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Vetiver grass is a tropical plant which has a deep thick root system, spreading vertically. The root densely binds together likely an underground wall enabling it to store water and moisture. Application of the vetiver grass is considered as an effective measure for soil and water conservation. However, the use of vetiver leaves is limited and it becomes an agricultural waste. In this study, the vetiver leaves were used as a raw material to synthesize an adsorbent for wastewater treatment by using a simple method. The leaves were calcined at various temperatures of 200, 400, 600, 800 and 1,000°C to increase a porosity of the adsorbent. The adsorption efficiency was investigated by using methylene blue solution. The results reveal that the highest adsorption efficiency of 91% was found in the adsorbent calcined at 200°C with adsorption capacity at 27.4 mg/g. In addition, the adsorption mechanism was described by Langmuir isotherm and pseudo-second order of kinetic model.
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