Effective biosorption of patulin from apple juice by cross-linked xanthated chitosan resin

• The xanthated modified chitosan resin was prepared for patulin removal.
• The highest patulin removal was obtained by xanthated modified chitosan resin.
• Pseudo-second order and Freundlich models were fitted to patulin adsorption.
• The –NH2, –OH and –SH groups of CXCR participated in the patulin adsorption process.

In this work, cross-linked xanthated chitosan resin (CXCR) was prepared by inverse suspension cross-linking method, using glutaraldehyde as cross-linking agent and carbon disulfide as modification agent. The biosorption of CXCR for patulin from apple juice was investigated. Batch adsorption experiments were performed to evaluate the effect of pH, temperature, contact time and initial concentration. The adsorption of CXCR for patulin was characterized by Fourier Transform Infrared Spectroscopy (FTIR). The results showed that the optimum adsorption conditions of CXCR for patulin was achieved at pH 4, 30 °C for 18 h. The adsorption data could be fitted with pseudo–second order kinetic model and Freundlich isotherm model. It indicated that CXCR is an appropriate adsorbent for the removal of patulin from apple juice.