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首页> 外文期刊>Journal of Polymers and the Environment >Oxidation of Chitosan in Solution by Photocatalysis and Product Characterization
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Oxidation of Chitosan in Solution by Photocatalysis and Product Characterization

机译：溶液中壳聚糖的光催化氧化及产物表征

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摘要

Chitosan (CS) was oxidized under mild conditions in solution via photocatalysis using a 45-W compact household fluorescent light source in the presence of an immobilized TiO2 film. The physicochemical properties of the original and oxidized CS solutions were characterized by ultraviolet-visible (UV-Vis) spectroscopy, C-13 nuclear magnetic resonance spectroscopy, differential scanning calorimetry, Fourier-transform infrared spectroscopy, elemental analysis, pH-potentiometric titration, and gel permeation chromatography. The results showed that CS was effectively oxidized within 4 h of irradiation as indicated by colour changes of the product with the appearance of a new UV-Vis absorption band at 337.7 nm. The results support the formation of carbonyl groups along with negligible change in the polymer chain structure of CS and/or chain scissioning effects. The photocatalysis reported herein is a convenient, feasible and environmentally friendly method for oxidation of natural biopolymers such as CS in solution.
机译：在固定的TiO2薄膜存在的条件下，使用45W紧凑型家用荧光光源在光催化条件下，通过光催化在溶液中将壳聚糖（CS）氧化。通过紫外可见光谱，C-13核磁共振光谱，差示扫描量热法，傅里叶变换红外光谱，元素分析，pH电位滴定和凝胶渗透色谱。结果表明，如产品颜色变化以及在337.7 nm处出现新的UV-Vis吸收带所示，CS在辐照后4小时内被有效氧化。结果支持羰基的形成以及CS的聚合物链结构的可忽略的变化和/或断链作用。本文报道的光催化是在溶液中氧化天然生物聚合物（如CS）的便捷，可行和环境友好的方法。

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