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“三明治”双极膜的制备及其在降解含酚废水中的应用

, PP. 150-157

Keywords: “三明治”双极膜,壳聚糖,纳米Pt/TiO2,半导体光催化剂,苯酚

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Abstract:

纳米TiO2上负载纳米Pt以制备纳米Pt/TiO2半导体光催化剂,壳聚糖(CS)经纳米Pt/TiO2改性后作为阴膜层材料,以羧甲基纤维素(CMC)作为阳膜层材料,分别用戊二醛与FeCl3对阴、阳膜层进行交联改性,制备了CMC-Pt/TiO2-CS双极膜,并将该复合膜作为降解高浓度含酚废水电解槽的隔膜。结果表明:Pt/TiO2光催化剂可促进双极膜中间层水的解离,大大降低双极膜的膜阻抗和电阻电压降(IR降);同时,Pt/TiO2光催化剂表面生成的羟基自由基(·OH)可直接作用于苯酚,使其彻底降解成无机小分子;紫外光照下在16.7mA·cm-2的电流密度下电解高浓度含酚废水80min后,CMC-Pt/TiO2-CS双极膜的苯酚降解率比CMC-TiO2-CS双极膜的苯酚降解率高12.7%;整个电解过程CMC-Pt/TiO2-CS双极膜的膜电阻电压降保持在0.9V。

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