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Abstract
Ammonium bisulfite as a precipitating agent was used to synthesize basic aluminum sulfate (BAS) by homogeneous precipitation. Aluminum sulfate in aqueous solution was used as the raw material. High concentration of the precipitant agent promotes the formation of ammonium alunite, which was confirmed by XRD, TG/DTG and FTIR analysis. The ammonium alunite has less sulfate ions and more water than the BAS, and so, the ammonium alunite heat treated up to 1200°C produces 28 weight percent of Al2O3. In comparison the BAS generates 48 weight percent of Al2O3 as a final product. Homogeneous precipitation promotes the formation of amorphous spherical particles of basic aluminum sulfate and lamellar crystalline particles of ammonium alunite which were observed by field emission microscopy (FEM).
Highlights
Basic aluminum sulfate (BAS) has been used widely as precursor material for preparation of pseudoboehmite, activated alumina (γ-Al2O3), catalysts and special ceramic products [1,2,3]
The synthesis of BAS by homogeneous precipitation can be made by heating a mixture of aqueous solutions of an economical precipitant agent and aluminum salt up to its approximate boiling temperature
Ammonium alunite and basic aluminum sulfate can be synthesized by homogeneous precipitation varying the ammonium bisulfite used as a precipitant agent
Summary
Basic aluminum sulfate (BAS) has been used widely as precursor material for preparation of pseudoboehmite, activated alumina (γ-Al2O3), catalysts and special ceramic products [1,2,3]. Several methods are available for synthesis of BAS (sol-gel, microwave, homogeneous precipitation, hydrothermal synthesis, etc.). Sugimoto et al, discussed the standard formation process of monodisperse microcrystal of BAS by the sol gel method under acidic condition at 100°C for 3 days. The synthesis of BAS by homogeneous precipitation can be made by heating a mixture of aqueous solutions of an economical precipitant agent (urea, urea-ureasa, Na2CO3, ammonium carbonate, formamide, etc.) and aluminum salt up to its approximate boiling temperature. This precipitation process is carried out in a short time and appears to be industrially advantageous [7, 8]. An excess of urea promotes the formation of the oxide-hydroxides (boehmite) by increasing the pH above 9 [9, 10]
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