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ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Published monthly
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Green synthesis, characterization, and adsorption of Co(II) and Cu(II) ions from aqueous solution by mesoporous silica MCM-41
Raghad S. Hatem, Alaa F. Hussain, and Hayder H. Mihsen
Department of Chemistry, College of Science, University of Kerbala, Kerbala, Iraq
E-mail: Raghad.saad@uokerbala.edu.iq
Received: 27 February 2024 Accepted: 26 May 2024
Abstract: Rice husk (RH) is regarded as one of the most common agricultural residues worldwide. MCM-41 (Mobil Composition of Matter No. 41) is prepared from RH. RH can itself be transformed to sodium silicate through a reaction with NaOH solution. This study includes three steps, the first of which involves extraction of silica from RH using a leaching process in the presence of HNO3; the second and third involve generation of RH-SiO2 and MCM-41 from the extracted silica. Characterization of the synthesized compounds can be successfully achieved, via the use of various techniques including FT-IR, FESEM-EDX, TEM, N2-adsorption–desorption, XRD, and thermogravimetric analysis represented by TGA/DSC. The XRD and TEM investigation demonstrated that MCM-41 with an extremely ordered hexagonal arrangement was generated. The findings of the N2-adsorption–desorption analysis revealed that the average pore diameter, total pore volume, and MCM-41 specific surface area were 6.80 nm, 126.12 cm3 g−1 and 548.92 m2 g−1, respectively. Thermogravimetric analysis (TGA/DSC) of silica materials represented by both RH-SiO2 and MCM-41 revealed two mass reduction steps, where the initial step involved elimination of water adsorbed in physical/chemical processes on the silica surface, and the second involving the breakdown of Si–OH groups. The RH-SiO2 and MCM-41 were utilized for the adsorption of heavy pollutants like Cu(II) and Co(II) ions from aqueous solution.
Keywords: Adsorption; Mesoporouse materials; MCM-41; Rice husks; Surface area; Uptake metal
Full paper is available at www.springerlink.com.
DOI: 10.1007/s11696-024-03538-8
Chemical Papers 78 (11) 6331–6342 (2024)
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