科研之友
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摘要
The adsorption of methylene blue on activated carbon derived from brewer's yeast was systematically investigated in this study. Activated carbon prepared by chemical activation with Na2CO3 (weight ratio of Na2CO3/yeast was 2:1) at 700 degrees C for 2 h, presenting high BET surface (957.7 m(2)/g) and large pore volume (0.81 mL/g), was more effective for methylene blue removal than those prepared under other conditions. 88% of the uptake of methylene blue by this activated carbon occurred in 2.0 h, and the equilibrium was obtained within 3.0 h, which was well described by pseudo second order kinetics. The methylene blue adsorption on activated carbon decreased as the solution pH was increased from 3.0 to 4.0 and then increased obviously as the pH was further increased, which was caused by the pH dependent surface charge of activated carbon. The adsorption isotherm was better described by the Freundlich isotherm than the Langmuir isotherm. The maximum methylene blue uptake was estimated to be 407.78 mg/g. Fourier transform infrared spectroscopy studies showed that carbonyl and amine groups in activated carbon were involved in the adsorption of methylene blue.
