Ozone direct electro-generation/activation peroxymonosulfate (PMS) for the degradation of bisphenol A using Ti/NATO anode

Abstract

In this study, Ni-doped Ti/SnO2-Sb anode (Ti/NATO) was prepared and used for electrocatalytic ozone production and in-situ activated peroxymonosulfate (E-Ti/NATO-PMS) to degrade bisphenol A (BPA). SEM, XRD and XPS results indicated that Ni doping could influence the transformations of Sb5+ and Sb3+ ions, which decreased the agglomeration of crystallites and increased the Oads and oxygen vacancy (Ov) concentrations. Ti/NATO1.0 anodes significantly improved the ozone production via outcompeting of the adsorbed O2ads over water, and inhibiting the desorption of O2ads, to obtain the highest O3 concentration with low onset potential and high oxygen evolution potential. E-Ti/NATO1.0-PMS system obtained over 92% BPA degradation within 60 min at 10 mA cm−2 and pH ranging from 4 to 10. Radical scavenging experiments revealed that O3in situ generated could directly electro-activate PMS into •O2− and 1O2. The E-Ti/NATO1.0-PMS process could detoxify the BPA through chain scission, rearrangement and ring opening processes, and exhibited great potentials for application.