Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (3): 343-349.DOI: 10.11944/j.issn.1000-0518.2016.03.150243

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Adsorption Behavior and Mechanism of Pyrophosphate on Goethite

XIE Fazhiab*(),SHENG Dandana,HU Tingtinga,LI Haibina,WANG Xuechuna,XIE Zhiyonga   

  1. aSchool of Materials Science and Chemical Engineering
    bAnhui Key Laboratory of Advanced Building Materials,Anhui Jianzhu University,Hefei 230022,China
  • Received:2015-07-10 Accepted:2015-10-22 Published:2016-03-02 Online:2016-03-02
  • Contact: XIE Fazhi
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21107001), Excellent Young Talents Supportion Plan for University of Anhui Province(2014)

Abstract:

In order to study the fate and transport behavior of polyphosphate in water body, the adsorption process of pyrophosphate on synthetic goethite which stablely exists in the supergene environment has been studied systematically. The adsorption behaviors under different conditions(pH, electrolyte, time, temperature) were investigated and the adsorption mechanism was discussed. The results indicate that the adsorption capacity decreases from 3.00 mg/g to 0.75 mg/g with the increase of pH from 6.27 to 10.99. The lower the electrolyte concentration, the more favorable to the adsorption. The adsorption characteristic within 48 h was investigated. The adsorption capacity increases rapidly within 1 h, and then reaches the adsorption equilibrium. Moreover, the adsorption capacity increases with the increase of the adsorption temperature. Kinetic models and thermodynamic models were used to analyze the adsorption process, and the results show that the adsorption is in accord with the pseudo second-order equation and Langmuir model. Furthermore, combined with the characterization of materials, the adsorption may be mainly based on surface complexation and physical adsorption.

Key words: goethite, pyrophosphate, adsorption, kinetic, thermodynamic