College of Light Industry and Textile, Qiqihar University, Qiqihar, 161000, Heilongjiang, China.
Engineering Research Center for Hemp and Product in Cold Region of Ministry of Education, Qiqihar University, Qiqihar, 161006, China.
Sci Rep. 2022 Dec 23;12(1):22207. doi: 10.1038/s41598-022-25835-6.
The cellulose of carex meyeriana kunth (CMKC) was used as raw material, and the spinning solution was prepared by combining with polyacrylonitrile (PAN). The nano-cellulose fiber of carex meyeriana kunth (CMKN) was prepared by electrospinning. Used to remove methylene blue dye (MB) in aqueous solution. In the electrospinning experiment, the addition of CMKC was in the range of 5% ~ 25%, the feed rate of spinning parameters was set in the range of 0.2 ~ 1.0 mL/h, the distance from the needle tip to the collecting plate was in the range of 10 ~ 25 cm, and the voltage was changed in the range of 15 ~ 25 kV. The obtained CMKN was characterized by scanning electron microscope, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy. The MB removal rate was evaluated in the dye removal experiment, and the effects of CMKN on MB removal rate under the factors of CMKC dosage, temperature, shock time and MB initial concentration were discussed. The optimum process conditions were determined by response surface methodology. The results show that the prepared fibers are superfine fibers with nanometer diameter, and the spun nanofibers have smooth surface, high overall orientation and strong uniformity. The adsorption kinetics of prepared CMKN accords with quasi-second order model, and the adsorption isotherm accords with Langmuir model. The maximum dye removal rate of CMKN is 63.24%.
以菎草（Carex meyeriana Kunth）纤维素为原料，与聚丙烯腈（PAN）复合纺丝，制备出菎草纳米纤维素纤维（CMKN），并用于水溶液中亚甲基蓝（MB）染料的去除。在静电纺丝实验中，CMKC 的添加量在 5%25%范围内，纺丝参数的进料速率设置在 0.21.0 mL/h 范围内，针尖到收集板的距离在 1025 cm 范围内，电压在 1525 kV 范围内变化。通过扫描电子显微镜、X 射线衍射（XRD）和傅里叶变换红外光谱对所得 CMKN 进行了表征。在染料去除实验中评价了 MB 的去除率，并讨论了 CMKC 用量、温度、冲击时间和 MB 初始浓度等因素对 CMKN 去除 MB 率的影响。通过响应面法确定了最佳工艺条件。结果表明，所制备的纤维为纳米级超细纤维，表面光滑，整体取向度高，均匀性强。制备的 CMKN 的吸附动力学符合准二级动力学模型，吸附等温线符合朗缪尔模型。CMKN 的最大染料去除率为 63.24%。
