EFFECT OF THE ZETA-POTENTIAL ON ELECTRON-TRANSFER TO COLLOIDAL IRON-OXIDES

摘要: The reaction rate between charged, reducing radicals and highly colloidal oxide particles is shown to be strongly dependent on the {zeta} potential of particles. An equation developed which incorporates influence electric field present around oxides both mass-transfer-limited activation-controlled electron-transfer reactions at colloid surface. It that appreciable kinetic effects are possible under typical experimental conditions. By use a Stern model for oxide-water interface, an inner layer capacitance 400 {plus minus} 30 {mu}F cm{sup {minus}2} iron obtained.