Journal of Energetic Materials

In this study, the metal-organic framework imidazole-67 (ZIF-67) was used as an effective adsorbent for the preconcentration and separation of explosives. First, the metal-organic framework was synthesized and characterized by SEM, XRD, and FT-IR techniques. Subsequently, the synthesized compound was used as an adsorbent for the separation and preconcentration of nitroaromatic and nitramine explosives based on the solid phase extraction (SPE) technique. Finally, the explosive compounds were measured using high-performance liquid chromatography with UV detection (HPLC-UV). The parameters affecting the adsorption and desorption process, including pH, type of desorption solvents, contact time, adsorbent amount, and adsorption capacity, were investigated and the optimal values ​​were obtained for them. Under optimal conditions, the method is linear for the determination of TNT, 2,4-DNT, RDX and HMX in the range of 0.10-200, 0.5-200, 0.8-200 and 0.10-200 µg L^-1, respectively. Also, this technique was used for the extraction of solid phase explosives from water samples and satisfactory results were obtained. The relative recovery (RR) was in the range of 98-104% and the preconcentration factor was 10. Therefore, considering the advantages such as ease of preparation, high efficiency and reusability, the ZIF-67 structure was proposed as an excellent candidate for the adsorption and preconcentration of explosives.