Add time:07/28/2019         Source:sciencedirect.com

The hydrolysis kinetics of aluminum and zirconium oxychloride salts in the presence of carbamide was investigated. The determined rate constant varies in the range of 0.0027–0.0038 min−1 and is independent on initial mixture composition. The effect of initial components molar ratio and concentration on formation of sol particles was established. As a result, zirconium and aluminum oxyhydroxide 25–44 nm particles were obtained during sol–gel synthesis. It was found that particle size strongly depends on synthesis conditions. In addition, synthesis conditions determine porosity of final sample and allow to obtain highly porous material at certain conditions. The formation of porous oxyhydroxides structure via particles aggregation with formation of aggregates 60 nm ÷ 1–10 μm was confirmed. The specific surface area of samples varies from 85 to 540 m2/g depending on composition and synthesis conditions The carbamide effect on zirconium oxyhydroxide gelation process was studied.

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