A luminescent metal organic framework with high sensitivity for detecting and removing copper ions from simulated biological fluids.

The crystal structure of Cd-MOF-74 was obtained for the first time that possesses high sensitivity for the detection of copper ions from water and simulated biological fluids based on changes in luminescent intensity. Furthermore, Cd-MOF-74 could selectively remove Cu ²⁺ from simulated biological fluids that contain Mg ²⁺ , Co ²⁺ , Zn ²⁺ , Fe ²⁺ , Ni ²⁺ , Na ⁺ , and K ⁺ . The adsorption capacity of this adsorbent for copper ions reached 189.5 mg g ^-1 and it quickly adsorbed copper ions within 10 minutes under 10 ppm Cu ²⁺ in the simulated biological system. XPS, PXRD, and gas adsorption measurements revealed that this high sensitivity and selectivity of Cd-MOF-74 resulted from the partial substitution of Cd ²⁺ by Cu ²⁺ in the framework. Although many MOF materials have been employed for sensor or selective adsorption of Cu ²⁺ , Cd-MOF-74 is the first example of MOFs showing both capabilities in simulated biological fluids, which represents a pioneering work that extends the applications of MOF materials in the biological field.