How specific functional groups influence the adsorption of solvated ions and water at liquid/graphene oxide interfaces remains elusive. Here, using computation accompanied with experiment we show that OH and COOH exert a stronger influence on water adsorption properties than O and H functional groups. Proton dissociation is observed in COOH groups, and the resulting COO- anions especially stabilize Pb(II) through strong electrostatic interactions. This suggests that among functional groups under study, COOH offers the best Pb(II) adsorption capacity. In line with computation, experiments revealed that a substantial increase in Pb(II) adsorption occurs with increasing pH due to deprotonation of carboxyl acid groups to form carboxylate anions. Our findings have substantial implications for understanding and controlling the selective transport of water and ions through graphene oxide laminate membranes used in separations and desalination.

Adsorption of H<sub>2</sub>O and Pb(II) at graphene oxide/water interfaces: Role of functional groups

ACS Fall 2021

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Adsorption of H2O and Pb(II) at graphene oxide/water interfaces: Role of functional groups

Adsorption of H₂O and Pb(II) at graphene oxide/water interfaces: Role of functional groups