Chitosan was loaded on the surface of montmorillonite to prepare chitosan-modified montmorillonite and characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD)to explore the application of modified montmorillonite in decaffeinated tea beverages.Results showed that chitosan was not inserted between the montmorillonite layer, but was adsorbed on the surface of the montmorillonite by charge interaction to form a composite adsorbent. The more chitosan loaded by montmorillonite, the weaker the adsorption capacity for caffeine and the stronger the adsorption capacity for tea polyphenols. The mass ratio of 1∶0.01 (montmorillonite∶chitosan) was the best, at this ratio, the caffeine removal rate was about (96.01±1.8)% and the tea polyphenols retention rate was (84.52±1.01)%. In addition, compared with montmorillonite, chitosan-modified montmorillonite could significantly inhibit the dissolution of iron ions. Sensory evaluation showed that tea beverages had better color brightness, aroma, and overall taste, which were treated with chitosan-modified montmorillonite.
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