Low-Cost Solvothermal Synthesis of Hierarchical Structure γ-AlOOH and its Application to Remove Cr (VI), Methyl Orange and Congo Red from Contaminated Water
Leaf-like hierarchical γ-AlOOH was prepared by a facile template-free solvothermal
method at 150°C for 6 h, using aluminum nitrate (Al (NO3)39H2O) as aluminum source and a mixed
water/ethanol solution as solvent. The obtained sample was characterized by X-ray powder diffraction
(XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and N2 adsorption/
desorption technique. Experiment results indicated that the obtained leaf-like hierarchical γ-AlOOH exhibited a BET surface area of 190.3 m2/g and an average pore widths of 18.82 nm. The hierarchical
γ-AlOOH showed excellent removal efficiency for Cr (VI), Methyl orange and Congo red with maximum adsorption
capacity of 7.4 mg/g, 59.9 mg/g and 99.0 mg/g, respectively.
Keywords: Adsorption, γ-AlOOH, hierarchical structure, leaf-like, solvothermal method.
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