Study on the adsorption properties of nano-calcium carbonate surface modified zeolite to phenolic acid in simulated cane juice

Abstract

Objective: This study aimed to explore the adsorption performance and mechanism of phenolic acids in simulated sugarcane juice by nano-calcium carbonate modified zeolite (CaCO3@ZL). Methods: Using zeolite as the supporting framework, a co-precipitation technique was utilized to create nano-calcium carbonate modified zeolite (CaCO3@ZL), which was then employed to simulate the adsorption of phenolic acids in sugarcane juice. Using X-ray diffraction (XRD) and infrared spectroscopy (FTIR), the zeolite's characteristics were examined both before and after alteration. The kinetic model fitting of CaCO3@ZL and static adsorption studies were also conducted. The properties of phenolic acids were studied during adsorption. Results: XRD and FTIR characterization results indicate that the modification process successfully prepared nano-calcium carbonate loaded on the surface of zeolite CaCO3@ZL. Comparing the adsorption test results of CaCO3@ZL to those of the unmodified ZL, the adsorption capacity of phenolic acids increased by 40.34%, with adsorption equilibrium at 600 minutes. The fitting results showed that the adsorption process followed the Freundlich isotherm adsorption model and quasi-second-order adsorption kinetics model. After 5 regenerations CaCO3@ZL still maintains 80.39% of the initial adsorption amount of phenolic acid. Conclusion: The adsorption process rate of CaCO3@ZL on simulated sugarcane juice is mainly controlled by multi-molecular layer adsorption and chemical adsorption. CaCO3@ZL has good regeneration performance and can be used for the removal of phenolic acids in sugarcane juice.

Keywords

• zeolite
• nano calcium carbonate
• coprecipitation
• adsorption
• phenolic acid
• sugarcane juice