Removal of Methylene Blue Dye using Local Adsorbent Materials
Keywords:Activated carbon, Methylene blue, Low-cost adsorbent, Isotherm
The objective of this study is to compare methylene blue dye removal ability by 3 types of adsorbent materials including activated carbon, charcoal and bamboo charcoal. The effects of adsorbent dosage (0.5-2.0 g), contact time (0-120 min), initial methylene blue concentration (65-140 mg/g) and pH solution (3-9) were investigated. The adsorption isotherms were analyzed by using Langmuir and Freundlich equations. The experimental results found that the optimum adsorbent dosage and contact time of the low-cost adsorbents were 2 g and 90 min, respectively. The removal efficiencies of methylene blue by activated carbon, charcoal and bamboo charcoal were 75.48, 23.90 and 16.57 %, respectively. Adsorption data were fit to Langmuir isotherm model. The maximum adsorption capacities of activated carbon, charcoal and bamboo charcoal were 18.73, 5.18 and 0.81 mg/g, respectively. When considering the maximum adsorption capacity per adsorption surface area of each adsorbent material, it was found that the charcoal had the highest value followed by bamboo charcoal and activated carbon respectively. If considering the economic value charcoal is the cheapest. Therefore, charcoal was the suitable local absorbent material which can be used for methylene blue dye removal.
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