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Tailoring the metal introduction sequence onto mesostructured silica nanoparticles framework: effect on physicochemical properties and photoactivity

Jusoh, Norela W. C. and Abdul Jalil, Aishah and Triwahyono, Sugeng and Mamat, Che Rozid (2015) Tailoring the metal introduction sequence onto mesostructured silica nanoparticles framework: effect on physicochemical properties and photoactivity. Applied Catalysis A-General, 492 . pp. 169-176. ISSN 0926-860X

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Official URL: http://dx.doi.org/10.1016/j.apcata.2014.12.046

Abstract

Cu with variable weight loading (1-5wt%) was introduced to 5wt% Zn mixed mesostructured silica nanoparticles (MSN) via an electrochemical method to synthesize CuO-ZnO/MSN (C-ZM) catalysts. The physicochemical properties of the catalysts were characterized by XRD, FTIR, XPS, N2 adsorption-desorption, ESR, and cyclic voltammetry. 3 wt% Cu and 5 wt% Zn were also introduced alternately to MSN (3C-ZM and Z-3CM) to study the metal introduction sequence effect on the properties and catalytic activity. The characterization data showed that an altered arrangement of the silica network was observed with a different structure, particularly in the numbers of SiOSi, SiOZn, and SiOCu bonds as well as oxygen vacancies. The catalytic activity regarding the photodecolorization of methyl orange (MO) was in the following order: 3C-ZM > 5C-ZM > Z-3CM > 1C-ZM. The higher numbers of SiOZn, oxygen vacancies, and the higher pore volume of the 3C-ZM catalyst seemeed to be the main factors behind its higher photoactivity compared to the other catalysts. Further optimization by response surface methodology (RSM) with a central composite design (CCD) model was performed for the decolorization of MO. RSM demonstrated that the experimental value (99.89%) was reasonably close to the predicted value (99.99%) with only 0.1% error for MO decolorization at pH 3.5 using 1.6 g L-1 catalyst with 4 wt% Cu loading.

Item Type:Article
Subjects:A General Works
ID Code:58881
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 12:07
Last Modified:20 Sep 2017 15:27

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