The pH-dependent surface charging and points of zero charge

Abstract

The points of zero charge (PZC) and isoelectric points (IEP) from the recent literature are discussed. This study is an update of the previous compilation [M. Kosmulski, Surface Charging and Points of Zero Charge, CRC, Boca Raton, FL, 2009] and of its previous update [J. Colloid Interface Sci. 337 (2009) 439]. In several recent publications, the terms PZC/IEP have been used outside their usual meaning. Only the PZC/IEP obtained according to the methods recommended by the present author are reported in this paper, and the other results are ignored. PZC/IEP of albite, sepiolite, and sericite, which have not been studied before, became available over the past 2 years.

Formation and properties of nanostructured colloidal manganese oxide particles obtained through the thermally controlled transformation of manganese carbonate precursor phase

“…The formation of surface charge at the manganese oxide surfaces/electrolyte solution interfaces is a result of a complex reaction of acid base hydroxyl groups at the manganese oxide surfaces with electrolyte solution ions. Accordingly, the differences in the IEP for the manganese oxides obtained in this study could also be interpreted in terms of their structural differences, the oxidation state and the coordination number of the manganese to oxygen at their mineral surfaces [32,34,39]. The electric charge formation at chemically and structurally different manganese oxides is governed by the oxidation state of the manganese ions and their coordination number to oxygen at their surfaces, which is directly related to the type of crystalline structure [39].…”

“…The literature abounds with studies of the surface-charge properties in various metal oxides based on electrokinetic measurements [32][33][34]. Although numerous studies have provided results on the electrokinetic properties of manganese oxides, they were mainly conducted on pyrolusite (MnO 2 ), the most stable and abundant manganese mineral phase [35][36][37].…”

Photodegradation of m-cresol by Zinc Oxide under Visible-light Irradiation

“…Increasing photodegradation% may be due to the increase in adsorption of m-cresol on the photocatalyst surface. Increasing adsorption may be due to a decline of the electrostatic repulsive forces and increased interaction between photocatalyst surface (pH zpc = 9) (Kosmulski, 2006) and m-cresol because with increasing pH the number of positive species (m-cresol-H + ) decreases. It has also been reported that in alkaline solution (pH 8-9),…”

Use of isoelectric point and pH to evaluate the synthesis of a nanotubular aluminosilicate

“…The isoelectric point is closely related to the particle's superficial composition and to its structure [1][2][3]. Charge measurements have been widely used to characterize different kinds of surfaces [4].…”