Metal ion detection by luminescent metal organic frameworks

Metal Organic Frameworks(MOFs) have been used in various applications, including

sensors. The unique crystalline structure of MOFs in addition to controllability of

their pore size and their intake selectivity makes them a promising method of detection.

Detection of metal ions in water using a binary mixture of luminescent MOFs

has been reported. 3 MOFs(ZrPDA, UiO-66 and UiO-66-NH2) as detectors and 4

metal ions(Pb2+, Ni2+, Ba2+ and Cu2+) as the target species were chosen based on

cost, water stability, application and end goals.

It is possible to detect metal ions such as Pb2+ at concentrations at low as 0.005

molar using MOFs. Also, based on the luminescence responses, a method of distinguishing

between similar metal ions has been proposed. It is shown that using a

mixture of MOFs with dierent reaction to metal ions can lead to unique and specic

3D luminescence maps, which can be used to identify the present metal ions in water

and their amount.

In addition to the response of a single MOF to addition of a single metal ion,

luminescence response of ZrPDA + UiO-66 mixture to increasing concentration of

each of 4 metal ions was studied, and summarized. A new peak is observed in the

mixture, that did not exist before, and it is proposed that this peak requires metal

ions to activate