Aqueous Sulfur Sols

Part of the Topics in Current Chemistry book series (TOPCURRCHEM, volume 230)

Abstract

Sulfur sols are colloidal solutions of elemental sulfur or of sulfur-rich compounds. The particles in these solutions have diameters of 0.1–1.0 μm and consist either of S8 molecules (hydrophobic sulfur sols) or of chain-like sulfur compounds with hydrophilic end groups like sulfonate or functionalized organic groups (hydrophilic sulfur sols) . Both types of sols are stabilized by the negative charge of the particles which results in mutual repulsion. Therefore, cations and especially multivalent cations are able to precipitate the sol particles. While hydrophilic sulfur sols can be prepared with sulfur concentrations of up to 600 g l−1, hydrophobic sols are much more dilute (<0.1 g l−1). Sols of these types occur both in industrial desulfurization plants where sulfide is oxidized to elemental sulfur as well as in cultures of certain oxidizing sulfur bacteria .

Keywords

Hydrophilic sulfur Hydrophobic sol Polythionates Micelles Colloidal solution Stabilization Precipitation Coagulation 

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Authors and Affiliations

  1. 1.Institut für Chemie, Sekr. C2Technische Universität BerlinBerlinGermany

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