Name of Participant: IZZATI BINTI MOHMAD NASIR
Name of Presenter: Miss IZZATI BINTI MOHMAD NASIR
Address: FBKT, UNIVERSITI MALAYSIA KELANTAN, Kelantan, Malaysia
Job: Student
Participant ID : MST 009
Mode of Presenter (Requested): Poster Presenter
Scope/Category: Materials Science and Technology
Attendance Mode: Online
Mode of Presenter (Given) : Oral Presenter
Paper Title:
Characterisation of Silica Extracted from Rice Husk  Functionalised by Guanine (RHACGua)
Abstract :

IZZATI Mohmad Nasir1,a,* and NADIAH Ameram1,b

1Faculty of Bioengineering and Technology, University Malaysia Kelantan, Jeli, Kelantan, Malaysia

aizzati95nasir@gmail.com, bnadiah@umk.edu.my

Abstract. This study seeks to answer how the incorporation of guanine affects the structural properties of the silica support. This study presents the characterisation of an organic-inorganic hybrid catalyst, named as RHACGua, derived from silica extracted from rice husk (RH). The catalyst was developed by incorporating guanine onto rice husk ash (RHA)-supported silica, utilizing (3-chloropropyl) triethoxysilane (CPTES) as an anchoring agent to facilitate the binding of guanine to the silica. Characterisation of RHACGua was performed using scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), powder x-ray diffraction (XRD), nitrogen sorption analysis, and solid-state nuclear magnetic resonance (NMR) spectroscopy for 29Si and 13C. SEM, XRD, and nitrogen sorption analyses revealed that RHACGua possesses a porous agglomerate structure with a specific surface area of 77.67 m²/g and a pore diameter of 15.81 nm. FTIR spectra demonstrated a shift in the Si-O￾Si band from 1038 cm⁻¹ in the precursor RHACCl to 1042 cm⁻¹ in RHACGua, confirming the successful incorporation of guanine and the presence of all expected functional groups. MAS NMR spectroscopy identified distinct silicon environments (Q4, Q3, T3, T2) in RHACGua, indicating effective modification of the Cl functional group with guanine. These findings confirm that the RHACGua catalyst was successfully synthesized via the modification of RHACCl with guanine, showcasing its potential for use in heterogeneous catalysis.

Keywords: Rice Husk, Heterogeneous Catalyst, Organic-inorganic Hybrid Catalyst, and Guanine