三明治式双极膜的制备及其光催化性能

Preparation of Sandwich Bipolar Membrane and Its Photocatalytic Properties

以Cr3+交联羧甲基纤维素钠(CMC)作为阳膜层,戊二醛改性壳聚糖(CS)作为阴膜层,纳米TiO2光催化剂作为双极膜的中间层,在TiO2上涂布光敏剂八羟基喹啉(Oxine)以增强其光催化解离水的性能,制备了三明治式的双极膜(mCMC/TiO2-Oxine/mCSBPM)。该双极膜在紫外光照射下,具有高的水解离效率,优良的亲水性能,双极膜阻抗小,工作电压低,当工作电流密度达0.12A/cm2时,电槽工作电压小于5.0V。

The mCMC/TiO2-Oxine/mCS bipolar membrane（BPM） was prepared by using carboxymethyl cellulose（CMC） as the anodic layer,chitosan（CS） as the cathodic layer,and Cr3＋ and glutaraldehyde as the linking reagents.Nano-TiO2 was taken as an interlayer.The BPM showed a sandwich composition.TiO2 was modified with the photosensitizer,oxine as a photocatalyst to enhance the photocatalytic properties for splitting the water in the interlayer of the BPM.The bipolar membrane exhibited an excellent hydrophilic performance,lower impedance and working voltage.When the working current density was as high as 0.12 A/cm2,the working voltage was as low as 5.0 V with UV irradiation.