US 12,454,471 B1
Electrochemical device and method for simultaneous detection and recovery of metals ions from wastewater
Afzal Shah, Islamabad (PK); and Iltaf Shah, Al Ain (AE)
Assigned to UNITED ARAB EMIRATES UNIVERSITY, Al-Ain (AE)
Filed by United Arab Emirates University, Al Ain (AE)
Filed on Apr. 26, 2024, as Appl. No. 18/647,446.
Int. Cl. C02F 1/467 (2023.01); C02F 1/461 (2023.01); C02F 101/20 (2006.01)
CPC C02F 1/4678 (2013.01) [C02F 1/46109 (2013.01); C02F 2001/46119 (2013.01); C02F 2001/46138 (2013.01); C02F 2001/46152 (2013.01); C02F 2101/20 (2013.01); C02F 2201/4614 (2013.01); C02F 2209/06 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of detecting multiple co-existing metal ions from a solution sample, the method comprising:
placing a droplet of the solution sample on a working electrode surface;
drying the working electrode surface followed by applying a second droplet of a pH indicator solution on the working electrode surface, followed by performing an electroreduction step leading to conversion of the co-existing metal ions to corresponding metal atoms and deposition/electroplating of the metal atoms on the working electrode surface,
the working electrode comprising an amide derivative of benzoic acid (ADB) causing signals of metals oxidation to shift to lower potentials in comparison to signals obtained on a bare glassy carbon electrode, and enabling detection of the co-existing metal ions simultaneously at, above and below their permissible exposure levels (PELs),
wherein the multiple co-existing metal ions detected in the same voltammetric scan up to picomolar concentration are Zn(II), Tl(I), Cd(II), Pb(II), Ni(II), As(III), Cu(II), Hg(II), Fe(III), Sr(II), and Ce(III).