采用磷酸对纳米纤维素进行改性,然后将磷酸化纳米纤维素与聚丁二酸丁二醇-共-对苯二甲酸丁二醇酯(PBST)混合制成铸膜液,最后采用雾化辅助非溶剂诱导相分离方法制得可生物降解PBST/磷酸化纳米纤维素复合膜。通过X射线能谱仪、衰减全反射傅里叶变换红外光谱仪、扫描电子显微镜对磷酸化纳米纤维素的元素含量、化学结构及复合膜的表面形貌进行分析表征,并研究了复合膜对Cr(Ⅵ)的吸附性能。结果表明:磷酸基团被修饰到纳米纤维素中;当磷酸化纳米纤维素含量为2%(质量分数)时,复合膜对Cr(Ⅵ)吸附量达到最大,为38.3mg/g;整个吸附过程遵循准二级动力学模型和Langmuir等温吸附模型。
In this work,nanocellulose was modified with phosphoric acid,and then phosphorylated nanocellulose was mixed with poly (butylene succinate-butylene terephthalate) ester (PBST) to form a casting solution.Finally,a biodegradable PBST/phosphorylated nanocellulose composite membrane was prepared using atomization-assisted non-solvent induced phase separation (AA-NIPS) method.The elemental content and chemical structure of the phosphorylated nanocellulose and the surface morphology of the composite membrane were analyzed and characterized using EDS,FT-IR,and SEM.The adsorption performance of the composite membrane for Cr(Ⅵ) was also studied.The results showed that the phosphate groups were modified into the nanocellulose.When the content of phosphorylated nanocellulose was 2% (mass fraction),the maximum adsorption of Cr(Ⅵ) by the composite membrane reached 38.3mg/g.The entire adsorption process followed the quasi-second-order kinetic model and the Langmuir adsorption isotherm.
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