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Volume 27 Issue 4
Jul 2016
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Mei Yu, Yanxin Wang, Shuqiong Kong, Evalde Mulindankaka, Yuan Fang, Ya Wu. Adsorption Kinetic Properties of As(Ⅲ) on Synthetic Nano Fe-Mn Binary Oxides. Journal of Earth Science, 2016, 27(4): 699-706. doi: 10.1007/s12583-016-0714-4
Citation: Mei Yu, Yanxin Wang, Shuqiong Kong, Evalde Mulindankaka, Yuan Fang, Ya Wu. Adsorption Kinetic Properties of As(Ⅲ) on Synthetic Nano Fe-Mn Binary Oxides. Journal of Earth Science, 2016, 27(4): 699-706. doi: 10.1007/s12583-016-0714-4

Adsorption Kinetic Properties of As(Ⅲ) on Synthetic Nano Fe-Mn Binary Oxides

doi: 10.1007/s12583-016-0714-4
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  • Corresponding author: Yanxin Wang, yx.wang@cug.edu.cn
  • Received Date: 04 Jun 2015
  • Accepted Date: 05 Dec 2015
  • Publish Date: 12 Jul 2016
  • The adsorptive removal of arsenic by synthetically-prepared nano Fe-Mn binary oxides (FM) was investigated. A novel method using potassium permanganate and ferric chloride as raw materials was used to synthesise FM. The molar ratio of Fe and Mn in the synthetic Fe-Mn binary oxides was 4 : 3. The FM-1 and FM-2 (prepared at different activation temperatures) having high specific surface areas (358.87 and 128.58 m2/g, respectively) were amorphous and of nano particle types. The amount of arsenic adsorbed on FM-1 was higher than that adsorbed on FM-2 particles. After adsorption by FM-1, residual arsenic concentration decreased to less than 10 μg/L. The adsorption kinetics data were analyzed using different kinetic models including pseudo first-order model, pseudo second-order model, Elovich model and intraparticle diffusion model. Pseudo second-order kinetic model was the most appropriate model to describe the adsorption kinetics. The adsorption percentage of As(Ⅲ) increased in the pH range of 2-3 while it decreased with the increase of pH (3 < pH < 10). The effects of coexisting anions on As(Ⅲ) removal using FM-1 and FM-2 were also studied and the order of the effects is as follows: NO3-, Cl-, F- < SO42-, HCO3- < H2PO4-, indicating that H2PO4- is the major competitor with As(Ⅲ) for adsorptive sites on the surface of the adsorbents. The higher adsorption capacity of FM-1 makes it potentially attractive adsorbent for the removal of As(Ⅲ) from groundwater.

     

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