Citation:
GONG Wenpeng, KE xiaofen, LI Zhipeng, TIAN Chaoqiang, YANG Shuijin. Adsorption of Methylene Blue by Phosphomolybdiumtungstic Acid Decorated Metal Organic Framework MOF-5[J]. Chinese Journal of Applied Chemistry,
;2016, 33(9): 1047-1055.
doi:
10.11944/j.issn.1000-0518.2016.09.160058
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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.
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