Analysis of texture characteristics of modified and activated navbahor bentonite

The method of modification and activation of bentonite of Navbahor district of the Republic of Uzbekistan is considered in the work. The purpose of the work is to modify and activate Navbahor bentonite and study the texture characteristics. To obtain Fe-modified bentonite by the Zol-gel method, an aqueous suspension of bentonite (ratio of solid and liquid phases 1:10, aqueous extract of the suspension pH i 8) was left to soak for one day at room temperature. It was then treated with ultrasound at a frequency of 22 Gts for good dispersion of the bentonite particles for 3 min. The intercalating solution was prepared by mixing 1.0 M solutions of iron (III) chloride and sodium hydroxide. ([OH-]/[Fe3+]=2,0) and left at room temperature for one day. The sol obtained after ageing was added dropwise to a 10% aqueous suspension of bentonite. The resulting modified bentonite was separated from the liquid phase in a Büchner funnel using a vacuum pump after 24 h. It was washed with distilled water until a negative reaction to the chloride ions and dried at room temperature. It was then thermally treated at 500°C for 2 h. The method of obtaining hand-modified bentonite is carried out according to a similar method of obtaining Fe-modified samples.

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