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首页> 外文期刊>Journal of Applied Polymer Science >ZnO nanocrystallites/cellulose hybrid nanofibers fabricated by electrospinning and solvothermal techniques and their photocatalytic activity
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ZnO nanocrystallites/cellulose hybrid nanofibers fabricated by electrospinning and solvothermal techniques and their photocatalytic activity

机译：静电纺丝和溶剂热技术制备的ZnO纳米微晶/纤维素杂化纳米纤维及其光催化活性

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摘要

ZnO nanocrystallites have been in situ embedded in cellulose nanofibers by a novel method that combines electrospinning and solvothermal techniques. Zn(OAc)_2/cellulose acetate (CA) precursor hybrid nanofibers with diameter in the range of 160-330 nm were first fabricated via the electrospinning technique using zinc acetate as precursor, CA as the carrier, and dimethylformamide (DMF)/acetone(2:1) mixture as cosolvent. The precursor nanofibers were transformed into ZnO/cellulose hybrid fibers by hydrolysis in 0.1 mol/L NaOH aqueous solution. Subsequently, these hybrid fibers were further solvothermally treated in 180°C glycerol oil bath to improve the crystallite structure of the ZnO nanoparticles containing in the nanofibers. The structure and morphology of nanofibers were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. It was found that hexagonal structured ZnO nanocrystallites with the size of ～ 30 nm were dispersed on the nanofiber surfaces and within the nanofibers with diameter of about 80 nm. The photocatalytic property of the ZnO/cellulose hybrid nanofibers toward Rhodamine (RhB) was tested under the irradiation of visible light. As a catalyst, it inherits not only the photocatalytic ability of nano-ZnO, but also the thermal stability, good mechanical property, and solvent-resistibility of cellulose nanofibers. The key advantages of this hybrid nanofiber over neat ZnO nanoparticles are its elasticity, dimensional stability, durability, and easy recyclability.
机译：ZnO纳米微晶已通过结合电纺丝和溶剂热技术的新方法原位嵌入纤维素纳米纤维中。首先通过静电纺丝技术，以乙酸锌为前驱体，CA为载体，二甲基甲酰胺（DMF）/丙酮（Zn（OAc）_2 /乙酸纤维素（CA）前体杂化纳米纤维）制成直径在160-330 nm的纳米纤维。 2：1）混合物作为助溶剂。通过在0.1 mol / L NaOH水溶液中水解，将前体纳米纤维转化为ZnO /纤维素杂化纤维。随后，将这些杂化纤维在180°C的甘油油浴中进一步进行溶剂热处理，以改善纳米纤维中所含ZnO纳米粒子的微晶结构。纳米纤维的结构和形貌通过扫描电子显微镜，透射电子显微镜和X射线衍射进行表征。结果发现，尺寸约为30 nm的六角形ZnO纳米微晶分散在纳米纤维表面和直径约80 nm的纳米纤维内。在可见光照射下测试了ZnO /纤维素杂化纳米纤维对罗丹明（RhB）的光催化性能。作为催化剂，它不仅继承了纳米ZnO的光催化能力，而且还继承了纤维素纳米纤维的热稳定性，良好的机械性能和耐溶剂性。这种杂化纳米纤维相对于纯ZnO纳米颗粒的关键优势是其弹性，尺寸稳定性，耐用性和易回收性。

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