CAJ | 학술논문

采用溶胶-凝胶法制备了Fe3+掺杂TiO2光催化剂。分析表明，制备的Fe3+-TiO2为锐钛矿型，其禁带宽度低于TiO2。将 Fe3+-TiO2添加到聚乙烯醇-壳聚糖(PVA-CS)阴离子交换膜中，制备了 PVA-CMC/Fe3+-TiO2-PVA-CS 双极膜(BPM)，(CMC：羧甲基纤维素钠)。研究结果表明，Fe3+-TiO2较TiO2具有更强的光催化双极膜中间界面层水解离能力，在太阳光照射下能大大提高水解离效率，降低双极膜膜阻抗和跨膜电压降。当电流密度为60 mA·cm-2时， PVA-CMC/Fe3+-TiO2-PVA-CS 双极膜槽电压下降了0.8 V。此外，通过Fe3+-TiO2改性，CS膜亲水性和双极膜机械性能均获得提高。将改性后的双极膜用于分离模拟海水中一、二价阳离子，在太阳光照射下，K+离子和 Na+离子双极膜透过率较无光照时有明显提高，电渗析2 h，K+离子和Na+离子的透过率分别为90.31％和82.93％，而二价阳离子的透过率均小于1.0%。
채용용효-응효법제비료Fe3+참잡TiO2광최화제。분석표명，제비적Fe3+-TiO2위예태광형，기금대관도저우TiO2。장 Fe3+-TiO2첨가도취을희순-각취당(PVA-CS)음리자교환막중，제비료 PVA-CMC/Fe3+-TiO2-PVA-CS 쌍겁막(BPM)，(CMC：최갑기섬유소납)。연구결과표명，Fe3+-TiO2교TiO2구유경강적광최화쌍겁막중간계면층수해리능력，재태양광조사하능대대제고수해리효솔，강저쌍겁막막조항화과막전압강。당전류밀도위60 mA·cm-2시， PVA-CMC/Fe3+-TiO2-PVA-CS 쌍겁막조전압하강료0.8 V。차외，통과Fe3+-TiO2개성，CS막친수성화쌍겁막궤계성능균획득제고。장개성후적쌍겁막용우분리모의해수중일、이개양리자，재태양광조사하，K+리자화 Na+리자쌍겁막투과솔교무광조시유명현제고，전삼석2 h，K+리자화Na+리자적투과솔분별위90.31％화82.93％，이이개양리자적투과솔균소우1.0%。
A Fe3+-doped TiO2 photocatalyst was prepared through a sol-gel method. X-ray diffraction (XRD) analysis indicates that the prepared Fe3+-TiO2 is in anatase phase and the band gap of Fe3+-TiO2 is smaller than that of TiO2. Moreover, the prepared Fe3+-TiO2 was added into polyvinyl alcohol-chitosan (PVA-CS) anion exchange membrane to prepare PVA-CMC/Fe3+-TiO2-PVA-CS bipolar membrane (BPM), (here, CMC:carboxymethyl cellulose). Experimental results show that Fe3+-TiO2 exhibits better photocatalytic performance for water splitting at the interlayer than that of TiO2. The water splitting efficiency of PVA-CMC/Fe3+-TiO2-PVA-CS BPM is improved under sunlight irradiation, and the membrane impedance and trans-membrane voltage drop are obviously decreased. At current density of 60 mA?cm-2, the cell voltage of a PVA-CMC/Fe3+-TiO2-PVA-CS BPM-equipped cell decreases by 0.8 V. Moreover, the hydrophilicity of the CS membrane and the mechanical properties of the BPM are increased after Fe3+-TiO2 modification. The PVA-CMC/Fe3+-TiO2-PVA-CS BPM was applied to separate monovalent and divalent cations in simulation seawater. The penetration rates of K+and Na+ions through BPM are increased under sunlight irradiation. When electrodialysis time is 2 h, the penetration rates of K+and Na+ions are 90.31%and 82.93%respectively, and the penetration rates of the divalent cations are all smaller than 1%.