Adsorption of p-chlorophenol on cationic polymer/bentonite nanocomposite adsorption materials

The cationic polymer/bentonite nanocomposite adsorption materials were prepared by cationic polymer-epicholorohydrin-dimethylamine (EPI-DMA) and dimethyldlammonium (PDMDAAC) as intercalary reagents, respectively; then the adsorption performance for p-chlorophenol (p-CP) were discussed. The results indicated that the adsorption ability of cationic polymer/bentonites for p-CP increased with the increase of polymer contents and the length of polymer chains. The adsorption kinetics were well described by first-order kinetic model, Bangham kinetic model and intra-particle diffusion model; the adsorption isotherms were also modeled according to Langmuir and Freundlich adsorption isotherms. Increasing solution pH was propitious to adsorption process and the adsorption process was exothermic reaction and was presented by heat evolution physical sorption and organic partition.