Production of nanostructured γ-alumina from aluminum foundry tailing for catalytic applications

Abstract

Aluminum production industry tailings are considered as hazardous solid wastes accompanied by a variety of serious disposal, environmental, and public health issues. This study is devoted to presenting a promising solution for dealing with such problems. Within the scope of the present study, synthesis of nanostructured γ-alumina from aluminum foundry tailing using a novel process was presented. The proposed process will provide a multilateral advantage to both environment and industries. Firstly, the amount of tailing and accordingly, disposal cost could be partly lessened; secondly, the environmental pollution can be reduced, and finally, if possible, green production of advanced materials from this kind of waste at a rational expense can bring about the conservation of natural sources and also gain economic benefits. Characterization of the as-synthesized products was performed using X-ray diffractometry (XRD), X-ray fluorescence (XRF), Fourier-transform infrared (FTIR) spectroscopy, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDAX), and dynamic light scattering (DLS) for crystalline phase analysis, chemical composition, chemical bond recognition, morphology, elemental analysis, and particle size distribution, respectively. The chemical composition analyzed by XRF indicated that the as-synthesized alumina exhibits a purity of more than 97 wt%. The XRD pattern majorly possessed characteristic peaks related to the gamma phase of alumina. Microstructural analyses by FESEM and TEM confirmed the nano-sized morphology of the as-synthesized γ-alumina.

Synergistic effect of metals and cross linkers on surface modification of iron aluminum oxyhydroxide‐PVA polymer films for enhanced catalytic activity in transesterification reaction

“…The absorption bands at 3225 and 1326 cm −1 correspond to the stretching and bending vibrations of ‐CH and ‐CH 2 groups. The broad band at 1056 cm −1 indicates symmetric bending of Al‐O‐H, and the band at 822 cm −1 is due to vibrations of Al‐O‐Al bending mode 22 . The stretching vibration of ‐OH is responsible for the band at 3406 cm −1 .…”

“…The broad band at 1056 cm À1 indicates symmetric bending of Al-O-H, and the band at 822 cm À1 is due to vibrations of Al-O-Al bending mode. 22 The stretching vibration of -OH is responsible for the band at 3406 cm À1 . The band at 1642 cm À1 is attributed to the symmetric bending of C=O in FeOOH, 23 and the bending vibration of FeOOH gives rise to the bands at 528 cm À1 .…”

Understanding fluoride adsorption from groundwater by alumina modified with alum using PHREEQC surface complexation model

“…The peaks at 1128 cm -1 and 1132 cm -1 in A3 and A2 respectively signify the triply degenerative vibrational mode of sulphate ion because of the surface modification of the aluminium sulphate 33 . The peak appearing at 1029 cm -1 in A1 is due to the symmetrical bending vibration of Al–O–H group 34 . The band observed at 720 cm -1 and 715 cm -1 A3 and A1 respectively corresponds to the stretching vibrations of the aluminium-oxygen (Al-O) bonds in the crystal lattice structure of the material.…”

Synthesis of Al/starch co-doped in CaO nanoparticles for enhanced catalytic and antimicrobial activities: experimental and DFT approaches

“…Due to the Al–OH group stretching vibration, a large band appeared at around 3639 cm −1 . 33 The band at 3434 cm −1 was assigned to the H–O–H bending vibration caused by adsorbed water molecules. 34 The bands at 1411, 864, and 702 cm −1 represented the Ca–OH, Ca–O, and C–O stretching vibration, correspondingly, 35 which indicates the presence of CaO.…”