engleski

Sorption of methylene blue onto orange and lemon peel

This study examines the sorption of methylene blue on the cheap unconventional biosorbents, citrus fruits: oranges and lemons. Wastes are used: peel, seeds and pulp. The results are compared with results of sorption to mineral sorbents zeolite clinoptilolite, Pyrolox and Birm. Sorption kinetics and the influence of pH on the sorption of methylene blue on orange and lemon peel is examined. There were determined sorption isotherms on orange and lemon peel, and the zeolite. Experimental test data of sorption kinetics were analyzed using two kinetic models: the model of pseudo-first-order and pseudo-second-order. Model pseudo-second- order better described the kinetics of sorption of methylene blue on orange and lemon peel. When the pH of the solution dyes is 2-3, the sorption of methylene blue was slightly weaker than at pH 3-6. In the studied concentration range 50-1000 mg/dm3 sorption of methylene blue on orange and lemon peel is a linear, with sorption efficiency of approximately 100%. The capacity of zeolite for methylene blue is 20 mg/g. Sorption capacity of citrus waste is significantly higher than in the mineral sorbent (zeolite, Pyrolox, Birm).

bio sorbents ; orange and lemon peel ; methylene blue ; sorption isotherms ; kinetics

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