关键词: 砖茶, 氟, 磷酸钙, 吸附

Abstract: [Objective] The experiment was conducted to study the effects of tricalcium phosphate on adsorption and removal of fluorine in brick tea soup. [Method] The adsorption equilibrium and adsorption kinetics were used in this study. [Results] Under the experimental conditions, fluorine adsorbed by tricalcium phosphate was well described by the Langmuir model. The adsorption capacity increased with rising temperature. The adsorption capacity was highest(10.627 mg/g) under the 70℃. Moreover, the adsorption kinetic of fluorine adsorption was also described by the pseudo-second-order rate model. 30%-50% of fluorine in the tea soup adsorbed by tricalcium phosphate during the process of boiling and the adsorption effect could be ignored when adding NaCl in the tea soup. However, the adsorption capacity was significantly lowered under the condition of alkaline. Meanwhile, there were a small changes in physical and chemical quality after adsorption and the sensory quality was still the brick tea flavor. [Conclusion] The tricalcium phosphate can be utilized to remove fluorine in brick tea soup.

Key words: brick tea, fluorine, tricalcium phosphate, adsorption