Preparation of Alumina Nanorods from Chromium-Containing Alumina Sludge

Abstract

Alumina nanorods were prepared from chromium-containing alumina sludge, and the effects of doping elements, such as Cr, Fe, and Mg, were researched. The results show that the crystal transformation of alumina is restricted by the doped Cr and facilitated by the doped Fe and Mg, which is transformed from θ-Al2O3 to α-Al2O3 in the calcination process. Meanwhile, the crystal transformation of alumina is strongly restrained by co-doped elements from the chromium-containing alumina sludge. The doped elements change the course of phase structure transformation and slightly transform the chemical bond of the alumina nanorods. The impure elements are doped in the alumina crystal and restrain the crystalline growth of alumina nanorods according to the rules. In the sample prepared from chromium-containing alumina sludge, more Cr and Mg but fewer Fe are doped, and most Cr are existed as Cr(III). It is possible that the Fe-doping is confined by the competition of Cr and Mg. Moreover, the lattice imperfection of alumina is caused by doped ions, such as Cr, Fe, and Mg, and the chemical state of O and Al are affected. The findings by these experiments provide essential information for eliminating pollution and promoting comprehensive utilization of the chromium-containing alumina sludge.

High-Energy-Storage Dielectric Performance of Sandwich PI-Based Composite over a Wide Temperature Range

“…Figure b shows the FTIR spectra of the films. The characteristic imide absorption peaks of asymmetrical and symmetrical CO stretching, C–N stretching, and CO bending of the imide ring were observed at 1777.44, 1717.16 cm –1 , and 1368.54 and 719.49 cm –1 in all of the films. , And the characteristic peaks of aluminum (432.80, 564.17 cm –1 , α-Al 2 O 3 ) become more pronounced as the volume ratio of alumina increases. , And the content of 1DTiO 2 was low and failed to show the characteristic peak. Figure c shows the T g of all films at around 320 °C, indicating that the addition of alumina and titanium dioxide does not affect the structure of the PI itself.…”

“…26,27 And the characteristic peaks of aluminum (432.80, 564.17 cm −1 , α-Al 2 O 3 ) become more pronounced as the volume ratio of alumina increases. 28,29 And the content of 1DTiO 2 was low and failed to show the characteristic peak.…”

Severe visual loss caused by inhalational methanol poisoning in fireworks production: A report on 3 cases

“…Commercial alcohol products containing a high concentration of methanol are widely used as volatile solvents in many industrial factories 2 . Formic acid, the end‐product of methanol metabolism, directly inhibits the activity of cytochrome oxidase in mitochondria and interferes with adenosine triphosphate (ATP) production.…”