Desempenho de estruturas metal-orgânicas como sensores de sulfeto de hidrogênio

Abstract

Advances in research on materials for toxic gas detection are of utmost importance to ensure safe environments and prevent industrial and environmental accidents. One such gas is hydrogen sulfide (H₂S), known for its high toxicity. In this context, metal-organic frameworks (MOFs) have emerged as promising materials for sensor fabrication due to their unique properties, such as high porosity and specific surface area. In this study, different MOF structures were synthesized and investigated for their H₂S sensing capability, comparing them in terms of colorimetric response. To achieve this, the MOFs were characterized using various techniques, including scanning electron microscopy (SEM), X-ray diffraction (XRD), and N₂ physisorption. The materials were compared based on their performance as H₂S sensors, evaluating the chemical composition and colorimetric aspects of the samples after gas exposure. MOFs composed of various metal ions, such as Cu, Zn, Al, Co, Ni, and Zr, were assessed, with emphasis on their structural and chemical properties for gas sensing applications. Copper-based MOFs (HKUST-1 and CuBDC) proved to be the most effective in detecting H₂S, confirming their potential as colorimetric sensors. In addition to identifying the structure with the highest sensing capacity for hydrogen sulfide, this study provided valuable insights into the structural and textural properties of the MOFs. The observed changes in chemical composition and colorimetric characteristics reinforce the utility of MOFs for toxic gas detection and highlight the importance of optimizing their properties for industrial applications.