Study of silver adsorption on montmorillonite

• Autor(a) principal: Praus,Petr
• Data de Publicação: 2008
• Outros Autores: Turicová,Martina, Valásková,Marta
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532008000300025
• topic: adsorption; intercalation; silver; montmorillonite; nanoparticles

In this study Ag+ adsorption on Na+-rich montmorillonite (MMT) type Wyoming was studied. Adsorption data were fitted with several common isotherms but the best regression parameters were obtained for Langmuir model. It indicates that Ag+ was adsorbed on the MMT surface forming a monolayer. By adsorption of small amounts of Ag+ enlargement of the specific surface area (SSA) of micro- (r = 0.4-0.5 nm) and mesopores (r = 1.5-3 nm) was found. Intercalation of Ag+ into MMT was observed using X-ray diffraction (XRD). With increasing concentration of the silver nitrate solutions the content of Ag+ in MMT increased and the layered MMT structure gradually collapsed and exfoliated. The MMT samples saturated with Ag+ were treated with the sodium borohydride solutions to produce Ag0. The mean size of the Ag0crystallites of L111 = 8.5(1) nm was estimated. The metal silver nanoparticles are assumed to be located at the layer surface and crystal edges of MMT.