Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 99, Issue 1, Pages 158-168Publisher
SPRINGER
DOI: 10.1007/s10971-021-05559-1
Keywords
Nanocomposite; Al2O3-ZnAl2O4; Sol-gel; Spinel; Adsorbent
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ZnAl2O4/Al2O3 nanocomposites with different ZnAl2O4 contents were successfully prepared by sol-gel method for methylene blue removal. Heat treatment led to the crystallization of zinc aluminate spinel. The maximum MB removal rate of 70% was achieved under optimal conditions.
In this research, ZnAl2O4/Al2O3 nanocomposites with different ZnAl2O4 (30, 50, and 70 wt.%) were successfully prepared in one step by sol-gel method and utilized for the removal of methylene blue (MB). The structural properties of nanocomposites were investigated by X-ray diffraction (XRD), differential thermal analysis (DTA), FTIR analysis, Zeta potential, and BET. The obtained results showed the synthesized nanocomposites by sol-gel method were amorphous and heat treatment at 700 degrees C led to the crystallization of zinc aluminate spinel. The maximum MB removal (70%) was obtained under o9 ptimal conditions such as initial concentration of MB (10 mg/L), pH of solution (8.5), the amount of adsorbent (0.05 g), type of adsorbent (70 wt.% ZnAl2O4/Al2O3 nanocomposite). The average size of zinc aluminate crystals in the maximum amount of zinc aluminate in the composite (70 wt.%) was calculated to be 27 +/- 1 nm and its morphology changed from sheet to mass. The specific surface area of the nanocomposite was calculated to be 70 m(2)/g. The kinetics of adsorption was fitted with the pseudo-second order model.
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