towards their respective pH PZC from the initial pH by adding 0.25M of hydrochloric acid. The initial pH was discovered at 7.1 in tap water with a mean particle size of 346 nm and an average surface charge value of -27 mV compared to initial pH of DI water which was 5.4 with mean particle size of 295 nm and an average surface charge value of -33 mV. DLS analysis identified both pH values of the point of zero charge (pH PZC) of SiO 2 NPs in DI water and tap water at pH 3.2 and pH 2.8 respectively. In this study, dynamic light scattering (DLS) technique was applied to characterize SiO 2 in terms of surface charge and particle size as a function of pH within the range of 2 to 11 to analyze the aggregation behavior and significance of the intermolacular interactions in deionized (DI) water and tap water. The removal of SiO 2 nanoparticles (NPs) from water still remains a challenge due to its small size and unknown interactions within the water body. Silicon dioxide (SiO 2) in nanoscale had been detected as waste product in river water for the past two decades and it is recently proven to have adverse effects toward human and animal health, the ecosystem and water treatment system.
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