Patent ID: 9115463
Filing Date: 2015-08-25
Classification: B01J,C11D,D06L

Abstract:
1. A method of treating a substrate comprising the following step: contacting the substrate with an aqueous medium comprising at least 1% of water, from 1 to 1500 mM of hydrogen peroxide, and a preformed transition metal catalyst to form an oxidative medium; wherein the transition metal catalyst is a dinuclear Mn(II)Mn(II), Mn(II)Mn(III), Mn(III)Mn(III), Mn(III)Mn(IV) or Mn(IV)Mn(IV) transition metal catalyst having a ligand of formula (I): H, C wherein the oxidative medium has a pH in the range 11.2 to 12.8 and the concentration of the transition metal catalyst is in the range from 0.0005 to 0.08 microM.