Zur Struktur der Phasengrenze Metallo xid/Elektrolyt‐Potentialbildung und Ladungsbilanz

Abstract

Summary: Details of the formation of potentials a t a metal-oxide/H20 interphase are described.On the one hand the whole potential drop consists of one fixed (HELMHOLTZ layer) and two diffuse parts (space charge in the oxide phase and G o w layer in the electrolyte), on the other hand it is given as sum of free charges and dipols. Besides the PZC the charge distribution is determined above all by the pH value of the electrolyte under conditions without an external current. The following cases can be qualitatively distinguished in connection with the important pH22 oc =7 : > > PHelectrolyte 2 PHPZC 5 7.

Evaluation of the effects of shaking intensity on the process of methylene blue discoloration by metallic iron

“…As positively charged ions, MB should readily adsorb onto negatively charged surface. That is at pH > pH pzc ; pH pzc being the pH at the point of zero charge [33]. The used initial concentration was 12 mg L −1 (∼0.037 mM) MB and it was prepared by diluting a 1000 mg L −1 stock solution.…”