| 纳米α-Fe2O3-TiO2改性海藻酸钠/壳聚糖双极膜制备与表征 |
| Preparation and Characterization of Bipolar Membrane Modified by Nano-α-Fe2O3-TiO2 |
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| 摘要: 在壳聚糖(CS)阴离子交换膜中添加纳米复合半导体材料α-Fe2O3-TiO2，制备了PVA-SA/α-Fe2O3-TiO2-CS双极膜(PVA：聚乙烯醇；SA：海藻酸钠)，并用扫描电镜、热重分析、电子万能试验机和接触角测定仪等对其进行了表征。研究结果表明，添加纳米α-Fe2O3-TiO2可提高双极膜的亲水性、热稳定性和机械性能。纳米α-Fe2O3-TiO2复合半导体材料较纳米α-Fe2O3或纳米TiO2单一半导体材料具有更强的光催化双极膜中间界面层水解离能力，在高压汞灯照射下能大大降低双极膜的膜阻抗和膜电阻压降 (IR降)。 |
| 关键词: 双极膜 光催化 水解离 纳米α-Fe2O3 纳米TiO2 |
| 基金项目: |
| Abstract: The nano-α-Fe2O3 and nano-TiO2 were added into chitosan(CS) anion layer to prepare the PVA-SA/α-Fe2O3-TiO2-CS (Here, PVA: polyvinyl alcohol; SA: sodium alginate) bipolar membrane(BPM), which was characterized using SEM, TGA, electric universal testing machine, contact angle measurer and so on. Experimental results showed that nano-α-Fe2O3-TiO2 had better photocatalytic property for water splitting in the interlayer of BPM than nano-α-Fe2O3 or nano-TiO2. Under the irradiation of high-pressure mercury lamps, the membrane impedance and IR drop of the BPM modified by nano-α-Fe2O3-TiO2 were evidently decreased. At a current density of 60 mA·cm-2, the cell voltage of PVA-SA/α-Fe2O3-TiO2-CS BPM decreased by 1.2 V. And the cell voltages of PVA-SA/α-Fe2O3-CS BPM and PVA-SA/TiO2-CS BPM were reduced by 0.2 V and 0.7 V, respectively. Moreover, the hydrophilicity, thermal stability and mechanical properties of the modified BPM were increased. |
| Keywords: bipolar membrane photocatalysis water splitting nano-α-Fe2O3 nano-TiO2 |
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| 全文下载次数: 1980 |
| 陈日耀,陈 震,陈 晓,郑 曦,孙 婷.纳米α-Fe2O3-TiO2改性海藻酸钠/壳聚糖双极膜制备与表征[J].无机化学学报,2010,26(10):1790-1795. |
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