Synthesis of Nanofiber‐like Mesoporous γ‐ Al 2 O 3 toward Its Adsorption Efficiency for Congo Red

Nanofiber‐like mesoporous γ‐ Al 2 O 3 was synthesized using freshly prepared boehmite sol in the presence of triblock copolymer, P123 following evaporation‐induced self‐assembly ( EISA ) process followed by calcinations at 400°C–1000°C. The samples were characterized by thermogravimetry ( TG ), differential thermal analysis ( DTA ), X‐ray diffraction ( XRD ), N 2 adsorption–desorption, and transmission electron microscopy ( TEM ). The adsorption efficiency of the samples with Congo red ( CR ) was studied by UV – vis spectroscopy. XRD results showed boehmite phase in the as‐prepared sample while γ‐ Al 2 O 3 phase obtained at 400°C was stable up to 900°C, a little transformation of θ‐ Al 2 O 3 resulted at 1000°C. The Brunauer‐Emmett‐Teller surface area of the 400°C‐treated sample was found to be 175.5 m 2 g − 1 . The TEM micrograph showed nanofiber‐like morphology of γ‐ Al 2 O 3. The 400°C‐treated sample showed about 100% CR adsorption within 60 min.