Comparative study of dispersion performance of the zinc and aluminum salt treated rutile titanium dioxides
In this paper,the effects of TiO2 concentration,pH of the dispersion system and surface ad-sorbed chemical ingredients on the zeta potential of the zinc and aluminum salt treated rutile titanium di-oxides produced by the manufacturer were systematically studied.The differences of the dispersion sta-bility of the zinc and aluminum salt treated rutile titanium dioxides were compared and analyzed.The results show that with the increase of dilution concentration,the dispersion of aluminum series becomes more and more stable,while that of zinc series becomes unstable.The pH of the dispersion solution in-creased from 4.0 to 10.0,and the zeta potential of the aluminum series primary product was more signi-ficant than that of the zinc series primary product,that is,the aluminum primary product was more eas-ily dispersed and stable.After surface desulphurization and dehydroxylation of primary products,the variation of zeta potential of aluminum and zinc series primary products with pH did not change,which proved that the surface adsorbed chemical ingredients were not the fundamental influencing factors of differences of dispersion of the two series primary products.It was further proved that Zn2+or Al3+dop-ing was the root cause of the difference of dispersion stability of the two series primary products through the single salt treatment and calcination test in the laboratory.Moreover,the calcination temper-ature had a significant effect on the surface charge of the primary products,and the effect on the alumin-um series primary product was more significant.
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