The results also showed that the biosorption of metal ions by seashell powder took place in a monolayer and through chemisorption.
In the literature the isotherms data of Brilliant Red HE-3B reactive dye sorption onto shells of Rapana venosa gastropods particles was better described by the Langmuir model,
indicating the formation of monolayer coverage of the sorbate at the external surface of the sorbent