Diffuse sorption modeling: Ionic adsorption on silica.
The Poisson-Boltzmann equation was applied to simulation of published data on adsorption of bivalent metal ions on silica. The surface charge of silica was approximated with the basic Stern model (without coordinate binding of sodium ions). It was found that the adsorption of alkaline-earth metal ions is closely consistent with the Poisson-Boltzmann equation; i.e., it may be completely explained by electrostatic attraction in the diffuse layer. Adsorption in the diffuse layer was also found important for some heavy metals, such as cadmium.
Pivovarov
Sergey
S
Institute of Experimental Mineralogy RAS, 142432 Chernogolovka, Moscow District, Russia. serg@iem.ac.ru
D000327:Adsorption; D002104:Cadmium / Q000737:chemistry*; D004058:Diffusion; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D008673:Metals, Alkaline Earth / Q000737:chemistry*; D008956:Models, Chemical; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
D007477:Ions; D008673:Metals, Alkaline Earth; D002104:Cadmium; D012822:Silicon Dioxide