Removal of methylene blue（MB） from aqueous solution by a new polyoxometalate-based metal-organicframework composite（POM@MOF） was systematically explored in batch tests. The chemical structure and surfaceproperties of the composite were characterized by means of FTIR, XRD, EDS, N2 adsorption-desorption isothermsand zeta potential measurements. The results showed that MB adsorption onto H6P2Mo15W3062@Cu3（BTC）2 highlydepended on initial solution pH, which was mainly related to the electrostatic attraction between negatively chargedcomposite surface and positively charged MB molecules. Thus, the improved adsorption performance ofH6P2Mo15W3062@Cu3（BTC）2 can be attributed to the modification of H6P2Mo15W3O62 resulting in its higher electro-negative charge than Cu3（BTC）2. The thermodynamic parameters indicated that the adsorption was spontaneous andexothermic process. The isotherm obtained fitted the Langmuir model and the maximum adsorption capacity of thecomposite at 30℃ was 77.22 mg/g. All the results illustrated that H6P2Mo15W3062@Cu3（BTC）2 composite can effec-tively and selectively remove cationic organic pollutants, represented by MB, implying the promising application ofdesigning, a novel adsorbent oolvoxometalate-based metal-organic frameworks in treatment of dye wastewater.
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