【作者】 陈强；

【导师】 陈震；

【作者基本信息】 福建师范大学 ， 环境工程， 2011， 硕士

【摘要】 苯酚废水毒性大,难以被生物降解,降解苯酚废水的研究倍受关注。本研究以TiO2-葸醌改性双极膜中间层。将其用作为电解槽隔膜,光助电氧化降解苯酚。利用双极膜技术,在紫外灯照情况下,于显碱性的阳极室中,利用阳极发生的特殊氧化反应可以形成羟基自由基(·OH),继而羟基自由基降解苯酚为CO2和H2O,或将其转换成可生化降解的中间产物,实现对苯酚进行降解。减少双极膜的阻抗,提高水解离效率是当今双极膜研究的焦点。为此本文在双极膜的中间层中涂布纳米尺寸的光催化剂TiO2和光敏剂葸醌(Anthraquinone,缩写为Anth),制得三明治式的双极膜。测定了双极膜的膜的离子交换能力、溶胀度、OH-渗透性、I-V工作曲线；并用扫描电镜(SEM)观察双极膜界面层形态；用电化学工作站测试膜交流阻抗,并在实验室双极膜电解槽中,对制得的膜的性能进行了综合电化学性能的测试。实验结果表明,在紫外光照射下,以TiO2-Anth修饰的双极膜表现出更高的水解离效率及氢离子和氢氧根离子的渗透率,阻抗减小,工作电压将低等特点。当工作电流密度达125 mA·cm-2时,电槽工作电压小于5.0V。通过测定降解过程中苯酚溶液的紫外-可见分光光度和高效液相色谱的变化研究了苯酚的降解机理。电镜扫描、膜阻抗测定、渗透性测定等分析测定结果表明,TiO2-葸醌改性双极膜在提高膜性能,降低膜阻抗,减少能源消耗等方面效果良好,紫外光照180min,苯酚降解为CO2和H2O。更多还原

【Abstract】 Phenolic water was unique difficult degrading by the bacteria treatment. The degradation of phenolic water was paid more and more attention. In this paper, TiO2-anthraquinone was used to modify the intermediate layer of a bipolar membrane (BPM), which was equiped in a cell for the elevctro-catalytic degradation of the phenolic water.The usage of the membrane technology, under the ultraviolet light, in the alkali anode chamber, the hydroxyl radical(·OH) was formed by the most special reaction to achieve the deep degradation. The phenol was degraded to CO2 and H2O or converted into a biochemical degradation of the production by this hydroxyl radical.How to promote water splitting at the intermediate layer and lower the IR drop of bipolar membrane (BPM) is the focus of BPM research. In the interlayer of bipolar membrane modified with nanometer-sized TiO2 as a photo-catalyst and the anthraquinone (abbreviated as Anth) as a photosensitizer. SEM and electrochemical workstation were used to characterize the BPMs.Ⅰ-Ⅴcurve, ion exchange capacity, swelling degree, changes of pH in anode were investigated. Experimental results showed that the sandwich-type BPM exhibited a several good properties:a higher efficiency for the water splitting in the interlayer, and a higher operation current density, lower impedance and working voltage. When the working current density is at 125 mA·cm-2, the working voltage is as low as 5.0 V under the UV illumination.The degradation process of phenol solution was measurmented by UV-visible spectrophotometry and high performance liquid chromatography. The mechanism of its degradation was discussed. The TiO2-anthraquinone modified bipolar membrane was investigated by SEM, electrochemical workstation and OH- permeability. Experimental results showed that the modified BPM enhanced membrane performance, and reduced membrane resistance and the energy consumption. In conditions of UV irradiation for 180min, the phenol was degraded to CO2 and H2O.更多还原