Chitosan can be produced from disposed of waste from seafood crustacean, mainly in shrimps and crabs. Therefore, the value-added applications of chitosan has been being initiated and developed. This study present the comparisons of adsorption capacity between
Red FGS and Methylen Blue dye leading to effectively remove hazardous dyes for water treatment. The equilibrium time of Red FGS adsorption is 3 , 3 and 3 hours for 30oC and 35oC and 40oC, respectively. While, The equilibrium time of Methylen Blue adsorption is 3 , 3 and 3 hours for 30oC, 35oC and 40oC, respectively. In addition, the theories of Langmuir and Freundlich isotherms show different types of adsorption. For Red FGS , the Langmuir isotherm model shows a better fit than Freundlich isotherms at 35oC and 40oC. Whereas, Freundlich isotherm is better than Langmuir in case of 30oC. The maximum adsorption capacities of Methylen Blue and Red FGS are 1.18 and 79.365 mg g-1, respectively. According to the result, it appears that chitosan can absorb Red FGS better than Mehtylen Blue. In addition, the kinetic data show that adsorption between chitosan and these two dyes follows the pseudo- second-order.