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Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (7): 189-195.doi: 10.11924/j.issn.1000-6850.2014-2214

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Study on Adsorption and Desorption of Cr (Ⅵ) in Synthetic Zeolite

  

  • Received:2014-08-13 Revised:2015-03-02 Accepted:2015-01-23 Online:2015-04-03 Published:2015-04-03

Abstract: The adsorption and desorption experiments of Cr(Ⅵ) from aqueous solution using the synthetic zeolite were conducted regarding the study on the adsorption and desorption mechanism of Cr(Ⅵ) from aqueous solutions. The results indicated that the solution pH showed great effect on synthetic zeolite adsorbing Cr(Ⅵ). And, the adsorption percentage of Cr(VI) increased with a decrease of solution pH and initial concentration. Nevertheless, the adsorption capacity increased with an increase of the initial concentration. The adsorption behavior showed more correspondents to Freundlich model than the Langmuir model. The adsorption capacity on the synthetic zeolite concentration reached 3.58, 6.76, 8.08 mg/g respectively under the initial concentration conditions of 25.0, 50.0, 100.0 mg/L. The pseudo second-order kinetic model was better than the pseudo first-order kinetic model to describe the behavior of the synthetic zeolite adsorbing Cr(Ⅵ), the adsorption capacity of pseudo second-order kinetic differed by less than 5.8%, the adsorption mass transfer process mainly was controlled by the proliferating in the fluid film and inside the grains. In distilled water the E% of Cr (Ⅵ) is only 2.57%. After the addition of NaOH, the desorption percentage increased significantly. The desorption of Cr (VI) in the synthetic zeolite was conformed to pseudo second-order kinetic.