Synthesis of Fe3O4@SiO2@CS magnetic bio-nanocomposite by silica extracted from wheat straw for removal of Basic Red 46 dye from aqueous solutions

Document Type : Research Article


1 shahid beheshti university

2 Prof., Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran, Iran

3 Shahid Behesti university


In the present study, amorphous silica was successfully extracted from wheat straw by acid leaching technique using various acids including HCl, HNO3, H2SO4 and H3PO4 and was used in the synthesis of Fe3O4@SiO2 nanocomposite. Then, the synthesized nanocomposite were functionalized by chitosan functional group (CS) to obtain Fe3O4@SiO2@CS bionanocomposite. The percentages of the constituents, the crystallization state, the identification of the functional groups and the surface morphology of the produced materials were investigated using XRF, XRD, FT–IR, VSM, BET, SEM and zeta potential analyzes. Finally, the synthesized Fe3O4@SiO2@CS bionanocomposite was used for removal of Basic Red 46 dye from aqueous solutions as an efficient and effective adsorbent. The results showed that pure and active silica with purity of 96.52% was extracted from wheat straw using acid leaching with HNO3 acid. Also, the results of VSM analysis showed the superparamagnetic properties of Fe3O4@SiO2@CS bionanocomposite with magnetic properties of 17.55 emu g–1.In addition, the results of dye removal showed that the Basic Red 46 dye removal efficiency using synthesized Fe3O4@SiO2@CS bionanocomposite was 97% and adsorption capacity of it was 1700 mg g–1, which is much higher and desirable than many other adsorbents.


Main Subjects

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