Multilayer Adsorption of Rhodamine 6G onto Composite of Bentonite and Polybutadiene Rubber Modified with Phosphate and Phosphonate Groups

It is shown that the adsorption of Rhodamine 6G (Rh6G) onto a composite material obtained by oxidative chlorophosphorylation of polybutadiene rubber and bentonite with subsequent hydrolysis is satisfactory described with using the models containg at least three parameters. The need to use such multi –parametric models for description of Rh6G adsorption can be a sign of its multilayered adsorption on the adsorbent, as well as the cooperative effect. The high adsorption capacity of the composite towards Rh6G can be caused by its electrostatic binding with phosphate and phosphonate functional groups on the surface.