access icon free Sol–gel preparation of spherical γ-Al2O3 with macro-mesopores as an efficient adsorbent for acid fuchsin

Spherical gamma-alumina (γ-Al2O3) has a wide range of applications in the field of adsorption due to its low bulk density, larger pore size, higher strength and thermal stability. In this study, spherical γ-Al2O3 with macro-mesopores was prepared with isopropanol aluminium as the aluminium source via a sol–gel process. Spherical γ-Al2O3 was characterised by means of nitrogen adsorption and desorption curve, scanning electron microscope, transmission electron microscope, X-ray diffraction and so on. The adsorption performance of the prepared spherical γ-Al2O3 was studied by probe experiment of adsorption of acid fuchsin (AF) solution. The results showed that the spherical γ-Al2O3, which was prepared under the condition of hydrolysis time of 1 h, hydrolysis temperature of 85°C, ageing temperature of 95°C and ageing time of 7 h, had the strongest adsorption capacity for AF, and the adsorption efficiency could reach 96.24% in 40 mg/l AF solution. In addition, after six cycles of use, the spherical γ-Al2O3 had no damage and the adsorption efficiency still could reach 88.40%. This work provides a feasible method for the preparation of spherical γ-Al2O3, and could also help to understand the connection between its textural properties and adsorption performance.

Inspec keywords: mesoporous materials; nitrogen; X-ray diffraction; thermal stability; adsorption; organic compounds; texture; transmission electron microscopy; scanning electron microscopy; sol-gel processing; desorption; alumina; ageing

Other keywords: nitrogen adsorption-desorption curve; spherical γ-Al2O3; sol-gel preparation; adsorption efficiency; ageing time; larger pore size; Al2O3; thermal stability; temperature 95.0 degC; ageing temperature; time 1.0 hour; X-ray diffraction; scanning electron microscopy; temperature 85.0 degC; higher strength; macropores; time 7.0 hour; transmission electron microscopy; acid fuchsin solution adsorption; low bulk density; textural properties; mesopores; hydrolysis temperature; N

Subjects: Deposition from liquid phases (melts and solutions); Structure of powders and porous materials; Cold working, work hardening; post-deformation annealing, recovery and recrystallisation; textures; Adsorption and desorption kinetics; evaporation and condensation; Sorption and accommodation coefficients (surface chemistry); Other heat and thermomechanical treatments

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