Effect of synthesis parameters on precipitation of nanocrystalline boehmite from aluminate solutions

Synthesis of high-surface-area γ-Al2O3 from aluminum scrap and its use for the adsorption of metals: Pb(II), Cd(II) and Zn(II)

“…Additionally, the principal peak located at ca. 18 • in the patterns of Gel 6-80 and Gel 7-80 was shifted to lower Bragg angles than similar peaks for gels aged at 25 • C. Three reasons have been proposed for this shift [16][17][18]: (i) specific stacking faults (involving a rotation of the layers in their planes and a displacement normal to the layers), (ii) limited layer stacking number and (iii) excess of water in the interlayer; this last hypothesis will be discussed in detail in the TGA section. Fig.…”

“…Okada et al [17] and Panias and Krestou [18] correlated the pH of precipitation of the gel to the crystallite size of the alumina formed. According to those authors, the crystallite sizes of the oxides increase with increasing pH, in both series of aluminas, aged at 25 • C and 80 • C (see Table 1).…”

Plasma electrolytic ceramic-like aluminum oxide coatings on iron

“…Aluminum hydroxide precipitation (Eq. 5) from aluminate solutions under various pH and temperature is studied in details in [17][18][19].…”

Influence of the Method of Aqueous Synthesis and the Nature of the Silicon Precursor on the Physicochemical Properties of Porous Alumina

“…[19][20][21][22] The cogelation method allows the synthesis of homogeneous supports from the hydrolysis and condensation of different precursors (metallic alkoxides or salts). In previous works, [29][30][31] homogeneous functionalized silica networks were obtained by the use of Si(OC 2 H 5 ) 4 ·(TEOS) as network-forming reagent and a functionalized silica precursor N- [3-(trimethoxysilyl)propyl]ethylenediamine (EDAS). Functionalized support through cogelation mechanisms have also proved to be possible with other precursors, for example functionalized phosphonates with titanium isopropoxide, or functionalized silicon alkoxide with titanium isopropoxide.…”