Copper Ion Fluorescent Probe Based on Zr-MOFs Composite Material.

In this work, a novel and effective ratio fluorescent porphyrin metal-organic framework (MOF) probe by encapsulating UiO-66(OH) into the porphyrin MOF (PCN-224) was prepared, showing the excellent fluorescence performance in detecting Cu. In this probe, the signal from the green-emission UiO-66(OH) encapsulated in PCN-224 was deemed as an effective reference, thus affording an effective built-in correction in complex environmental effects. The red-emission PCN-224 contained the active site for detecting Cu. At the same time, Cu can selectively quench the fluorescence intensity of PCN-224. The ratiometric probe therefore gave an effective and reliable Cu determination platform with an LOD value as low as 0.068 nM. This LOD result was better than the Cu concentration limitation in drinking water regulated by World Health Organization (WHO) and reported by some other methods. This provides a simple new sensor for rapidly detecting copper ions, which can be further expanded in various environmental and biological analysis tasks.