	US 12,135,281 B2
	Method of detecting mercury ions with a fluorescein hydrazide-appended metal-organic framework as a chemosensor
Aasif Helal, Dhahran (SA); Muhammed Naeem, Dhahran (SA); Mohammed Fettouhi, Dhahran (SA); and Md. Hasan Zahir, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jun. 14, 2022, as Appl. No. 17/840,045.
Prior Publication US 2023/0400409 A1, Dec. 14, 2023
Int. Cl. G01N 21/35 (2014.01); G01N 21/3577 (2014.01); G01N 21/17 (2006.01)

CPC G01N 21/3577 (2013.01) [G01N 2021/174 (2013.01)]

17 Claims

1. A method of detecting Hg²⁺ions in an aqueous solution, comprising:

contacting the aqueous solution with a metal-organic framework (MOF) chemosensor composite to form a mixture; and

monitoring a change in an absorption and/or a fluorescence profile of the MOF chemosensor composite in the mixture to determine a presence or absence of Hg²⁺ions in the aqueous solution;

wherein the MOF chemosensor composite, comprises:

fluorescein hydrazide (FH); and

a MOF, comprising:

nickel as a metal ion; and

at least one trimesic acid (BTC) ligand;

wherein a hydrazide group on the FH coordinates to the metal ion of the MOF.