Preparation of Spherical Porous Magnesium Silicate and Its Application in Decolorization of Sugar Juice

Objective:To study the preparation of spherical porous magnesium silicate and its application in decolorization of sugar juice. Methods:The porous magnesium silicate was prepared by hydrothermal synthesis method and template method with magnesium chloride and silica gel as precursors. XRD,FTIR and SEM were used to characterize the porous magnesium silicates. The effects of spherical porous magnesium silicate,adsorption temperature,adsorption time and pH value on decolorization performance of raw sugar solution were investigated by using spherical porous magnesium silicate as sorbent,taking raw sugar solution as research object and decolorization rate index. The adsorption process of porous magnesium silicate on sugar pigment was investigated. Results:The characterization results showed the spherical porous magnesium silicates was obtained. The results of decoloration showed that when the dosage was 0.10 g,the adsorption temperature was 30 ℃,the adsorption time was 40 min,and the pH value was 6.0,the decoloring rate of the juice was 69.8%. Under the experiment conditions the adsorption of sugar cane juice on spherical porous magnesium silicate follows quasi-secondary kinetic equation and Langmuir isothermal adsorption equation. Conclusions:The results can provide new methods and theoretical basis for the development of the sugar production technology and process use magnesium.