Abstract
The presence of phenolic substances in sugarcane juice seriously affects the color value of sugar products. Magnetic chitosan (MCS) was prepared using an ionic cross-linking technique, and then was modified with arginine to prepare arginine-modified magnetic chitosan (AMCS) for use as a new sucrose clarifying adsorbent. Gallic acid (GA) is a representative phenolic substance and was used to test the adsorption properties of the prepared AMCS. The adsorption kinetics indicated that the adsorption of GA on AMCS conformed to the pseudo-second-order model, the main adsorption mechanism was chemisorption. The Langmuir equation fit well and with good linearity, and indicated a maximum adsorption capacity of 48.38 mg g−1. The adsorption process was consistent with monolayer adsorption and spontaneous endothermic process. The prepared AMCS exhibited excellent regenerability, and can effectively remove GA in sugarcane juice to improve product safety.
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