Adsorption of Phenolic Acids from Sucrose Solution on Chitosan Modified Zeolite
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Abstract:
In order to reduce the content of phenolic compounds in sugarcane juice, chitosan modified zeolite was prepared by coprecipitation method with chitosan and zeolite as raw materials. The changes of surface structure and group of zeolite before and after modification were studied, and the effects of time, pH and initial concentration of phenolic acid on adsorption of phenolic acid from sucrose solution by modified zeolite were investigated. The adsorption kinetic model and adsorption isotherm model were discussed. The results of SEM showed that the surface of the modified zeolite was more rough. The results of infrared spectrum showed that the group of the composite was changed after modification, and chitosan was successfully loaded on the zeolite. The results show that chitosan modification could improve the adsorption capacity of phenolic acid on zeolite. The optimal pH value of modified zeolite was 8.0 and the adsorption time was 600 min. The adsorption capacity of phenolic acid reached 33.41 mg/g. The increase of initial concentration of phenolic acid was beneficial to improve the adsorption effect. The adsorption process was agreed to the pseudo second order adsorption kinetic model and Langmuir isothermal adsorption model. Chitosan modified zeolite had a good adsorption effect on phenolic acid in sucrose solution and is a promising clarifying agent for sugar.
