TNT Vapor Concentration Based on the Continuous and Compact LTA Zeolite Membranes†

doi:10.7503/cjcu20180211

Abstract

Abstract:

The continuous and compact LTA zeolite membranes were prepared on α-Al₂O₃ support via a rubbing-shaving seeding method and then further fabricated into a concentrator to concentrate 2,4,6-trinitrotoluene(TNT) vapor utilizing the kinetic radius difference between the gas and the pore size of molecular sieves. The diffusion limit enable the TNT vapor to be trapped in the confined space of concentrator, with a concentration factor of 31.8 evaluated under static and dynamic conditions. Such concentration method based on compact molecular sieve membranes is of great significance for the real-time and ultrasensitive detection of TNT vapor.

Key words: LTA Zeolite membrane, Gas concentrator, TNT explosive vapor

CLC Number:

O611

TrendMD:

GUO Yanan,GONG Miaomiao,DOU Xincun. TNT Vapor Concentration Based on the Continuous and Compact LTA Zeolite Membranes^†[J]. Chem. J. Chinese Universities, 2018, 39(12): 2637.

Figures/Tables 9

Fig.1 Process for the fabrication of continuous and compact LTA membrane on α-Al2O3 tube

Fig.2 Schematic diagram of gas concentrator(A), static diffusion(B) and dynamic concentration(C) for TNT vapor in the concentrator1. Air inlet; 2—4. silicone pad; 5. teflon cavity; 6. porous ceramic tube; 7. zeolite membrane; 8. vacuum pump.

Fig.3 XRD pattern(A) and SEM image(B) of LTA zeolite seeds

Fig.4 SEM images of α-Al2O3(A) and seeded support by dip-coating seed suspension(B), rubbing seed suspension with shaving(C) and rubbing seed past with shaving(D)

Fig.5 SEM images of zeolite membranes from the top view(A) and cross section view(B)

Fig.6 Representative GC/ECD chromatograms of TNT in the static diffusion without(A) and with(B) LTA membrane

Fig.7 Representative GC/ECD chromatograms(A) and relative concentration of TNT(B) in the dynamic concentrationa. Al2O3, 50 ℃, 500 mL; b. LTA, 50 ℃, 500 mL; c. LTA, 50 ℃, 250 mL; d. LTA, 20 ℃, 250 mL.

Fig.8 Response curves of the sensor responding to TNT vapor in preconcentrator without(A) and with(B) LTA membrane

Fig.9 Scheme 1 Schematic of LTA membrane based preconcentrator applied in TNT sensing

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