Cu-BTC/PVDF杂化膜的原位掺杂制备及增强的染料吸附性能

Preparation of Cu-BTC/PVDF Hybrid Membranes Using in situ Doping Method and Their Enhanced Dye Adsorption Properties

将Cu-BTC颗粒与聚偏氟乙烯(PVDF)溶液共混,原位掺杂制备了Cu-BTC/PVDF杂化膜,利用扫描电子显微镜(SEM)、X射线衍射仪、热重分析仪和傅里叶变换红外光谱仪等对杂化膜的结构进行了表征,并对杂化膜的亲/疏水性质、膜孔隙率以及膜水通量进行了测定,探讨了Cu-BTC的掺杂量对杂化膜结构和性质的影响.结果表明,Cu-BTC的存在使PVDF薄膜的成核机理发生改变,降低了PVDF膜孔尺寸,提高了膜表面亲水性和水通量.在对刚果红(CR)的吸附实验中,Cu-BTC/PVDF杂化膜表现出显著增强的吸附活性,且随着Cu-BTC掺杂量的增加,Cu-BTC/PVDF对CR的吸附性能逐渐增强.吸附热动力学拟合结果表明,吸附过程以Langmuir单分子层吸附和化学吸附为主要特征.

Cu-BTC/PVDF Hybrid membranes were fabricated through blending the Cu-BTC particles and poly（ vinylidenefluoride）（ PVDF） casting solution and the followed lyotropic phase transition process. Scanning electron microscopy（ SEM）,X-ray diffraction（ XRD）,thermogravimetric analysis（ TG） and Fourier transform infrared spectroscopy（ FTIR） were used to characterize these hybrid membranes, and the hydrophilic/hydrophobic properties,membrane porosity and membrane water flux were also measured. The effects of doping amount of Cu-BTC on the structure and properties of the hybrid membranes were discussed in detail. The results showed that in the presence of Cu-BTC particles,the nucleation mechanism of PVDF was changed to heterogeneous nucleation,and as a result,the pore size of PVDF membranes was reduced,the hydrophilicity and water flux of the hybrid membranes were improved evidently compared with pristine PVDF films. In the adsorption experiments of Congo red（ CR）,all the Cu-BTC/PVDF hybrid membranes presented significant enhanced adsorption activity,and with the increase of the doping amount of Cu-BTC,the adsorption properties of Cu-BTC/PVDF hybrid membranes were enhanced gradually. The adsorption thermal dynamics analyses indicated that the adsorption process is mainly characterized by Langmuir monolayer adsorption and chemical adsorption.