Surface Chemical Aspects of Coagulation, Deposition and Filtration Processes: Part 2. Solution and Applications of Surface Complexation Model for Reactions at Solid-Water Interfaces

Kim, Sung-Jae; Benefield, Larry D.

Environmental Engineering Research 1996;1(2): 117-129.

Sung-Jae Kim^†, and Larry D. Benefield

¹Department of Food Science, Fisheries College, Gyeongsang National University, Tongyeong, Gyeongnam, 650-160, Korea
²Department of Civil Engineering, Auburn University, Auburn, AL 36849, U.S.A.

Corresponding Author: Sung-Jae Kim ,

Received: March 14, 1996; Accepted: September 14, 1996.

ABSTRACT

surface complexation model enables directly calculating the potentials (or f potential) and charges for layers formed around the particles that are subject to various solution chemistries and surface properties. For a broad range of chemical conditions, ^-potentials at carboxylate and oxide surface-water interfaces were calculated by using the diffuse layer (DL) and triple layer (TL) surface complexation models. The DL and TL models accurately predict both the variations in carboxylate and oxide acid-base properties as a function of ionic strength and the effects of pH and ionic strength on specific adsorption. In this work, main fitting parameters are intrinsic equilibrium constants for both the DL and TL models, and additional fitting parameters for the TL model are inner and outer layer capacitances. The fitting process for the DL model was developing by decreasing the surface charge and increasing pK,!J!j while for the TL model it was developing by the surface charge neutralization by interaction with NaT in a fixed layer of ions. In the DL model sodium adsorption on the solid surface occurred symmetrical specific adsorption in which oA ( = -