Phase transformation of rice husk ash in the synthesis of NaY zeolite: effect of ageing in short crystalline duration

Rosman, Nurafiqah and Harun, Zawati and Wahab, Md Saidin and Hubadillah, Siti Khadijah and Aminudin, Nurul Nabilah (2014) Phase transformation of rice husk ash in the synthesis of NaY zeolite: effect of ageing in short crystalline duration. Australian Journal of Basic and Applied Sciences, 8 (15). pp. 152-159. ISSN 19918178

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Abstract

Rice husk became a major product of rice-processing industries. Combustion of rice husk (RH) in air produces residues identified as rice husk ash (RHA) with content in SiO2 that varies from 85-95% based on the burning conditions, the type of furnace and the rice variety. Emphasizing on sustainable consumerism waste, rice husk ash can be used an alternative way to replace the constituent of silica element in zeolite frameworks. RH silica was prepared by burnt at 700oC in 5 h. The zeolite gel was prepared in sodium form (NaY), hydrothermally synthesized using silica source from rice husk. The zeolite gel was prepared with the following batch composition: 3.4Na2O: Al2O3: 9.5 SiO2: 136H2O synthesized at various ageing time (8, 12, 24 h) in 12 and 24 h of crystallization reactions. The phase and morphology of the synthesis products were characterized using X-Ray Diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. XRD results indicated that phase transformation was occurred, wherein an amorphous phase of RHA has been transformed into crystalline phases. It was also showed that the ageing and crystallite duration affected the NaY zeolite crystallization process. As the crystallite reaction time is increased, the metastable phase was transformed into a more stable phase which is NaP zeolite. Presences of NaP zeolite obviously seen when prolonged of ageing duration up to 24h. Also, NaY zeolite product contained a mixture of NaA zeolite. This study also showed that the images of zeolite produced reflect on the XRD results attained. The optimum crystallization time for the synthesis of zeolite NaY with RHS in modified of simple and easy hydrothermal route was 8h of crystallite reaction with age of 8h.

Item Type:Article
Uncontrolled Keywords:rice husk ash; NaY zeolite; hydrothermal; ageing
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD785-812 Municipal refuse. Solid wastes
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Materials Engineering and Design
ID Code:8281
Deposited By:Normajihan Abd. Rahman
Deposited On:22 Aug 2016 16:05
Last Modified:22 Aug 2016 16:05

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