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In this research, we reported a cost-effective and an environmentally friendly technique for synthesis of gold nanoparticles supported on alumina (Al 2 O 3 /AuNPs) using  Tabebuia aurea  leaf extract (TAE) as non-toxic reducing agent, efficient stabilizer, and weak base source without adding any surfactants. Al 2 O 3 /AuNPs was characterized using various techniques including UV-Visible Spectrophotometer, Fourier-transform Infrared (FT-IR) spectroscopy, X-Ray diffraction (XRD), and Particle Size Analyzer (PSA). AuNPs was successfully synthesized using HAuCl 4  as precursor. The characterization of UV-Vis Spectrophotometer shows that AuNPs colloidal was formed at 0.15 % TAE. FTIR characterization of Al 2 O 3  shows Al-OH band at 1505 cm −1  and Al-O band at 680 cm −1 . Phase of Al 2 O 3  was amorphous confirmed by XRD. The particle size distribution average of Al 2 O 3 /AuNPs was about 43 nm. The reduction percentage of methylene blue using Al 2 O 3 /AuNPs catalyst was 70.41 % for 120 min.

Gold nanoparticles supported on Al2O3 using Tabebuia aurea leaf extract and catalytic properties for methylene blue reduction