College of Chemical Engineering and Materials Science, Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-Utilization, Tianjin University of Science and Technology, No.29, 13th Avenue, TEDA, Tianjin 300457, China.
College of Chemical Engineering and Materials Science, Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-Utilization, Tianjin University of Science and Technology, No.29, 13th Avenue, TEDA, Tianjin 300457, China.
Int J Biol Macromol. 2021 Jun 30;181:150-159. doi: 10.1016/j.ijbiomac.2021.03.157. Epub 2021 Mar 26.
Herein we report on a facile and green strategy for continuous production of chitosan-zinc oxide fibers and then compare their photodegradation performance against three organic dyes (i.e., methylene blue (MB), methyl orange (MO) and Rhodamine B, respectively) under different lights. Chitosan-zinc hydrogel fibers (CS/Zn) with different zinc loadings are obtained by direct mixing of chitosan and zinc acetate solutions using a double-syringe injection device. The as-prepared CS/Zn fibers are then immersed into glutaraldehyde (GA) and sodium hydroxide solutions, respectively, and dried at T = 50 °C. The resultant CS/ZnO/GA fibers of ca. 617 μm in diameter are characterized using X-ray diffraction (XRD), thermogravimetric analysis and field emission scanning electron microscope (FE-SEM). XRD and FE-SEM data confirm that the CS/ZnO/GA fibers consist of a large amount of hexagonal wurtzite ZnO nanorods up to 550 nm in length, and exhibit three-dimensional interconnected macroporous architecture. Photodegradation results clearly show that the CS/ZnO/GA fibers are effective for the removal of organic dyes upon UV irradiation and can be easily recovered and reused for at least 6 consecutive cycles. Unlike most reported CS/ZnO nanocomposites, the current CS/ZnO/GA fiber shows a higher adsorption of cationic MB rather than anionic MO, the mechanism of which is proposed.
我们在此报告了一种简便、绿色的策略，用于连续生产壳聚糖-氧化锌纤维，并在不同光源下比较它们对三种有机染料（分别为亚甲基蓝（MB）、甲基橙（MO）和罗丹明 B）的光降解性能。通过使用双注射器注射装置将壳聚糖和乙酸锌溶液直接混合，获得具有不同锌负载量的壳聚糖-锌水凝胶纤维（CS/Zn）。然后将制备的 CS/Zn 纤维分别浸入戊二醛（GA）和氢氧化钠溶液中，并在 T = 50°C 下干燥。所得的 CS/ZnO/GA 纤维直径约为 617μm，通过 X 射线衍射（XRD）、热重分析和场发射扫描电子显微镜（FE-SEM）进行了表征。XRD 和 FE-SEM 数据证实 CS/ZnO/GA 纤维由大量长达 550nm 的六方纤锌矿 ZnO 纳米棒组成，并呈现出三维相互连接的大孔结构。光降解结果清楚地表明，CS/ZnO/GA 纤维在紫外光照射下对有机染料具有高效去除能力，并且可以轻松回收并至少重复使用 6 次。与大多数报道的 CS/ZnO 纳米复合材料不同，当前的 CS/ZnO/GA 纤维对阳离子 MB 的吸附能力高于阴离子 MO，提出了其机制。
