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通过静电纺丝法制备聚酯(PET)纳米纤维膜,并运用尿素水热法在其表面原位生长水滑石(LDH)微晶层,得到PET@LDH纳米纤维膜。采用扫描电子显微镜、红外光谱仪、X-射线衍射仪和能谱仪等对PET@LDH纳米纤维膜进行表征。结果表明:水热反应8h,水滑石晶片良好生长在PET纳米纤维表面,成功制备出PET@LDH纳米纤维膜。运用电感耦合等离子体测试技术对PET@LDH纳米纤维膜的除铬效果进行了探究,结果表明:当Mg/Al摩尔比为2∶1,Cr(Ⅵ)溶液的pH=2~3时,此纳米纤维膜吸附10d时达到吸附平衡,对Cr(Ⅵ)的平衡吸附量为14mg/g,并且符合准二级动力学吸附方程。因此,PET@LDH纳米纤维膜是一种有效的去除水中Cr(Ⅵ)的吸附剂,对当前水环境的改善提供了一个可行的方法。
Polyester (PET) nanofibers were prepared by electrospinning method. Hydrotalcite (LDH) microcrystalline layer was grown in situ by urea hydrothermal method to obtain PET @ LDH nanofibers. PET @ LDH nanofiber membranes were characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction and energy dispersive spectroscopy. The results showed that the hydrotalcite wafer grew well on the surface of PET nanofiber after hydrothermal reaction for 8h, and the PET @ LDH nanofiber membrane was successfully prepared. The effect of chromium removal on PET @ LDH nanofibers was investigated by ICP-MS. The results showed that when the molar ratio of Mg / Al was 2:1 and the pH of Cr (Ⅵ) solution was 2 ~ 3, The adsorption equilibrium of the nanofiber membrane was reached at 10 days after adsorption, the equilibrium adsorption capacity of Cr (Ⅵ) was 14 mg / g, and it was in accordance with the quasi-second order kinetic adsorption equation. Therefore, the PET @ LDH nanofiber membrane is an effective adsorbent for the removal of Cr (VI) in water and provides a viable solution to the current water environment.