Synthesis and characterization of silica mesoporous materials from barley bran for removal of methylene blue

M. Raoui, O. Mohammedi, N. Bouchenafa-Saib


Abstract: The recovery and reuse of natural resources can lead to an important economy in the synthesis of materials. In order to prepare meso-structured materials, silica is an essential precursor. This study aims to find a new and less expensive source of silica to replace the one being used currently. It was mainly focused on the synthesis of organized mesoporous silica catalysts (OMS) by the sol-gel process. The bio-SBA-15 was synthesized using Algerian natural resources, such as barley bran and the extracted white powder was characterized by Fourier transform infrared spectroscopy (FTIR). This resulted in the presence of peaks as well as the XRF data proving the presence of silica in the extracted white powder with majority amounts, superior than 98.4%. Therefore, the prepared mesoporous samples were characterized by the different physicochemical methods (x-ray diffraction XRD, scanning electron microscopy SEM, N2 physisorption, and transmission electron microscope TEM) in order to determine the structural and textural properties of the material. The type IV adsorption isotherm with hysteresis and X-ray diffraction results obtained for bio-SBA-15 show that the mesoporous material exhibited similar results to the material SBA-15 synthesized with the same method with a classic source of silica with a high surface specific area 635 m2/g and a pore volume diameter of 0.668 nm. Different parameters were studied to examine the adsorption performance, such as the effect of adsorbent material dosage, initial concentration dye of MB, and pH. Langmuir and Freundlich adsorption models which were recorded to define the equilibrium isotherms. The results show the good efficiency of Methylene Blue adsorption onto bio-SBA-15.

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