Liquid|liquid electrochemical bicarbonate and carbonate capture facilitated by boronic acids

Abstract

Reversible bicarbonate and carbonate liquid|liquid ion transfer processes from aqueous solution into an organic 4-(3-phenylpropyl)pyridine phase are driven electrochemically with TPPMn(III/II) and shown to be facilitated over a wide pH range by 2-naphthylboronic acid (bicarbonate transfer potential −0.08 V vs.SCE; binding constant K_AB = 10² mol⁻¹ dm³ and carbonate dianion transfer potential 0.07 V vs.SCE; binding constant K_AB2 = 2 × 10¹⁰ mol⁻² dm⁶).