studyTheoretically, the sorbent which is CMSS-acid hydrogel has afinite capacity for the sorbate. The rate of sorption to the surfaceshould be proportional to two factors; concentration of metal ionsin aqueous solution and the area or the amount of bare surface. Theisotherm study implements the reaction equation that have beenexpressed and rearranged to form linear graph by Rahchamani,Mousavi, and Behzad (2011):Langmuir isotherm