Study of silver adsorption on montmorillonite

Journal of the Brazilian Chemical Society

Petr Praus²  Martina Turicová²  Marta Valásková¹ 

[1] ,-Technical University of Ostrava Department of Analytical Chemistry and Material Testing Poruba,Czech Republic

关键词: adsorption;    intercalation;    silver;    montmorillonite;    nanoparticles;   

DOI  :  10.1590/S0103-50532008000300025

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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