PVP functionalized NH₂-Ti-MOF fluorescence and colorimetric sensor for catechol

Catechol is an important fine chemical raw material, and is widely used in the production of chemicals. However, this compound has low degradability and high toxicity, and was highly susceptible to release into the environment during production and application, posing a potential threat to ecosystems and human health. Therefore, in this paper, a PVP-functionalized NH₂-Ti-MOF was synthesized using PVP as a shape-controlling agent, NH₂-BDC as an organic ligand, and TBOT as a metal source. A sensor for dual-mode detection of catechol was constructed based on the interaction between catechol and PVP-NH₂-Ti-MOF. When catechol was added to the probe solution, the fluorescence intensity at 428 nm was found to decrease based on the static quenching effect. At the same time, it was found that a new ultraviolet absorption peak appeared at 282 nm in the ultraviolet absorption spectrum, and the absorption peak intensity increased with the increase of catechol concentration, thus realizing the dual mode detection of catechol. Compared with the single-mode sensor, the dual-mode sensor is more accurate, fast and sensitive, which provides a new idea for the detection of catechol in water samples.