Synthesis of γ-alumina (Al₂O₃) nanoparticles and their potential for use as an adsorbent in the removal of methylene blue dye from industrial wastewater

Abstract

Non-toxic nanomaterials have gained significant importance recently in the treatment of industrial wastewater that sometimes contains organic dyes such as methylene blue.

Synthesis, Characterization, and Modification of Alumina Nanoparticles for Cationic Dye Removal

“…In our case, the nano γ-Al 2 O 3 was easily synthesized by titrating NaOH into Al(NO 3 ) 3 without any other chemicals. The nano γ-Al 2 O 3 in this study achieved better morphology and much higher specific surface area than that in the paper [51]. For cationic dye adsorption, MTB was removed with removal efficiency of 98% while the removal efficiency of RhB using SMNA in this paper reached to 100% for the similar initial concentration of cationic dye.…”

“…The previously published paper by Ali el al. [51] successfully synthesized nano γ-Al 2 O 3 by a precipitant method in the presence of nonionic surfactant Tween-80. This procedure required the ultrasonication and washing with ethanol before calcination at 550 °C.…”

Complex Catalytic Materials Based on the Perovskite-Type Structure for Energy and Environmental Applications

“…The adsorption method has the advantage that it can be used for a large amount of water with low pollutants content using simple and relatively cheap operating systems [262]. The most commonly used adsorbents for the elimination of organic dyes from water are: activated carbon [263,264], alumina [265,266], bentonite [267,268] and zeolites [269]. The main drawbacks of these techniques are correlated to the adsorbents' capacity which decreases in time and the high costs of their regeneration.…”

Simplified waste-free process for synthesis of nanoporous compact alumina under technologically advantageous conditions

“…The IR spectra of the samples calcined at higher temperatures (400, 700, and 1100 C) only contained the n(Al-O) absorption band, conrming the presence of aluminium oxide. Moreover, the different numbers and positions of the n(Al-O) absorption bands indicated different modications of the nal products due to phase transformation from g-Al 2 O 3 through qÀAl 2 O 3 to aÀAl 2 O 3 , which are related to the different coordination of Al 3+ (hexa-coordinated AlO 6 , penta-coordinated AlO 5 and tetra-coordinated AlO 4 ), 8,9,[33][34][35][36] and is in accordance with the results of X-ray analysis (Fig. 4).…”