Mesoporous silica of SBA-15 and SBA-16 were successfully synthesized via the surfactant templating technique using tetraorthosilicate (TEOS) as the silica source and both surfactants, pluronic P123 and F127. Two different modified carbon paste electrodes (MCPE) were fabricated; SBA-15/MCPE and SBA-16/MCPE in compared to unmodified electrode, carbon paste electrode (CPE), for ascorbic acid (AA) and uric acid (UA) determination. Due to the unique properties of mesoporous silica materials, the MCPE fabricated exhibits greater surface enhancement effect, offers better adsorption and increases the response signals of AA and UA towards both MCPEs compared to CPE. The electrochemical behaviours of AA and UA were investigated using cyclic voltammetry. Finally, the electrochemical methods were successfully applied in detection of AA and UA.Keywords: mesoporous silica, electrochemical sensor, SBA-15, SBA-16, synthesis, electrochemical methods AbstrakMesoporus silika SBA-15 dan SBA-16 telah disintesis dengan jayanya melalui teknik templat surfaktan menggunakan tetraortosilikat (TEOS) sebagai sumber silika dan kedua-dua surfaktan, Pluronic P123 dan F127. Dua elektrod pes karbon yang dimodifikasi (MCPE) yang berbeza, SBA-15/MCPE dan SBA-16/MCPE telah dihasilkan dan dibandingkan dengan elektrod pes karbon yang tidak dimodifikasikan (CPE), untuk penentuan asid askorbik (AA) dan asid urik (UA). Dengan sifat-sifat unik bahan silika, MCPE yang telah difabrikasi mempamerkan peningkatan efek permukaan yang baik, penjerapan yang lebih bagus, dan peningkatan signal respon AA dan UA terhadap kedua-dua MCPE berbanding CPE. Perlakuan elektrokimia AA dan UA telah dikenalpasti dengan menggunakan alat voltametri berkitar. Akhirnya, kaedah elektrokimia telah berjaya diaplikasikan dalam pengesanan AA dan UA.
Silica was extracted from power plant bottom ash by alkali fusion method and used to synthesize MCM-41 and SBA-15. As comparison, MCM-41 and SBA-15 were synthesized by using tetraethylorthosilicate (TEOS) as pure silica source. All synthesized MCM-41 and SBA-15 were characterized using X-ray Diffraction (XRD) and nitrogen adsorption to determine the formation of hexagonal pores, Field Emission Scanning Electron Micrograph (FESEM) was used to observe their morphology while Fourier Transform Infrared Spectroscopy (FTIR) was used to obtain the functional group and removal of surfactant after calcinations. XRD results confirmed bottom ash MCM-41 (BA MCM-41), pure SBA-15 (PSBA-15) and bottom ash SBA-15 (BA SBA-15) have well-ordered mesostructures. N 2 adsorption of pure MCM-41 (PMCM-41), PSBA-15 and BA SBA-15 indicated type IV isotherm while BA MCM-41 exhibit type III isotherm. According to FESEM analyses, the particle morphology of bottom ash mesoporous silica was different from those prepared using pure chemical. Morphology of PMCM-41 and PSBA-15 showed rod like particle while BA MCM-41 and BA SBA-15 exhibited agglomerated particle. PMCM-41, PSBA-15 and BA SBA-15 shows ordered hexagonal, high surface area and narrow pore distribution. Keywords: mesoporous silica, MCM-41, SBA-15Abstrak Silika telah diekstrak daripada abu bawah loji janakuasa melalui kaedah gabungan alkali dan digunakan untuk sintesis MCM-41 dan SBA-15. Sebagai perbandingan, MCM-41 dan SBA-15 telah disintesis dengan menggunakan tetraetilortosilika (TEOS) sebagai sumber silika tulen. Semua MCM-41 dan SBA-15 yang telah disintesis dicirikan menggunakan kaedah pembelauan Sinar X (XRD) dan penjerapan nitrogen untuk menentukan pembentukan liang heksagon, mikroskopi elektron pengimbasan pancaran medan (FESEM) digunakan untuk memerhati morfologi manakala Spektroskopi Inframerah Tranformasi Fourier (FTIR) digunakan untuk mengenalpasti kumpulan berfungsi dan penyingkiran surfaktan selepas pengkalsinan. Keputusan XRD membuktikan debu MCM-41 (BA MCM-41), SBA-15 tulen (PSBA-15) dan debu SBA-15 (BA SBA-15) mempunyai mesostruktur yang teratur. Penjerapan N 2 oleh MCM-41 (PMCM-41), PSBA-15 dan BA SBA-15 menunjukkan isoterma jenis IV manakala isoterma jenis III bagi BA MCM-41. Berdasarkan analisis FESEM, morfologi zarah silika mesoporos daripada debu bawah loji janakuasa adalah berlainan berbanding yang disediakan menggunakan bahan kimia tulen. Morfologi PMCM-41 dan PSBA-15 menunjukkan zarah jenis rod manakala BA MCM-41 dan BA SBA-15 wujud sebagai zarah bercampur. PMCM-41, PSBA-15 dan BA SBA-15 mempunyai struktur heksagon yang seragam, luas permukaan yang tinggi dan taburan liang yang kecil. Kata kunci: silika mesoporos, MCM-41, SBA-15 ISSN -2506Nurul Barakah et al: SYNTHESIS AND CHARACTERIZATION OF MESOPOROUS SILICA MCM-41 AND SBA-15 FROM POWER PLANT BOTTOM ASH 540 Introduction In year 1990s, the researchers of Mobil Corporation discovered MCM-41 molecular sieves can be synthesized by using an inorganic silicate species and organic template [1]. Tetraethylor...
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