ZIF-8/改性聚丙烯腈电纺纳米纤维的制备及其高效去除水中孔雀石绿

Preparation of zeolitic imidazolate frameworks⁃8/modified polyacrylonitrile electrospun nanofibers for efficient removal of malachite green from water

通过原位生长方法,将最常见的金属有机骨架(MOFs)——沸石咪唑酯骨架材料(ZIF-8)固定到羧甲基化聚丙烯腈静电纺丝纳米纤维(PAN-COOH NFs)表面,得到ZIF-8/PAN-COOH NFs。通过扫描电子显微镜(SEM)、能量色散光谱(EDS)、X射线粉末衍射(XRD)和傅里叶变换红外光谱(FTIR)对合成的ZIF-8/PAN-COOH NFs形貌和结构进行表征,并深入研究ZIF-8/PAN-COOH NFs从废水中去除孔雀石绿(MG)的性能。研究发现:ZIF-8/PAN-COOH NFs对MG的吸附符合拟二级动力学方程,吸附过程可采用Langmuir等温线模型拟合,其对MG的最大吸附容量可达3604 mg·g^(-1)。此外,ZIF-8/PAN-COOH NFs在染料吸附实验中表现出良好的分离功能和重复利用性。

A simple in‑situ growth method was presented to synthesize zeolitic imidazolate framework‑8(ZIF‑8),one of the most common metal‑organic frameworks(MOFs)crystals,onto a carboxymethylated polyacrylonitrile electrospun nanofibers(PAN‑COOH NFs).The synthesized ZIF‑8/PAN‑COOH NFs were characterized by field‑emission scanning electron microscope(SEM),energy dispersive spectroscopy(EDS),X‑ray powder diffraction(XRD),and Fourier‑transform infrared(FTIR)spectroscopy.The characterization results confirmed that the ZIF‑8 particles were successfully loaded on the surface of the PAN‑COOH NFs.The ability of ZIF‑8/PAN‑COOH NFs to remove malachite green(MG),a model organic dye,from wastewater was evaluated to examine the potential of this novel material as an adsorbent.The adsorption to MG was consistent with the pseudo‑second‑order kinetic equation,and the adsorption process was expressed by the Langmuir isotherm model.The maximum adsorption capacity for MG was examined as 3604 mg·g^(-1).It is noteworthy that the ZIF‑8/PAN‑COOH NFs could be easily separated from the dye solution and regenerated through a simple washing process for recycling.