科研之友
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摘要
Three different Zeolites(3A, 4A and 5A) were used to investigatetheir adsorptivities to Mn(II) in aqueous solution through a preliminary experiment. The one with the best capability would be used in an orthogonal experiment to find out the most appropriate parameters. The Mn(II) loaded zeolite from best condition was put into soduim chloride water solution to get desorbed. X ray diffraction (XRD) was used to characterize the initial and loaded zeolites in order to research its absorption mechanism.
The experiment results showed that the three zeolites have various adsorptivities, with 4A ranking top, which exhibits most excellent performance for Mn(II) removal with reaction condition as follows: 4A zeolite 0.6g, water temperature 35 degrees C, oscillation frequency 115 rpm, contact time 30 min, when it has an adsorption rate of 97.89%. The desorption rate of loaded zeolite in 0.1M soduim chloride water solution for 24 hours is as high as 94.2%.XRD analysis shows ion exchange between Mn2+ in aqueous solution and Zeolite 4A.
