Sonication Enhanced Removal of Nickel and Cobalt Ions from Polluted Water Using an Iron Based Sorbent

Table 1

Standard reduction potentials at 25°C [31].

Element	Half-cell reaction	𝐸^0 (V)
Iron (Fe)	Fe^2+ + 2e^−→ Fe	−0.44
Nickel (Ni)	Ni^2+ + 2e^−→ Ni	−0.23
Cobalt (Co)	Co^2+ + 2e^−→ Co	−0.28