Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (9): 1047-1055.DOI: 10.11944/j.issn.1000-0518.2016.09.160058

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Adsorption of Methylene Blue by Phosphomolybdiumtungstic Acid Decorated Metal Organic Framework MOF-5

GONG Wenpenga,KE xiaofena,LI Zhipenga,TIAN Chaoqiangb,YANG Shuijinab*()   

  1. aHubei Collaborative Innovation Center for Rare Metal Chemistry,College of Chemistry and Chemical Engineering
    bCollege of Arts and Sciences,Hubei Normal University,Huangshi,Hubei 435002,China
  • Received:2016-02-02 Accepted:2016-04-20 Published:2016-08-23 Online:2016-08-23
  • Contact: YANG Shuijin
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21171053), Natural Science Foundation of Hubei Province(No.2014CFA131), Undergraduate Innovation Scientific Research Foundation of College of Arts and Sciences Hubei Normal University(No.201502)

Abstract:

The novel absorbent H6P2Mo15W3O62/MOF-5 was prepared by the hydrothermal synthesis method. The active component H6P2Mo15W3O62 was introduced during the synthesis of metal organic framework MOF-5. The adsorption property of the composites on methylene blue from water solution was investigated, and the effects of the experimental parameters including the temperature, the initial pH value and initial concentration of methylene blue solution were discussed. The results demonstrate that the lower temperature and lower initial pH value are more favorable for the adsorption methylene blue onto H6P2Mo15W3O62/MOF-5. The experiment data can be well described in the Langmuir equation and a pseudo-second-order kinetic model, and the maximum adsorption capacity of methylene blue is 401.6 mg/g. Thermodynamic parameters ΔG<0, ΔH<0 and ΔS>0 reveal that the adsorption process is spontaneous and exothermic. Furthermore, we also explored the adsorption properties of H6P2 Mo15W3O62/MOF-5 to methyl violet, malachite green, rhodamine B, methyl orange and other dyes. The results indicate that this new absorbent shows better adsorption performance towards cationic dyes.

Key words: phosphomolybdiumtungstic acid, metal organic frameworks, methylene blue, adsorption