Photoelectrocatalytic degradation of 4-chlorophenol and oxalic acid on titanium dioxide electrodes.
Photoelectrocatalytic degradation of 4-chlorophenol and oxalic acid on titanium dioxide electrodes.
复制标题
DOI：
10.1016/s0045-6535(02)00612-4
复制
发表时间：
2003-03
期刊：
影响因子：
8.8
通讯作者：
G. Waldner;M. Pourmodjib;R. Bauer;M. Neumann-Spallart
中科院分区：
文献类型：
--
作者：
G. Waldner;M. Pourmodjib;R. Bauer;M. Neumann-Spallart
将烷氧基前驱体自旋涂覆或浸渍涂覆在透明导电电极衬底上，并对金属钛进行热氧化，制备了具有光催化活性的tio2薄膜。利用该薄膜在近紫外（单色，365 nm）光照射下进行了草酸和4-氯酚（4-CP）的光电催化或光电电化学降解研究。通过多种方法监测降解情况。在草酸降解过程中，在中等起始浓度下，co2生成占总有机碳降解量的100%；对于4-CP的降解，由于氧化步骤（即中间体）数量较多，因此检测到的co2较少。在降解实验中，计算了入射光子到电流的转换效率、沟道降解和产物形成以及法拉第效率。发现量子产率和法拉第效率强烈依赖于浓度，草酸浓度最高时的最大值（量子产率）约为1。
Photocatalytically active thin TiO2films were produced by spin-coating or dip-coating an alkoxy precursor onto a transparent conducting electrode substrate and by thermal oxidation of titanium metal. The thin films were used to study the photoelectrocatalytic or photoelectrochemical degradation of oxalic acid and 4-chlorophenol (4-CP) under near UV (monochromatic, 365 nm) light irradiation. Degradation was monitored by a variety of methods. In the course of oxalic acid degradation, CO2formation accounted for up to 100% of the total organic carbon degradation for medium starting concentrations; for the degradation of 4-CP, less CO2was detected due to the higher number of oxidation steps, i.e. intermediates. Incident-photon-to-current conversion efficiency, educt degradation and product formation as well as Faradaic efficiencies were calculated for the degradation experiments. Quantum yields and Faradaic efficiencies were found to be strongly dependent on concentration, with maximum values (quantum yield) around 1 for the highest concentrations of oxalic acid.