Synthesis of core–shell structured zeolite-A@mesoporous silica composites for butyraldehyde adsorption

[Display omitted] •The mesoporous silica shells are constructed on two different sizes of zeolite A through a sol–gel process.•The butyraldehyde adsorption amount on the core–shell composite is about double that of pristine A.•The thickness of the mesoporous silica shells change with the particle si...

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Published in:Journal of colloid and interface science 2014-08, Vol.428 (428), p.251-256
Main Authors: Yu, Haijun, Lv, Yingying, Ma, Kuoyan, Wang, Changguo, Xue, Zhaoteng, Zhao, Yujuan, Deng, Yonghui, Dai, Ya, Zhao, Dongyuan
Format: Article
Language:English
Subjects:
Adsorption
Butyraldehyde
Chemistry
Colloidal state and disperse state
Core–shell
Exact sciences and technology
General and physical chemistry
Ion-exchange
Particle size
Porous materials
Surface physical chemistry
Zeolite
Zeolites: preparations and properties
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Summary:[Display omitted] •The mesoporous silica shells are constructed on two different sizes of zeolite A through a sol–gel process.•The butyraldehyde adsorption amount on the core–shell composite is about double that of pristine A.•The thickness of the mesoporous silica shells change with the particle size of zeolite A. A simple sol–gel process is followed to construct a thin layer of mesoporous silica shell core–shell structure on micrometer sized and nanometer sized zeolite A (micro-zeolite A@SiO2 and nano-zeolite A@SiO2 respectively). Further thickness of the silica shells has been tuned from 20 to 50nm while the zeolite A particle size changes from nanometer to micrometer. Pores of the silica shells arranged orderly on the crystal-faces of zeolite-A cores. Typically, adsorption amount of the butyraldehyde towards these core–shell composite materials is investigated well and is verified to be almost double than that of the pristine zeolite A. Interestingly the nano-zeolite A core containing core–shell composite absorbs maximum butyraldehyde (314mg/g) compared to the micro-zeolite A (266mg/g), even if the mesoporous shell thickness of the nano-zeolite A@SiO2 composites is less (20nm) than that of micro-zeolite A@SiO2 (50nm). Both of these values are significantly larger than the pristine zeolite A (nano-zeolite A; 151mg/g and micro-zeolite A; 146mg/g).
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2014.04.060