Electrocatalytic degradation of octadecylamine and 4-dodecylmorpholine by the Ti/SnO2-Sb/β-PbO2 anode at high salinity conditions: Activity and mechanism insights

•100% ODA and DMP was removed within 10 min and 120 min by Ti/SnO2-Sb/β-PbO2 anode.•Degradation involving indirect electrochemical oxidation mediated by free radicals.•Sulphate inhibits ODA and DMP degradation more than chloride salt.•The degradation process begins with nitrogen decomposition, resulting in NO3-.•The possible degradation path and mechanism were revealed.