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Issue
Korean Journal of Chemical Engineering,
Vol.34, No.1, 41-53, 2017
Structural evolution of hierarchical porous NiO/Al2O3 composites and their application for removal of dyes by adsorption
Rong J, Zhang T, Qiu F, Chen M
Hierarchical porous NiO/Al2O3 composites were successfully prepared by two-steps. First, the core-shell structured Al2O3 microspheres were prepared via a template-free hydrothermal route using KAl(SO4)2·12H2O and Al2(SO4)3·18H2O as aluminum source. Then, the NiO/Al2O3 composites with micro- and nano-hierarchical structures were prepared by a hydrothermal method combining the subsequent calcination process. The obtained characterization result presented that the morphology of hierarchical Al2O3 microsphere tuned to irregular platelets by simply varying Ni/Al ratios. The BET analysis showed that the special surface area from 52.12m2 g-1 to 214.8m2 g-1 after two hydrothermal complex process. Effects of Ni/Al ratio, adsorbent dosage, Congo red (CR) concentration, coexisting ions, adsorption time and temperature were investigated. The obtained results indicated that NiO/Al2O3 composite had the high adsorption efficiency (99.6%) and great adsorption capacity (186.9mg g-1) under the optimum conditions. The adsorption isotherm and kinetics data were found to be well fitted and in good agreement with the Langmuir isotherm model and pseudo-second order model, respectively. The hierarchical porous NiO/Al2O3 composites presented remarkably higher adsorption efficiency during five recycling, which showed their potential as the highly efficient adsorbent for removal of CR in wastewater.
Keywords: NiO/Al2O3; Hierarchical Porous Material; Congo Red; Adsorption
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[Cited By]
  1. Kong L, Li Y, Qin F, Zhang T, Guo Q, Zhang X, Yang D, Xu J, Xue M, Journal of Industrial and Engineering Chemistry, 58, 369, 2018
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