选择性氧化棉织物对茶多酚的吸附性能研究

Study on Adsorption Property of Selective Oxidized Cotton Fabrics on Tea Polyphenol

采用HNO_3-H_3PO_4-Na NO_2氧化体系对棉织物进行选择性氧化处理,再与茶多酚发生吸附作用得到茶多酚改性单羧基棉织物。通过试验表明选择性氧化可明显提高茶多酚在棉织物上的吸附量,且随氧化程度增加,氧化棉织物的羧基生成量与其对茶多酚吸尽率两者变化规律相似。采用单因素法得到茶多酚吸附改性单羧基棉织物的优化工艺参数:茶多酚浓度为8 g/L,处理温度60℃,处理时间60min。通过SEM分析表明,棉织物氧化后表面产生裂纹,而经茶多酚改性其表面变得较为平整。

Cotton fabrics were selectively oxidized by HNO3-H3PO4-NaNO2 system and followed byabsorption reaction with tea polyphenol, thus tea polyphenol modified monocarboxyl cotton fabric was prepared.The test results showed that selectively oxidation could remarkably improve the adsorption of tea polyphenol incotton fabrics. And with increase of the oxidation degree, the changes of the carboxyl content in oxidized cottonfabrics were similar to that of the adsorption rate of tea polyphenol in modified cotton fabrics. The optimal processparameters of tea polyphenol modified monocarboxyl cotton fabric were investigated through the single factor meth-od and were determined： 8 g/L of tea polyphenol at 60℃ for 60min. SEM analysis revealed that cracks on thesurface of cotton fabrics were formed after the oxidation while the surface of the modified cotton fabric becamesmoother after modification with tea polyphenols.