Study on Methylene Blue Dye Adsorption in Aqueous Solution by Heat-Treated Gnetum gnemon Shell Waste Particles as Low-Cost Adsorbent

In this present study, a low-cost adsorbent from Gnetum gnemon shell waste has been prepared for methylene blue adsorption from aqueous solution in a batch system. The adsorbent particles were obtained after heat treatment of Gnetum gnemon shell waste at variation temperatures of 250, 300, 350 and 400 degrees C. The optimum adsorption capacity of 14,37 mg/g and percentage removal of 95.80% were obtained at heat temperature of 300 degrees C. The effect of experimental condition such as contact time and pH on adsorption capacity of methylene blue were also investigated. The result showed that the optimum experimental conditions was acheived at pH 6 and contact time of 25 minutes. Adsorption of methylene blue dye by heat-treated Gnetum gnemon shell waste particles fitted the Langmuir isotherm adsorption model with a maximum absorption capacity (Qmaks) of 35.58 mg/g which suggested that heat-treated Gnetum gnemon shell waste particles is a good potential adsorbent for methylene blue removal.