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Effect of process parameters on physicochemical characteristics of ordered mesoporous silica SBA-15

Effect of process parameters on physicochemical characteristics of ordered mesoporous silica SBA-15 / Koh Ming Hooi
Kesan parameter proses atas sifat fizikokimia SBA-15 silika mesopore tersusun telah disiasat. SBA-15 telah disintesiskan melalui kaedah templat halus menggunakan surfaktan tanpa-ionik Pluronic P123 dan tetraetilena orthosilikat TEOS sebagai sumber silika serta asid hidroklorik (HCl) sebagai pemangkin. Parameter proses yang diubah termasuklah konsentrasi HCl (2.5 – 1.0 M), suhu penuaan (40 – 70 °C) dan masa penuaan (12 – 48 jam). Sampel SBA- 15 yang disintesis telah diuji dengan eksperimen penjerapan metilena biru (MB) dan kondisi proses yang menghasilkan SBA-15 dengan prestasi terbaik adalah 2.0 M HCl, pada 40 °C dan 48 jam penuaan. Kecekapan penyingkiran metilena biru yang terbaik adalah sebanyak 19.63%. Pencirian fizikokimia dilakukan melalui teknik pengimbasan elektron mikroskopi (SEM) dengan tenaga serakan x-ray spektroskopi (EDX), transmisi elektron mikroskopi (TEM), BET analisis kawasan permukaan, perubahan inframerah spektrofotometer Fourier (FTIR), dan pembelauan x-ray (XRD). SBA-15 dengan prestasi penjerapan MB terbaik menunjukkan dinding mesopore setebal 6.98 nm, saiz liang sebesar 4.06 nm (cawangan penjerapan BJH), kawasan permukaan sebanyak 364.71 m2/g dengan kawasan permukaan liang mikro sekecil 42.29 m2/g. Turut diperhatikan dalam kajian ini adalah morfologi SBA-15 yang bertukar dari bentuk rod panjang ke rod pendek sehingga kemunculan campuran bentuk rod dan sfera apabila kepekatan HCl dikurangkan daripada 2.5 M ke 1.0 M. Apabila suhu penuaan dinaikkan daripada 40 ke 70 °C, SBA-15 berubah daripada struktur rod pendek ke struktur serat nipis. Masa penuaan yang diubah daripada 12 ke 48 jam tidak menunjukkan apa-apa kesan ke atas perubahan morfologi SBA-15. _______________________________________________________________________________________________________ Effect of process parameters on physicochemical characteristics of ordered mesoporous silica SBA-15 has been investigated. SBA-15 was synthesised by soft-templating method using non-ionic surfactant Pluronic P123 and tetraethyl orthosilicate TEOS as silica source with aqueous hydrochloric acid (HCl) as catalyst. Process parameters varied include HCl concentration (2.5 – 1.0 M), ageing temperature (40 – 70 °C) and ageing time (12 – 48 hours). The as-synthesised SBA-15 samples were tested with methylene blue (MB) batch adsorption experiments and the process conditions which produces SBA-15 with best adsorption performance is 2.0 M HCl, with ageing carried out at 40 °C for 48 hours, with methylene blue removal efficiency reported at 19.63%. Physicochemical characterisation of SBA-15 was carried out using scanning electron microscopy (SEM) with energy dispersive x-ray spectroscopy (EDX), transmission electron microscopy (TEM), BET surface area analysis, Fourier transform infrared spectrophotometer (FTIR) and x-ray diffraction (XRD) techniques. SBA-15 with the best MB adsorption capacity prepared exhibits thick mesoporous walls of 6.98 nm, pore size of 4.06 nm (BJH-adsorption branch), BET surface area of 364.71 m2/g with small micropore surface area of 42.29 m2/g. It was observed that the surface morphology of SBA-15 transformed from longer rods to shorter rods until a mixture of rods and spheres are present upon reducing HCl concentration from 2.5 M to 1.0 M. Upon increasing ageing temperature from 40 to 70°C, SBA-15 changed from short rods to thin-fibre like structure. Ageing time varied from 12 to 48 hours did not show any significant effect on morphological changes in SBA-15.
Contributor(s):
Koh Ming Hooi - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875006341
Barcode : 00003103478
Language:
English
Subject Keywords:
Effect of process parameters; physicochemical characteristics; soft-templating method
First presented to the public:
6/1/2016
Original Publication Date:
5/21/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 107
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-05-21 11:00:18.158
Date Last Updated
2019-01-07 11:24:32.9118
Submitter:
Mohd Jasnizam Mohd Salleh

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