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Study on Phosphate Removal from Aqueous Solution Using Fe-Mn-Zn Trimetal Oxide Modified Fly Ash


Affiliations
1 Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China
2 Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
 

In this work the adsorption of phosphate using the Fe-Mn-Zn trimetal oxide modified fly ash was studied. The experimental results showed that the absorbent could effectively remove phosphate in the pH range 4 to 9 and the maximum phosphate adsorption was at pH 8.0. Kinetic study showed that the phosphate adsorption was well described by pseudo-second-order model. The removal efficiency of phosphate increased with the increase of adsorbent dosage and the decrease of the initial concentration. The adsorption of phosphate could be well described by Langmuir isotherm, the Langmuir constant Q0 was 19.22mg/g. Comparative phosphate adsorption study of the untreated fly ash and the modified fly ash showed that modification with Fe-Mn-Zn trimetal oxide could significantly enhance the phosphate adsorption of the fly ash. The Fe-Mn-Zn trimetal oxide modified fly ash was a potential adsorbent for the removal of phosphate from aqueous systems.

Keywords

Adsorption, Fe-Mn-Zn Trimetal Oxide, Fly Ash Modification, Phosphate Removal.
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  • Study on Phosphate Removal from Aqueous Solution Using Fe-Mn-Zn Trimetal Oxide Modified Fly Ash

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Authors

Ke Xu
Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China
Tong Deng
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
Chunguang Li
Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China
Junling Niu
Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China
Juntan Liu
Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China
Weigong Peng
Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China

Abstract


In this work the adsorption of phosphate using the Fe-Mn-Zn trimetal oxide modified fly ash was studied. The experimental results showed that the absorbent could effectively remove phosphate in the pH range 4 to 9 and the maximum phosphate adsorption was at pH 8.0. Kinetic study showed that the phosphate adsorption was well described by pseudo-second-order model. The removal efficiency of phosphate increased with the increase of adsorbent dosage and the decrease of the initial concentration. The adsorption of phosphate could be well described by Langmuir isotherm, the Langmuir constant Q0 was 19.22mg/g. Comparative phosphate adsorption study of the untreated fly ash and the modified fly ash showed that modification with Fe-Mn-Zn trimetal oxide could significantly enhance the phosphate adsorption of the fly ash. The Fe-Mn-Zn trimetal oxide modified fly ash was a potential adsorbent for the removal of phosphate from aqueous systems.

Keywords


Adsorption, Fe-Mn-Zn Trimetal Oxide, Fly Ash Modification, Phosphate Removal.