Preparation of Melamine Cured Tannin Microspheres and its Adsorption Properties
In order to solve the problem of uranium containing wastewater caused by the development of nuclear energy,the myricetin tannin used in leather tanning was adopted as the main raw material,and was cross-linked with melamine by the Mannich reaction to form water-insoluble melamine cured tannin microspheres(MA-T)in this paper.The uranium adsorption properties of MA-T microspheres were investigated by batch adsorption experiments,and the adsorption thermodynamics and kinetics were disclosed.The adsorption mechanism was analyzed by SEM,FT-IR,particle size analysis and specific surface area analysis.The results showed that under the conditions of pH 5.8,dosage 0.01g,adsorption time 480 min and initial concentration 200 mg/L,the adsorption capacity of microspheres could reach 401 mg/g.The mechanism of adsorption of uranyl ions by MA-T microspheres is the coordination of the active site including-OH on the surface of the microspheres with uranium.
MyricetanninMelamine,Mannich reactionadsorptionuranyl ion
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