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Abstract

The present research includes a comparative study of preparing mesoporous silica using two different methods: the chemical method and the green method. The sol-gel method was used using sodium silicate (glass water) as a cheap source of silica and the cationic-type surfactant (Hydroxylethyl, 2-Hydroxylcetyl (2-Dimethyl ammonium chloride) in the chemical method, and Zyziphus Spina Christi (Sider tree) tree leaf extract in the green method, as a soft template. The mesoporous silica prepared using the two methods were compared by characterizing them using different methods: measuring surface area by BET method and porosity by BJH, XRD, SAXRD, AFM, FTIR, SEM, and EDX. The results showed that the silica prepared by the green method had the best surface area, recording 800 m2g-1 and an average pore diameter equal to 2.5 nm, while XRD measurements showed that both methods produced non-crystalline (amorphous) silica, while SAXRD showed that the green method produced more regular silica. SEM images displayed gr-SiO2 particles were comparatively smaller than the particles of ch--SiO2 with spherical shape particles and agglomeration as a flower shape, while EDX results confirmed the presence of Si and O, with small amount of C which may be due to non-complete decomposition of surfactants. The Langmuir, Freundlich, and Temkin isotherm models were fitted to the data obtained from the experiments and the results of adsorption study shows that the chemical prepared silica has higher capacity (63.694 mg g-1) toward amlodipine adsorption according to Freundlich parameters obtained by linear fitting.

Keywords

Amlodipine, Cationic surfactant, Mesoporous silica, Soft template, Zyziphus Spina leaves Christi

Subject Area

Chemistry

Article Type

Article

First Page

813

Last Page

821

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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