Sorption Capacity of Polyampholytic Hydrogels with Respect to Dyes of Different Origins

Abstract

The authors study the sorption capacities of polyampholytic hydrogels synthesized by modifying polyacrylamide with ethylenediamine, 1,3-diaminopropane, and 1,4-diaminobutane with respect to dyes of different origins: Congo red, methyl orange, and methylene blue. It is found that having a strong electrolyte in the solution lowers the sorption capacity of polyampholyte hydrogels with respect to the dyes. It is shown that the sorption of the dyes is reliably described by the Langmuir and Freundlich models, and the process is of a physical nature.