Abstract
This work is an attempt to improve the selectivity and sensitivity response of zeolite Y towards 3 different types of ketone vapors (acetone, MEK and MIBK) which are known to be toxic and flammable substances. The effects of cation type, cation concentration, ketone vapor type, and cyclic interval were investigated. Three different cations were exchanged in zeolite Y at 50 % mole: NaY, 50KNaY, 50MgNaY and 50CaNaY for the zeolite Y at a fixed Si/Al ratio of 5.1. 50KNaY sample exhibits the highest electrical conductivity sensitivity. This arises from the electrostatic interaction between the cation and the zeolite framework, which affects the adsorption properties of zeolite. The dPPV was mixed with 80KNaY matrix at 10 % v/v and was exposed to 3 different ketone vapors. The highest electrical conductivity sensitivity belongs to the acetone exposure, whereas the MIBK exposure shows the lowest value, as a result of the smaller acetone size. The sensitivity of the composite is higher than that of pure zeolite Y by an order magnitude. For the cyclic interval, the electrical conductivity response decreases with increasing number of the interval due to the interaction between the active site and ketone vapors. The response of samples is irreversible as evidenced by FTIR.
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Acknowledgments
The authors would like to acknowledge the financial supports from the Conductive and Electroactive Polymers Research Unit of Chulalongkorn University, the Thailand Research Fund (TRF-BRG, TRF-RTA, PHD/0026/2553), and the Royal Thai Government.
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Kamonsawas, J., Sirivat, A. & Hormnirun, P. Poly(p-phenylene vilnylene)/zeolite Y composite as a ketone vapors sensor: effect of alkaline cation. J Polym Res 19, 20 (2012). https://doi.org/10.1007/s10965-012-0020-5
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DOI: https://doi.org/10.1007/s10965-012-0020-5