Construction of Zr-Based Metal-Organic Framework Anchored Carboxymethyl Cellulose Aerogels for the Adsorption of Limonin and Naringin from Ponkan Mandarin (Citrus reticulata Blanco cv. Ponkan) Wine

An innovative strategy for the preparation of Zr-based metal-organic framework (MOF, UIO-67) anchored three-dimensional carboxymethyl cellulose (CMC) aerogels was developed as a flexible and efficient absorbent for the removal of the bitter compounds from ponkan wine. Field emission scanning electron microscopy (FESEM) was carried out to investigate the morphology and hierarchical structure of CMC and UIO-67/CMC aerogels. Results showed that UIO-67 was found to be uniformly distributed on CMC. UIO-67/CMC aerogels maintained the three-dimensional porous structure of CMC. The adsorption experiments showed that the adsorption equilibrium time of UIO-67/CMC aerogels was 10 min for limonin and 20 min for naringin with adsorption efficiency of 83% and 56%, respectively. The adsorption behaviors followed the pseudo-second-order kinetic and Langmuir isotherm models, indicating that the adsorption rate is governed by chemical adsorption and the adsorption process is single-layer adsorption. Treatment with UIO-67/CMC aerogels retained most of the flavor compounds in ponkan wine while improving its physicochemical properties.